September might be London's best-kept secret among the shoulder months. Schools go back in the first week, and the city shifts almost overnight — the tourist crowds thin out, restaurant tables in Soho open up without three-week-ahead bookings, and the cultural calendar switches into a higher gear. Temperatures hover around 20°C (68°F) during the day, dropping to about 12°C (54°F) at night, which tends to mean jacket weather by evening and shirtsleeves at lunch when the sun comes out. The rain does pick up from August's relatively dry 40mm to around 77mm spread across a dozen or so wet days, though these are usually passing showers you can wait out in a pub rather than the all-day grey of November.
This is when London's institutions really come alive for autumn. The BBC Proms wrap up in spectacular fashion at the Royal Albert Hall, Open House London throws open the doors of hundreds of normally private buildings for a single weekend, and galleries from Mayfair to Shoreditch launch their autumn exhibitions. Borough Market fills with English game birds, wild mushrooms, and damsons. The parks still feel green, though they're starting to turn at the edges — that particular lower September light that photographers love.
To be fair, you are trading reliable sunshine for noticeably shorter days. By month's end, sunset drops to around 6:45pm from the roughly 7:30pm you'd have caught in early September. And that 77mm of rain is real — you will get caught in at least one shower. But if you'd rather explore a city at a comfortable 20°C than shiver at 7°C in January or fight July's peak crowds at 23°C, September tends to land in a genuinely sweet spot.
Why visit in September
- Summer crowds disperse almost overnight once schools return in the first week — major museums and galleries are comfortably busy rather than shoulder-to-shoulder, and same-day West End tickets become realistic again
- The cultural calendar shifts into high gear: the Proms finale at the Royal Albert Hall, Open House London's free access to hundreds of private buildings, London Design Festival installations across the city, and autumn exhibition launches at major galleries
- Weather sits in a comfortable range for walking — 20°C (68°F) highs mean you can spend full days on foot without the draining July heat or the January chill that drives you indoors every hour
- Shoulder-season pricing kicks in by mid-September, with hotel rates dropping noticeably from the July–August peak while the quality of things to do arguably increases
- British seasonal produce peaks — native oyster season opens, game birds arrive on gastropub menus, wild mushrooms and blackberries fill the market stalls at Borough Market and farmers' markets across the city
Worth knowing
- Rain picks up sharply from August's 40mm to 77mm across about 12 wet days — you will encounter showers, and an afternoon plan that depends on dry weather needs a backup
- Daylight contracts noticeably across the month: early September sunset is around 7:30pm, but by month's end it's closer to 6:45pm, which cuts into evening outdoor time
- Water temperatures in outdoor spots like the Hampstead Heath ponds and the Serpentine are dropping — by late September, swimming requires genuine commitment rather than casual enjoyment
- Some popular restaurants and shops that close for August holidays reopen on staggered schedules, so you might find the occasional favourite still shuttered in the first week
Best for
Think twice if
September marks London's transition from summer warmth to autumn cool. Early in the month can still deliver proper warm afternoons that feel like late summer, but by the final week there's a genuine chill in the mornings and the light takes on a lower, golden quality. Daytime highs average 20.2°C (68°F), comfortable for long walks in a light layer. Nights cool to about 12.2°C (54°F) — enough that you'll want a jacket if you're out past dark, and you might see your breath on a clear late-September morning. Rainfall averages 77mm across roughly 12 wet days, a noticeable jump from August's 40mm, though the showers tend to be intermittent rather than daylong affairs. Humidity sits around 78%, which registers as a slight dampness in the air rather than anything oppressive. Worth noting: the sunshine you do get feels different from July's — warmer in tone, lower in angle, and shorter in duration.
Year-round climate
Averages from the last 5 years.
| Month | Avg high (°C) | Avg low (°C) | Rainfall (mm) |
|---|---|---|---|
| Jan | 7 | 2 | 69 |
| Feb | 10 | 3 | 54 |
| Mar | 12 | 4 | 54 |
| Apr | 14 | 5 | 39 |
| May | 18 | 9 | 63 |
| Jun | 22 | 12 | 53 |
| Jul | 23 | 14 | 70 |
| Aug | 23 | 14 | 40 |
| Sep | 20 | 12 | 77 |
| Oct | 16 | 10 | 87 |
| Nov | 11 | 6 | 76 |
| Dec | 9 | 5 | 63 |
Headline events
Open House London
Mid-September weekend, usually the second or third weekend
Over 800 normally private buildings — from private residences and corporate headquarters to government buildings and architectural studios — open their doors to the public for free across a single weekend. People plan London trips specifically around this. The ballot-entry buildings (places like the Foreign, Commonwealth and Development Office, or private houses by notable architects) fill up weeks in advance, but hundreds of walk-in sites remain accessible on the day. The scale is hard to overstate: you can walk through a Brutalist council estate in the morning, a Georgian townhouse at lunch, and a contemporary Stirling Prize winner by afternoon.
Last Night of the Proms
Second Saturday of September
The finale of the BBC's eight-week summer classical music season at the Royal Albert Hall — part concert, part national singalong, part cultural event that transcends classical music. The atmosphere inside the hall is unlike any other night in the season: standing Prommers waving flags, the crowd singing along to 'Land of Hope and Glory' and 'Jerusalem,' streamers and confetti. There's usually a large outdoor screening in Hyde Park as well. Tickets for the Last Night itself are allocated by ballot to people who've attended other Proms concerts, but returns sometimes appear close to the date, and the park screening is open to all.
London Design Festival
Mid to late September, roughly nine days
A city-wide celebration of design that spreads across hundreds of venues — from the V&A's central hub to pop-up installations in Shoreditch warehouses, Clerkenwell showrooms, and Bankside galleries. The festival commissions large-scale installations that tend to stop you in your tracks: past years have seen mirror mazes in the V&A courtyard and giant kinetic sculptures on the South Bank. It runs for about nine days and pulls in architects, furniture designers, graphic designers, and anyone who cares about how things are made and shaped.
Best things to do in September
Explore Open House London ballot and walk-in buildings
cultureSpend a full weekend walking through buildings that are normally locked to the public. The walk-in sites alone could fill two days — Victorian pump stations, Art Deco cinemas, Modernist housing estates, livery company halls in the City. Each building typically has volunteers who know the history and can point out details you'd miss on your own. The smell of old stone and polished wood in a Georgian townhouse is hard to replicate anywhere else.
Open House London happens once a year, always in September — there's no other opportunity to access these spacesBooking tipBallot-entry buildings require advance registration weeks ahead; check the Open House website when registration opens in late August
Catch the Proms finale atmosphere at the Royal Albert Hall or Hyde Park
cultureEven if you don't have a ticket to the Last Night itself, the energy around the Royal Albert Hall on that Saturday is worth experiencing. The Hyde Park screening draws thousands who picnic on the grass while the concert plays on large screens, and the Kensington neighbourhood hums with pre-concert buzz. If classical music isn't your thing, the atmosphere alone — somewhere between a festival and a village fête — is genuinely fun.
The Last Night of the Proms is a fixed September date; the outdoor screening is weather-dependent but September usually cooperatesBooking tipLast Night tickets go through a ballot system for Proms attendees; the Hyde Park screening is free but arrive early for a decent spot
Walk the Thames Path in early autumn light
outdoorsThe lower September sun turns the Thames into something worth photographing — golden light bouncing off the water, long shadows from the bridges, and a clarity in the air that July's haze doesn't allow. The stretch from Westminster to Tower Bridge is the classic, but the less-walked section east from Greenwich toward the Thames Barrier has its own quiet beauty: industrial heritage, wide skies, and the occasional heron standing in the shallows.
September's lower sun angle creates warmer, more directional light that peaks during golden hour — something the high summer sun can't matchBrowse autumn exhibition openings across the gallery circuit
cultureLondon's commercial galleries and major institutions stagger their autumn openings through September. The Mayfair galleries along Cork Street and Dover Street tend to open on Thursday evenings — you can walk between a dozen shows in an hour, often with a glass of wine. The South Bank and Bankside cluster (Tate Modern, Hayward Gallery, White Cube Bermondsey) launches its autumn programme around the same time. The feeling of walking into a freshly hung show, the faint smell of new paint, is one of the pleasures of the London autumn.
September is when galleries reset after summer — the autumn programme launches are concentrated in this month more than any otherForage for blackberries along the canal towpaths
outdoorsThe Regent's Canal from Little Venice to Victoria Park, the Lee Navigation towpath, and the paths around Hampstead Heath are all thick with blackberry bushes in September. The berries are fat, dark, and free. Mind you, the ones at head height tend to be picked clean — the best fruit is usually just below knee level or tucked behind nettles. Bring a container and watch for thorns.
Wild blackberries peak in the first three weeks of September; by October they're past their best and starting to go mushyVisit Borough Market for seasonal game and mushrooms
foodBorough Market shifts gear in September. The summer stone fruit and salad greens give way to game birds hanging in the butchers' stalls, wild mushrooms piled in wooden crates, and English apples in varieties you've never seen in a supermarket. The smell changes too — from the bright sweetness of summer to something earthier, richer. Saturday mornings are busy but worth it; weekday lunchtimes are calmer.
September is the crossover month when late-summer and early-autumn produce overlap — the widest variety of seasonal British ingredients you'll find all yearBooking tipNo booking needed, but Saturday before 10am gives you the widest selection before the lunch crowds arrive
Attend London Design Festival installations at the V&A and across the city
cultureThe V&A serves as the central hub, but the festival's installations spread across the city — Shoreditch, Clerkenwell, Brompton, Bankside. The commissioned pieces tend to be interactive and visually striking, designed to make you stop and look twice. Past installations have played with light, sound, and material in ways that work for design novices and professionals alike. The district hubs each have their own character and are walkable within their clusters.
London Design Festival is a fixed September event; the installations are temporary and dismantled after the festival closesBooking tipMost installations are free and walk-in; some talks and workshops require advance booking through the festival website
Swim in the Hampstead Heath ponds before the water gets too cold
outdoorsSeptember is likely the last comfortable month for the mixed and single-sex bathing ponds on Hampstead Heath. The water still holds some summer warmth in the first half of the month, though it drops noticeably week by week. The surrounding trees are just starting to turn, and the light through the canopy is softer than in July. By late September, you'll feel the chill the moment you get in — but plenty of regulars keep going through October and beyond.
Water temperatures are still holdable from summer warmth but dropping; this is the last month of relatively comfortable outdoor swimming before winter hardiness is requiredWhat to eat in September
In season: fruit
Damson plums
These small, intensely tart plums show up for just a few weeks in September. You'll find them in jams and preserves at market stalls, and occasionally in crumbles and fools on restaurant dessert menus. Too sour to eat raw, but cooked they have a depth that regular plums can't touch.
Blackberries
Wild blackberries are everywhere in September — along canal towpaths, in park hedgerows, on suburban fences. The ones at farmers' markets tend to be plumper and sweeter than supermarket versions, still warm from the sun if you catch the morning stalls.
Apple and pear varieties
English heritage apple varieties start arriving at farmers' markets — varieties you won't see in supermarkets, with names like Cox's Orange Pippin and Egremont Russet. The texture and tartness vary wildly between varieties, which is half the fun of sampling.
In markets
Native oysters
The native oyster season opens on the first of September — look for Colchester and Whitstable natives at seafood restaurants and raw bars across the city. They're briny, complex, and noticeably different from the rock oysters available year-round.
Wild mushrooms
Chanterelles, ceps, and porcini start appearing at Borough Market and on gastropub menus. The earthy, almost nutty smell of a proper wild mushroom risotto drifting out of a restaurant door is one of September's signature scents.
Game birds
Grouse season opened in August, but September is when partridge and early pheasant join the menus. Gastropubs and higher-end restaurants across the city run game specials — rich, dark meat that pairs well with the root vegetables also coming into season.
Regular events in September
Totally Thames FestivalFree
A month-long programme of arts, cultural, and environmental events along the river — from source art installations near the Estuary to community events in central London. The scale varies year to year, but there's usually a mix of free outdoor performances, river-related exhibitions, and guided walks along less-known stretches of the Thames.
Throughout SeptemberLondon Fashion Week
The city's contribution to the global fashion calendar, centred around venues in the West End and the BFC Show Space. Most runway shows are industry-only, but the surrounding energy spills into the streets — particularly around Somerset House, Soho, and Shoreditch. Pop-up shops, sample sales, and fashion-adjacent events tend to cluster in the same week.
Mid-September, usually five daysGreat River RaceFree
A traditional boat race along the Thames from Millwall to Ham in Richmond — over 300 crews in everything from Viking longboats to Chinese dragon boats to Thames wherries. It's chaotic, colourful, and surprisingly entertaining to watch from the riverbank. The stretch around Putney and Barnes tends to draw the biggest crowds.
Mid-September SaturdayPearly Kings and Queens Harvest FestivalFree
The Pearly Kings and Queens of London gather at the Guildhall Yard for their annual Harvest Festival — a tradition rooted in Victorian costermonger culture. The button-covered suits are genuinely something to see up close, each one hand-sewn with thousands of mother-of-pearl buttons in distinct patterns. There's usually Morris dancing, maypole dancing, and a parade to a nearby church.
Last Sunday of SeptemberBest places this September
Royal Albert Hall
cultureThe Proms season culminates here in September, but even outside concert nights the building is worth seeing — the terracotta exterior, the mushroom-shaped acoustic diffusers on the ceiling, the sheer scale of the auditorium. Guided tours run regularly and take you backstage.
KensingtonBorough Market
foodSeptember transforms the market's seasonal offering. The game butchers, the mushroom stalls, the apple vendors with heritage varieties — it's a different market from the summer one. The enclosed hall has a particular smell in autumn: earthy, meaty, with woodsmoke from the charcoal grills drifting through.
SouthwarkHampstead Heath
outdoorsThe combination of the bathing ponds, the panoramic view from Parliament Hill, and the first hints of autumn colour in the ancient woodland makes Hampstead Heath especially rewarding in September. The light across the heath in late afternoon is the kind of thing that makes you stop walking and just look.
HampsteadV&A Museum
cultureThe London Design Festival uses the V&A as its central hub, which means the museum gets a layer of contemporary installations over its permanent collection. The courtyard usually hosts the festival's flagship commission. The contrast between a cutting-edge design installation and the Victorian galleries surrounding it is part of the point.
South KensingtonRegent's Canal towpath
outdoorsWalk from Little Venice through Camden Lock to King's Cross — the towpath is at its best in September when the summer crowds have thinned and the narrowboats are moored with their late-summer window boxes still in bloom. The stretch through Islington's tunnel and past Victoria Park extends the walk into east London if you have the legs for it.
CamdenKew Gardens
outdoorsSeptember is when Kew starts its autumn display — the Temperate House collection, the arboretum beginning to turn, and the last of the summer bedding still holding on. The smell inside the Palm House — warm, humid, vegetal — is a welcome contrast to the cooling outdoor air.
RichmondTate Modern
cultureAutumn exhibition launches often bring the Tate Modern's strongest programming. The Turbine Hall commission, which typically opens in October, sometimes has preview elements in September. The building itself — that vast converted power station — feels different as the light changes: the enormous windows on the upper floors catch the lower September sun at angles that shift through the day.
BanksideColumbia Road Flower Market
shoppingThe Sunday flower market shifts to autumn blooms in September — dahlias, chrysanthemums, late roses. The narrow street packed with stalls and the sound of vendors calling out deals is the same year-round, but the colour palette changes with the seasons. The surrounding independent shops and cafés open their doors on Sunday mornings too.
Shoreditch
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Insider tips
Open House London's walk-in buildings are often more interesting than the ballot ones — the ballot sites get the headlines, but places like the Crossrail tunnels, the Masonic lodges in Great Queen Street, and the lesser-known Inns of Court chapels tend to have shorter queues and more knowledgeable volunteers
The Proms season includes dozens of concerts beyond the Last Night, and tickets for regular Proms performances are usually available — standing tickets in the arena are among the cheapest ways to hear world-class orchestras in one of the finest concert halls anywhere
Borough Market on a Tuesday or Wednesday morning is a completely different experience from the Saturday crush — the same vendors, the same produce, but you can actually talk to the stallholders and taste samples without being swept along by the crowd
September is when many West End shows launch their autumn runs, and preview performances in the first week or two of a new production tend to have better seat availability and sometimes reduced prices compared to the established run
The galleries along Cork Street and in Mayfair host Thursday evening private views for their autumn exhibitions — most are technically invitation-only but in practice welcoming to anyone who walks in looking interested, and they usually serve wine
If the weather holds, rent a Boris bike and ride from Hyde Park Corner through the parks to Kensington Palace — the dedicated cycle lanes through the park are flat, traffic-free, and the September light through the plane trees is worth the trip alone
Avoid these mistakes
- Assuming September weather will be reliably warm — the averages are comfortable, but individual days can swing from 24°C sunshine to 14°C drizzle with little warning. Checking the forecast each morning and dressing in layers is the only reliable strategy
- Not booking Open House London ballot buildings in advance — the most popular sites fill their ballot weeks before the event weekend, and showing up on the day means you're limited to walk-in buildings only
- Packing only for warm weather because 'it's still technically summer' — by late September, evenings are genuinely cool and rain is frequent. The biggest packing mistake visitors make is leaving the waterproof layer at home
- Trying to see too many Open House buildings in one day — the sites are spread across the city and queues at popular walk-in buildings can run over an hour. Pick a neighbourhood cluster and explore three or four properly rather than rushing between eight
- Dismissing the free museums because you've 'already done them' — the V&A, British Museum, and National Gallery all launch autumn exhibitions in September that change the experience substantially from whatever you saw on a previous visit
Practical tips for September
September bookings for popular restaurants tend to be easier than summer but still necessary for sought-after spots — aim for midweek lunches if you want flexibility, and book dinner reservations at least a few days ahead for anything in Soho or Shoreditch. Oyster cards or contactless payment work on all public transport; the Tube is the fastest way across the city, but September's comfortable temperatures make buses and walking genuinely viable for shorter journeys, and you see far more of the city from the top deck of a bus than from underground. Keep an eye on TfL's website for planned engineering works — weekend Tube closures are common in September as maintenance schedules run. Museum queues are shorter than summer but the big three (British Museum, Natural History Museum, Tate Modern) still benefit from arriving in the first hour after opening. If you're visiting Open House London, download the app ahead of time — the map feature and queue-time estimates save real frustration on the day.
FAQ
Is September a good time to visit London?
September is widely considered one of the better months. Temperatures are comfortable for walking, the cultural calendar is packed with headline events like Open House London and the Proms finale, and the summer crowds have noticeably thinned. The trade-off is more rain than August and shortening days, but most visitors find the balance favourable.
How rainy is London in September?
September averages about 77mm of rain across roughly 12 wet days — a noticeable step up from August. That said, the rain tends to come in passing showers rather than all-day downpours. A compact waterproof jacket and umbrella will get you through most days comfortably, and the showers rarely last more than an hour or two.
What should I wear in London in September?
Layers are the key. Daytime highs around 20°C mean a t-shirt or light shirt is fine when the sun is out, but you'll want a jumper or light jacket for the mornings, evenings, and whenever clouds roll in. A waterproof outer layer is close to non-negotiable. Sturdy walking shoes with good grip handle the wet pavements better than fashion trainers.
Are the museums less crowded in September than summer?
Noticeably so, particularly after the first week when schools are back. The major free museums (British Museum, V&A, National Gallery, Tate Modern) still draw steady visitors, but the shoulder-to-shoulder summer queues ease considerably. Weekday mornings are the quietest; weekends still see healthy numbers but nothing like July or August.
Is it warm enough to swim outdoors in London in September?
In the first half of September, the Hampstead Heath ponds and the Serpentine Lido still hold some summer warmth and swimming is comfortable if brisk. By late September, water temperatures drop noticeably and you'll feel the cold as soon as you get in. Committed swimmers keep going, but casual dippers might find it more challenging than enjoyable after mid-month.
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