September in Kathmandu is still monsoon. That is the single most important fact. Expect rain on 29 out of 30 days, with 367mm falling over the month and humidity sitting around 89%. The valley will be soaked, the streets will flood in places, and trekking routes above 3,000m are largely inadvisable due to landslide risk and leeches. Temperatures hover around 26°C (80°F) during the day and drop to a mild 19°C (65°F) at night, so the heat itself is manageable. The air feels heavy, though, the kind of sticky warmth where your clothes cling to you before you've walked 200 metres from your hotel in Thamel.
That said, September is not July. Rainfall has dropped by half compared to July's 768mm peak, and by late September the monsoon is visibly loosening its grip. Mornings often start clear, with rain arriving in the afternoon or evening. The Kathmandu Valley is at its greenest. Rice paddies in the outskirts near Bhaktapur and Kirtipur glow an almost unreal shade of emerald. And the crowds that pack the temples in October and November are simply absent.
The real reason to consider September is Indra Jatra, Kathmandu's own festival, typically held in mid-September around Basantapur and Hanuman Dhoka. The living goddess Kumari is paraded through the old city streets in a towering wooden chariot. It is one of the few festivals that belongs specifically to Kathmandu, not to Nepal broadly, and it draws remarkably few international visitors compared to its significance. If you time your trip around those 8 days, September has a genuine argument. If you are coming purely for trekking or clear mountain views, wait until October.
Why visit in September
- Indra Jatra, Kathmandu's defining festival, draws a fraction of the tourists that October's Dashain attracts, so you can watch the Kumari chariot procession from Basantapur Square without being crushed against barriers.
- Hotel rates in Thamel and Patan drop to their annual low. Guesthouses that charge 4,000-5,000 NPR per night in October might ask 1,500-2,500 NPR in September.
- The Kathmandu Valley is at peak green. Rice terraces around Khokana and Bungamati look like postcards, and the air is washed clean between showers, giving occasional Himalayan views that the dusty dry season rarely delivers.
- Temples and heritage sites like Patan Durbar Square and Boudhanath Stupa are noticeably quieter, so you can photograph without tour groups blocking every angle.
Worth knowing
- Rain falls on roughly 29 of 30 days. Not always all-day downpours, but enough to disrupt any plan that depends on dry weather. Roads around Asan and Kalimati flood regularly after heavy afternoon storms.
- High-altitude trekking to Annapurna or Everest Base Camp is inadvisable. Trails above the treeline are slippery, cloud cover blocks the views, and leeches are aggressive in forested sections below 3,500m.
- Humidity averaging 89% makes walking the city feel more tiring than the mild 26°C reading suggests. Laundry takes 2-3 days to dry in guesthouses without dryers.
- Some regional roads, particularly toward Pokhara and Langtang, face temporary closures due to landslides. Domestic flights cancel more frequently than in dry season.
Best for
Think twice if
Late monsoon. Rain arrives most afternoons, sometimes as brief 30-minute cloudbursts, sometimes as multi-hour downpours that flood lower streets. Mornings tend to be clearer, especially in the last 10 days of September as the monsoon begins to retreat. The temperature is mild compared to the scorching plains of the Terai. Overcast skies keep it from feeling hot, but the humidity is relentless. Nights cool to a comfortable 19°C (65°F), so sleeping without air conditioning is possible if your room has a ceiling fan.
Seasonal caution
- Landslide risk on mountain highways, particularly the Prithvi Highway to Pokhara and roads into Langtang and Helambu. Check road status before any overland journey outside the valley.
- Flash flooding in low-lying parts of the Kathmandu Valley, particularly along the Bagmati and Bishnumati river corridors. Avoid walking near swollen rivers after heavy rain.
- Leeches are active on any trail below 3,500m. Forest walks around Shivapuri Nagarjun National Park and Champadevi will involve encounters, particularly after rain.
- Mosquito-borne dengue cases tend to rise in September. Use repellent, especially in the evenings around Thamel and the Bagmati corridor.
Year-round climate
Averages from the last 5 years.
| Month | Avg high (°C) | Avg low (°C) | Rainfall (mm) |
|---|---|---|---|
| Jan | 18 | 5 | 9 |
| Feb | 19 | 6 | 20 |
| Mar | 23 | 11 | 42 |
| Apr | 27 | 15 | 43 |
| May | 26 | 16 | 233 |
| Jun | 27 | 19 | 424 |
| Jul | 27 | 20 | 768 |
| Aug | 27 | 20 | 644 |
| Sep | 26 | 19 | 367 |
| Oct | 24 | 15 | 141 |
| Nov | 21 | 10 | 10 |
| Dec | 18 | 6 | 6 |
Headline events
Indra Jatra
Mid-September, varies by lunar calendar (Bhadra Shukla Dwadashi). Typically falls between September 10-25.
Kathmandu's own 8-day festival honouring the rain god Indra. The highlight is the chariot procession of the Kumari, Kathmandu's living goddess, through the old city streets around Basantapur and Hanuman Dhoka. Masked dancers represent Lakhe (a demon figure), and the Majipa Lakhey performs nightly in Durbar Square. The king of Nepal historically received tika here. Large bamboo poles (lingo) are erected at Hanuman Dhoka to mark the start.
Best things to do in September
Watch the Kumari chariot procession at Indra Jatra
festivalThe living goddess Kumari, a prepubescent Newar girl selected through an elaborate process, rides through the streets of old Kathmandu in a towering wooden chariot pulled by devotees. Crowds line the route from Hanuman Dhoka through Basantapur to Indrachowk. Masked Lakhe dancers perform alongside the procession, and effigies of Ganesh and Bhairav ride in smaller companion chariots.
Indra Jatra only happens once a year, in September, and the Kumari chariot procession is its centrepiece. No other month offers this.Booking tipNo booking needed. Arrive at Basantapur Square by 3pm on the main procession day for a good viewing spot. Upper-floor restaurants on the square sometimes offer reserved window seats for a meal purchase.
Photograph the monsoon-green rice terraces of the valley rim
photographyThe villages of Khokana, Bungamati, and Kirtipur on Kathmandu's southern edge sit among rice paddies that reach their deepest green in September. The paddies are flooded and brilliantly reflective. Morning light before the clouds build offers the best conditions, typically between 6am and 9am.
Rice paddies are at peak green only during monsoon. By October, harvesting begins and the fields turn brown. September's retreating monsoon offers slightly more morning clarity than July or August.Booking tipHire a local taxi for a half-day circuit. Negotiate 3,000-4,000 NPR for a morning loop through all three villages.
Explore Patan Durbar Square without crowds
culturePatan's 17th-century Durbar Square, with its concentration of Newari temples and the Patan Museum, is normally thick with tour groups from October onward. In September, you might share the Krishna Mandir courtyard with a handful of locals and stray dogs. The museum's collection of bronze Buddhist and Hindu statuary is one of the best in South Asia.
Tourist numbers in September are a fraction of peak season. You can photograph the stone carvings and temple details without waiting for groups to move. Patan Museum's interior is a good rainy-afternoon option.Booking tipPatan Museum charges 1,000 NPR entry for foreigners. No advance booking needed.
Walk through Boudhanath Stupa at dawn
cultureThe massive white dome of Boudhanath, one of the largest stupas in the world, sits in the Tibetan quarter of eastern Kathmandu. In September mornings, before the rain arrives, monks in maroon robes circle the stupa alongside local Tibetan residents. The smell of juniper incense from surrounding monasteries mixes with damp stone. Butter lamps flicker in the niches.
September mornings are often clear before the afternoon rain builds, and the low-season quiet means the kora (circumambulation) path is not congested with tour groups. October and November mornings are clearer but far more crowded.Eat your way through Asan Bazaar's monsoon produce
foodAsan, Kathmandu's oldest market neighbourhood, is at its most sensory in September. Vendors stack fresh guavas, lapsi, seasonal greens, and monsoon mushrooms on narrow lanes. Spice merchants weigh out fresh turmeric and green cardamom. The air smells like wet stone, cumin, and frying sel roti from nearby stalls. It is loud, chaotic, and genuinely difficult to navigate with an umbrella.
September is the peak of monsoon produce season. Fresh lapsi, guavas, and seasonal greens appear now and largely disappear by November. The market operates year-round, but the September inventory is distinct.Booking tipNo booking. Go between 8am and 10am to beat both the crowds and the afternoon rain. Asan is a 10-minute walk south from Thamel.
Visit Pashupatinath Temple during Teej
festivalIf Teej falls in early September (it varies by lunar calendar), Pashupatinath becomes a sea of women in red saris. Thousands gather at the temple complex on the Bagmati River to fast, sing, and pray for marital wellbeing. The atmosphere is intense. Singing groups form spontaneously, and the colour contrast of red fabric against grey monsoon skies is striking.
Teej is a once-a-year festival that sometimes falls in early September. The Pashupatinath gathering is the largest Teej celebration in Nepal. Outside this day, the temple is worth visiting but not transformative in the same way.Booking tipNo booking needed. Pashupatinath entry fee for foreigners is 1,000 NPR. Non-Hindus cannot enter the main temple but can observe from the surrounding complex and cremation ghats.
Day trip to Bhaktapur for Newari food and quiet temples
cultureBhaktapur, 13km east of central Kathmandu, preserves medieval Newari architecture better than Kathmandu itself. The 55 Window Palace and Nyatapola Temple in Taumadhi Square are remarkable. In September, the town is nearly empty of tourists. Juju dhau, the famously thick buffalo-milk yoghurt, is sold in clay pots near Pottery Square for 80-100 NPR.
September's low tourist count makes Bhaktapur feel like a living town rather than an open-air museum. The 1,500 NPR entry fee stings less when you have the squares mostly to yourself.Booking tipLocal buses run from Kathmandu's Kalanki bus stand every 15 minutes. The ride takes 45-60 minutes depending on road conditions. Taxis charge around 2,000-2,500 NPR one way.
Hike the Champadevi ridge on a clear morning
hikingThe trail to Champadevi (2,278m) starts from Pharping, about 20km south of Kathmandu. It climbs through forest and open ridge with views across the valley when skies cooperate. The hike takes 4-5 hours round trip. Leeches are present on the lower forested sections, but the ridge itself is above the worst of them.
This is one of the few hikes near Kathmandu that remains accessible during monsoon, since it stays below the dangerous high-altitude zone. On clear September mornings, you might catch Himalayan views that are rare during the hazy pre-monsoon months.Booking tipStart by 6am to maximize your chances of clear weather before afternoon clouds build. Bring leech socks and salt.
What to eat in September
In season: fruit
Lapsi (Nepali hog plum)
Tart green fruit that comes into season in September. Eaten raw with salt and chili, or made into a sweet-sour candy (lapsi paun) sold at Asan Bazaar and Kalimati market stalls. The flavour sits somewhere between a sour mango and a green apple.
Guava (amba)
Nepali guavas hit peak ripeness in September. Sold by fruit vendors throughout the city for 50-80 NPR per kilo. The white-fleshed variety is sweeter, but the pink-fleshed ones have a slightly more fragrant aroma.
On menus now
Kwati
A thick soup of 9 sprouted beans traditionally associated with Janai Purnima in August but still widely served through September in homes and local restaurants around Asan and Patan. Each household seems to have a slightly different ratio of black-eyed peas, soybeans, and chickpeas.
Gundruk soup
Fermented leafy green soup made from mustard greens and radish leaves preserved during the monsoon growing season. September is when fresh gundruk starts appearing. The flavour is sour and deeply savoury, served hot in small bowls at Newari restaurants in Patan and Bhaktapur.
Street food peaks
Roasted corn (makai)
Monsoon-harvested fresh corn, roasted over charcoal by street vendors throughout Asan, Basantapur, and along the ring road. The kernels are chewier and sweeter than the dried corn used the rest of the year. Vendors typically charge 30-50 NPR per cob.
Festival food
Sel roti
Ring-shaped rice flour bread, deep-fried until crispy on the outside and soft within. Closely associated with Teej and Dashain festivals, so September vendors begin making them in quantity. Best eaten warm from the oil at morning street stalls around Patan and Thamel.
Regular events in September
Teej (Haritalika Teej)Free
Major women's festival where married and unmarried women fast, sing, dance, and visit Pashupatinath Temple wearing red saris and gold jewellery. The Teej songs echo through Kathmandu for days before the main fasting day. The swinging (ping) tradition sees women on bamboo swings in parks and courtyards.
Late August to early September, varies by lunar calendar. Falls on Bhadra Shukla Tritiya.Rishi PanchamiFree
Observed the day after Teej. Women bathe ritually in the Bagmati River and at stone water spouts (dhunge dhara) across the city, particularly at Pashupatinath. Marks the end of Teej's fasting period. A quieter day than Teej itself, but the early morning bathing rituals along the Bagmati are striking.
The day after Teej, typically early September.Nepal Tourism Board heritage walksFree
Free guided walks through the old city, typically covering Kathmandu Durbar Square, Thamel's backstreets, and the Asan market corridor. Run on weekends during the low season to encourage domestic and budget tourism. Guides are usually local history students.
Weekends throughout September, starting at Basantapur Square at 9am.Best places this September
Kathmandu Durbar Square and Hanuman Dhoka
heritageThe epicentre of Indra Jatra. The old royal palace complex anchors the festival, and in September the square transforms with bamboo lingo poles, masked dancers, and the Kumari's chariot route. Outside festival days, the square's post-earthquake reconstruction is visibly progressing, with several temples restored since 2015.
BasantapurGarden of Dreams
parkA restored neo-classical garden from the 1920s, tucked behind the Kaiser Mahal near Thamel. The pavilions and pergolas offer a dry resting spot during sudden rain, and the manicured lawns and fountains feel worlds apart from the chaos of Thamel's main drag 50 metres away. Entry is 400 NPR.
ThamelSwayambhunath (Monkey Temple)
templeThe hilltop stupa west of central Kathmandu rewards the 365-step climb with valley views. In September, the surrounding forest is lush and the monkeys are well-fed. After rain, the steps can be slippery, so grip-soled shoes matter. Early morning visits, before 8am, offer the best chance of clear valley views.
SwayambhuBoudhanath Stupa
templeThe 36-metre-tall white dome dominates the Tibetan quarter. The rooftop restaurants circling the stupa offer sheltered views during rain. September's low crowds mean you can complete the kora walk at a contemplative pace rather than shuffling through tour groups.
BoudhaPatan Museum
museumHoused in a wing of the old Patan royal palace, this museum holds one of South Asia's finest collections of bronze religious sculpture and Newari woodcarving. Excellent for a rainy afternoon. The interior courtyard with its carved wooden struts is worth the entry alone.
Patan (Lalitpur)Asan Bazaar
marketKathmandu's oldest trading intersection. In September, monsoon produce piles high on the narrow lanes. The Annapurna Temple sits at the crossroads, and spice, grain, and vegetable vendors operate from dawn until dusk. It smells like turmeric, wet stone, and incense smoke.
AsanShivapuri Nagarjun National Park
natureThe forested hills directly north of Kathmandu. September turns the trails into tunnels of green. The Budhanilkantha entrance leads to a relatively easy 2-hour forest walk. Leeches are active, so come prepared. Entry is 1,000 NPR for foreigners.
BudhanilkanthaKirtipur
heritageA hilltop Newari town 5km southwest of central Kathmandu, largely overlooked by tourists even in peak season. The Bagh Bhairav temple and the narrow brick lanes feel medieval. September views across the rice paddies below are particularly green. Newari food stalls near the main square serve excellent chatamari, a Newari rice crepe.
Kirtipur
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Insider tips
Thamel's trekking gear shops sell last-season stock at deep discounts in September because the October trekking rush has not started yet. If you need a down jacket, rain gear, or trekking poles for a future trip, September is the time to buy. Bargain hard. Starting at 50% of the asking price is normal.
The best time to visit any outdoor site in September is between 6am and 10am. Mornings are often clear, sometimes startlingly so, with brief Himalayan views before the clouds build. By noon, overcast skies roll in, and by 2-3pm, rain arrives. Plan your sightseeing around this rhythm.
For Indra Jatra, skip the main chariot procession day if crowds bother you and attend the Lakhe masked dances on the evenings leading up to it. These happen in Kathmandu Durbar Square after dark and draw far fewer spectators than the chariot day.
Newari restaurants in Patan serve better food than the tourist-oriented places in Thamel, at roughly half the price. The area around Patan Durbar Square has several small family-run spots where a full Newari thali costs 400-600 NPR compared to 800-1,200 NPR in Thamel.
If you catch a clear morning, head to the rooftop of any tall building in Thamel or Boudha. Post-rain Himalayan views in September can be more dramatic than the dry-season standard because the air has been washed clean. These windows last 1-2 hours at most, so move fast.
Avoid these mistakes
- Booking a flight to Lukla or a multi-day trek for September. Domestic mountain flights cancel frequently due to cloud cover, and trails above 3,000m are risky from landslides and poor visibility. October is only a month away and categorically safer for trekking.
- Packing only cotton clothing. In 89% humidity, cotton absorbs sweat and rain, stays wet for days, and starts smelling by day 2. Synthetic or merino fabrics are not optional in monsoon Kathmandu. They are necessary.
- Scheduling outdoor plans for the afternoon. Afternoon rain is not a possibility in September. It is a near-certainty. Move all temple visits, market walks, and photography to the morning. Keep rainy afternoons for museums, cooking classes, or the Patan Museum.
- Skipping Indra Jatra because it seems like 'a local thing.' It is a local thing, and that is exactly why it is worth attending. The Kumari chariot procession through Basantapur is one of the most photographed events in Nepal, yet September's low tourist count means you might be one of the few foreigners there.
Practical tips for September
Book guesthouses in Thamel or Patan directly rather than through international booking platforms. September occupancy is so low that walk-in rates are often 20-30% cheaper than online listed prices, and owners are willing to negotiate for multi-night stays. Domestic flights (to Pokhara, Bharatpur, Biratnagar) should still be booked 2-3 days ahead since cancellations from weather delays compress demand onto remaining flights. Carry cash in Nepali rupees. ATMs in Thamel work but charge 500 NPR per withdrawal and occasionally run empty. Money changers near Basantapur Square offer better exchange rates than the airport. Many temples and heritage sites close ticket counters by 5pm, so do not assume late-afternoon entry. If Indra Jatra falls during your visit, the streets around Hanuman Dhoka close to vehicle traffic for the procession days. Plan an alternative walking route back to your hotel. Dress modestly at Pashupatinath and other Hindu temples. Shoulders and knees covered. This applies regardless of the heat.
FAQ
Is September a good time to visit Kathmandu?
It depends on what you want. For trekking or guaranteed mountain views, no. October and November are far better. For experiencing Kathmandu's cultural side at rock-bottom prices with almost no other tourists, September has a genuine case, especially if your visit overlaps with Indra Jatra. Expect rain every day, plan mornings outdoors, and bring waterproof everything. It is a fair month for the right traveller, not a good month for the average one.
What is the weather like in Kathmandu in September?
Late monsoon. Average highs of 26°C (80°F) and lows of 19°C (65°F) with 367mm of rainfall spread across roughly 29 days. Humidity sits at 89%. Mornings are often partly clear, with rain building through the afternoon and falling heaviest between 2pm and 7pm. Temperatures are mild compared to India's plains, but the humidity makes even 26°C feel sticky and tiring for walking.
Is Kathmandu crowded in September?
No. September is one of the quietest months for tourism in Kathmandu. Thamel's guesthouses run at perhaps 20-30% occupancy. Major sites like Boudhanath Stupa, Patan Durbar Square, and Swayambhunath have a fraction of their October-November visitor numbers. The only crowded moments come during Indra Jatra around Basantapur, and even then the crowd is overwhelmingly local.
Can I trek in Nepal in September?
Low-altitude walks near Kathmandu, like Champadevi (2,278m) or Shivapuri forest trails, are possible with preparation for leeches and slippery conditions. Multi-day high-altitude treks like Annapurna Base Camp, Everest Base Camp, or the Langtang Valley are strongly discouraged. Cloud cover blocks the views you are trekking to see, trails are muddy and landslide-prone, and domestic flights to trailheads like Lukla face frequent cancellations.
What festivals happen in Kathmandu in September?
Indra Jatra, typically mid-September, is the headline event. It is specific to Kathmandu and centres on the Kumari chariot procession through the old city. Teej, the women's fasting festival, sometimes falls in early September depending on the lunar calendar, with major celebrations at Pashupatinath Temple. Rishi Panchami follows Teej by one day. These are the 3 significant observances. Dashain preparations begin in late September but the festival itself falls in October.
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