Things to Do in Phoenix in September

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September in Phoenix still averages 37.8°C (100°F) in the afternoon. That single fact should drive your entire decision. The city is technically cooling from its July peak of 41°C (106°F), but the difference between 41 and 38 degrees mostly matters to the saguaros, not to your skin. You will feel the dry heat press against your face the moment you step outside Sky Harbor's terminal doors, and by 2 p.m. the asphalt along Central Avenue will radiate enough warmth to feel through your shoe soles. The tail end of monsoon season means scattered thunderstorms that tend to build around 4 p.m., drop fat rain for 15 to 30 minutes, then vanish. Those storms fill the air with the smell of creosote on wet desert soil, a scent locals call petrichor and genuinely love.

The honest version: September is for Phoenix residents, deal-hunters, and people who already had a reason to be in Maricopa County. Hotel rates sit near their annual floor. Restaurants in Old Town Scottsdale and the Arcadia neighborhood that need reservations in February will seat you right away. The Arizona Diamondbacks are winding down their season at Chase Field, the Arizona Cardinals open their NFL schedule, and Arizona State University brings roughly 80,000 students back to Tempe, which gives Mill Avenue its semester energy. But outdoor sightseeing before 6 p.m. requires real caution. Maricopa County typically logs over 2,000 heat-related emergency visits each summer, and September still contributes to that count.

That said, the value proposition is real. Scottsdale resorts that command peak-season premiums in March tend to drop rates by half or more in September, making 4-star properties accessible to budget travelers. If you treat Phoenix as an early-morning and late-evening city, filling the midday hours with indoor attractions like the Musical Instrument Museum or the Heard Museum, September can work. It demands respect, though, and a willingness to rearrange your habits around the thermometer.

Why visit in September

Hotel rates drop 50-60% from peak season (November through March), putting Scottsdale resorts and downtown Phoenix boutique hotels within budget-traveler range.
No crowds at normally packed attractions like Desert Botanical Garden and Camelback Mountain, which see a fraction of their winter foot traffic.
Late-monsoon thunderstorms produce dramatic desert sunsets and cloud formations that tend to peak in September, drawing landscape photographers to South Mountain Park.
Arizona Cardinals and Diamondbacks seasons overlap, so sports fans can catch both NFL and MLB games in the same weekend trip.
Hatch green chile roasting season hits Phoenix in late August through September, filling parking lots outside grocery stores across the Valley with the smell of charring peppers.

Worth knowing

Average highs of 37.8°C (100°F) make outdoor activities before 6 p.m. genuinely risky without constant hydration and shade.
Most desert hiking trails, including Camelback Mountain's Echo Canyon trail, carry official heat advisories, and some trailheads close when temperatures exceed 41°C (106°F).
Monsoon storms can cause flash flooding in washes and low-lying roads, particularly along the Indian Bend Wash corridor through Scottsdale.
Many seasonal restaurants and some resort amenities remain closed or on reduced hours until October, when the snowbird season begins to ramp up.

Best for

Think twice if

Weather measured 38° / 25°C 38mm rain · 4 rainy days · 34% humidity rains perceptibly ~0.5h/day · 91% of mornings dry

Crowds low

Pack Lightweight, light-colored, loose-fitting clothing that covers your shoulders and neck. A wide-brimmed hat, not a baseball cap. High-SPF sunscreen you'll reapply every 90 minutes. A refillable insulated water bottle, ideally 1 liter or larger. Comfortable closed-toe shoes for any trail walking at dawn. A light rain shell that packs small for sudden monsoon downpours.

September in the Sonoran Desert is the long exhale after peak summer, but the relief is relative. Daytime highs still average 37.8°C (100°F), and many afternoons push past 40°C (104°F) in the first half of the month. Lows around 24.9°C (77°F) make mornings and evenings tolerable, sometimes even pleasant. Humidity sits around 34%, low compared to coastal cities but noticeably higher than Phoenix's bone-dry spring months of April and May. You'll get around 38mm of rain spread across roughly 4 days, mostly from brief, intense monsoon thunderstorms that build in the afternoon and pass quickly. The rain evaporates off pavement within an hour, but the microbursts can drop visibility and flood low-lying washes with surprising speed.

Seasonal caution

Extreme heat advisory conditions are common throughout September, with afternoon temperatures frequently exceeding 38°C (100°F). The National Weather Service issues Excessive Heat Warnings for the Phoenix metro area on the hottest days, typically when highs pass 43°C (110°F), which still happens in early September.
Flash flood watches accompany monsoon storms, particularly dangerous in normally dry washes and underpasses. The Indian Bend Wash through Scottsdale and the Cave Creek Wash in north Phoenix are repeat flood zones. Never drive through standing water on desert roads.
UV index reaches 10-11 (extreme) on clear September days. Sunburn can occur within 15 minutes of unprotected exposure at midday. The dry air masks the severity because you don't feel sweaty.
Dust storms (haboobs) occasionally precede monsoon thunderstorms, reducing visibility to near zero and carrying fine particulate matter. If you see a wall of brown dust approaching, get indoors or pull over and turn off your headlights.

Year-round climate

Averages from the last 5 years.

Monthly climate averages for Phoenix
Month	Avg high (°C)	Avg low (°C)	Rainfall (mm)
Jan	18	5	32
Feb	21	8	18
Mar	24	10	36
Apr	30	15	2
May	35	20	2
Jun	41	26	7
Jul	42	29	74
Aug	40	28	51
Sep	38	25	38
Oct	32	18	35
Nov	25	11	19
Dec	20	8	36

Best things to do in September

Sunrise hike at Piestewa Peak

outdoor

The Summit Trail (Trail 300) at Piestewa Peak covers 1.2 miles one way with about 360 meters of elevation gain. September sunrises happen around 6:15 a.m., and the first hour of light keeps temperatures in the high 20s°C. The trail is rocky and steep, so bring grippy shoes and a headlamp if you start before dawn.

September's later sunrises (compared to June's 5:15 a.m.) let you start at a reasonable hour while still beating the heat. The trail is nearly empty compared to the 200+ hikers per morning it sees in January.

First Friday Art Walk in Roosevelt Row

culture

On the first Friday of each month, the Roosevelt Row arts district between 3rd and 16th Streets opens 80+ galleries, studios, and pop-up exhibitions. Food trucks line Roosevelt Street. Live music spills out of Modified Arts and MonOrchid gallery. The walk runs from 6 p.m. to 10 p.m.

September's First Friday is the unofficial start of Phoenix's arts season. Galleries debut new fall shows, and the cooler evening temperatures (still around 35°C at 6 p.m., but dropping) make the outdoor walk more tolerable than July or August.

Musical Instrument Museum

culture

The MIM in north Phoenix at Tatum and Mayo Boulevards houses over 8,000 instruments from 200 countries and territories. Each exhibit includes video of the instrument being played, synced to wireless headphones. You can easily spend 3 to 4 hours here. The mechanical music gallery on the second floor has player pianos and orchestrions from the 1800s.

September's extreme heat makes MIM's fully air-conditioned 17,000-square-meter building a perfect midday refuge. The museum tends to be quiet on weekday afternoons, and you can walk the galleries without competing for headphone stations.

Arizona Diamondbacks game at Chase Field

sports

Chase Field's retractable roof and air conditioning make it one of the few outdoor-sport venues where September heat is irrelevant. The D-backs play their final homestand of the regular season in September, and the 48,686-seat stadium rarely fills past half capacity this time of year, so you can typically move to better seats after the 3rd inning.

September is the final month of the MLB regular season. If Arizona is in the playoff hunt, late-September games carry real stakes. If they're not, you still get cheap tickets and room to spread out.

Kayaking on the Salt River at sunset

outdoor

The Lower Salt River east of Mesa offers a flat-water paddle through the Tonto National Forest. The put-in at Water Users Recreation Area sits about 40 minutes from downtown Phoenix. September evenings bring wild horses to the riverbanks, and you might spot great blue herons hunting in the shallows.

September water levels on the Salt River tend to be higher from monsoon runoff, making the paddle smoother than the shallow, rocky conditions of May and June. Evening launches around 5:30 p.m. avoid the worst heat.

Heard Museum

culture

The Heard Museum on Central Avenue in the Encanto neighborhood holds one of the world's most significant collections of American Indian art. The 130,000-square-foot campus includes 12 exhibition galleries. The Barry Goldwater collection of Hopi katsina dolls alone has over 400 pieces.

Like MIM, this is a prime September midday option. The museum's permanent collection rotates seasonal exhibits in early fall, and weekday attendance in September is a fraction of the winter tourist season.

Desert Botanical Garden after dark

nature

The Desert Botanical Garden in Papago Park spans 55 acres with over 50,000 desert plants. In September, the garden stays open until 8 p.m. on select evenings, and the saguaros and barrel cacti cast long shadows as the sun drops behind the Papago Buttes.

September's monsoon moisture coaxes late-season blooms from barrel cacti and desert marigolds. The garden is far less crowded than during the winter Luminaria events, and evening temperatures drop enough to make the outdoor paths bearable.

Explore the Phoenix Mural scene

culture

The Roosevelt Row, Grand Avenue, and Garfield neighborhoods hold hundreds of large-scale murals. The concentration along Roosevelt Street between 7th Street and 16th Street is dense enough to cover on foot in about 90 minutes. Many walls were painted during the annual Artlink Juried Exhibition series.

September's softer early-morning and late-evening light produces better photographs of the murals than the flat midday sun of winter months. You'll have the streets largely to yourself before 8 a.m.

What to eat in September

In season: fruit

Prickly pear fruit
The Sonoran Desert's native prickly pear cactus fruits ripen through September. You'll find the magenta-colored tunas at farmers markets along the Valley, and several Phoenix restaurants fold them into margaritas, syrups, and sorbets. The flavor sits somewhere between watermelon and bubblegum, with a gritty texture from the seeds.
Medjool dates
Arizona's date harvest begins in September around the Yuma and Dateland growing regions south of Phoenix. Fresh Medjool dates start appearing at local markets and farm stands. They're softer and more caramel-like than the dried versions most people know, with a sticky sweetness that pairs well with the local goat cheeses.

Street food peaks

Sonoran hot dogs
Available year-round at carts and stands along Van Buren Street and south Phoenix, but September's late evenings make the outdoor hot dog cart experience bearable again after the worst of summer. The dogs are bacon-wrapped, grilled, then topped with pinto beans, onions, tomatoes, jalapeño sauce, and mayo on a bolillo roll.

In markets

Hatch green chiles
September is the tail end of Hatch chile season. Grocery stores and markets across the Valley set up roasting drums in their parking lots. The smell of charring peppers carries across entire shopping centers. You buy them by the bushel, 25 pounds at a time, and freeze them for the year. Locals put them on everything from burgers to eggs to pizza.

Regular events in September

Arizona Cardinals NFL home opener

The Cardinals typically play their first home game at State Farm Stadium in Glendale during September. The 63,400-seat stadium has a retractable roof and air conditioning, so the desert heat stays outside.

Mid-September

Tempe Festival of the Arts (fall edition)Free

Mill Avenue in Tempe hosts this arts festival featuring 350+ artists, live entertainment, and food vendors. The event runs along the 6-block stretch of Mill Avenue between University Drive and 5th Street.

Late September or early October

Arizona State University home football

ASU's Sun Devils open their Pac-12 home schedule at Mountain America Stadium (formerly Sun Devil Stadium) in September. The 53,599-seat venue sits right on the Tempe campus, and the student section brings energy even for non-marquee matchups.

Multiple Saturdays in September

Phoenix Film Festival Shorts

The Phoenix Film Festival runs short-film screening events at Harkins Scottsdale 101 theater through September, bridging the gap between the main spring festival and the fall season. Programs run about 90 minutes each.

Various dates throughout September

Best places this September

South Mountain Park and Preserve
nature
One of the largest municipal parks in the United States at over 6,500 hectares. The Dobbins Lookout summit offers 360-degree views of the Valley. Drive or bike the Summit Road early morning. The Mormon Trail offers a moderate 1.5-mile hike with less traffic than Camelback.
South Phoenix
Old Town Scottsdale
culture
A 20-block walkable district with over 100 galleries, Southwestern boutiques, and restaurants. The Scottsdale Museum of Contemporary Art sits at the district's north end. September foot traffic drops noticeably, so gallery owners tend to be more conversational.
Scottsdale
Papago Park
nature
A 600-hectare desert park sitting between Phoenix and Tempe. The Hole-in-the-Rock formation is a 10-minute scramble with views of downtown Phoenix. The park also contains the Phoenix Zoo and Desert Botanical Garden. The red butte formations glow at sunset.
East Phoenix
Heritage Square
history
A block of restored Victorian-era homes from the 1890s at 6th Street and Monroe in downtown Phoenix. The Rosson House Museum offers 45-minute guided tours. The surrounding park provides shade from mature trees, which feels like a luxury in September.
Downtown Phoenix
Taliesin West
architecture
Frank Lloyd Wright's winter home and architecture school in north Scottsdale. The 600-acre property sits at the base of the McDowell Mountains. Guided tours cover the drafting studio, the garden room, and Wright's personal living quarters. Tours run about 90 minutes.
North Scottsdale
Roosevelt Row
culture
Phoenix's central arts district stretching along Roosevelt Street. The neighborhood holds the highest concentration of independent galleries, coffee shops, and street art in the Valley. The intersection of Roosevelt and 3rd Street is the informal center.
Downtown Phoenix
Camelback Mountain (sunrise only)
nature
The Echo Canyon and Cholla Trail routes are among the most popular hikes in Arizona. September demands a pre-dawn start. The Echo Canyon trailhead parking lot fills by 5:30 a.m. on weekends even in low season. The summit sits at 824 meters with views across the entire Valley.
Arcadia

Your packing checklist

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Wide-brimmed sun hatA baseball cap leaves your ears and neck exposed. A hat with at least an 8cm brim protects the skin that burns fastest in the Sonoran sun.Shop
Insulated water bottle (1 liter minimum)Water from a non-insulated bottle reaches near-ambient temperature within 30 minutes in 38°C heat. A vacuum-insulated bottle keeps water cold for 6+ hours.Shop
SPF 50+ sunscreenReapply every 90 minutes. The 34% humidity in September is enough to make you sweat lightly, which strips sunscreen faster than you'd expect from a 'dry heat' city.Shop
Light-colored, loose-fitting long sleevesCounterintuitive, but covering your arms with breathable light fabric reduces sun exposure and can feel cooler than bare skin in direct desert sun.Shop
Packable rain shellMonsoon storms hit fast and hard in September, usually between 3 p.m. and 6 p.m. They pass in 15-30 minutes, but you'll be drenched without a shell. Choose one that packs into its own pocket.Shop
Comfortable closed-toe hiking shoesFor any dawn trail walk. The desert trails around Camelback and Piestewa are rocky and loose. Sandals are a fast path to a sprained ankle.Shop
Electrolyte packetsYou lose salt faster than you realize in dry desert heat. The low humidity means your sweat evaporates almost instantly, masking how much fluid you're losing.Shop
Portable phone chargerExtreme heat drains phone batteries faster than normal. GPS navigation and rideshare apps are essential for getting around the Valley's sprawl, so a dead phone is a real inconvenience.Shop

Insider tips

The best September strategy is the 'desert split day.' Wake at 5 a.m. for outdoor time until 10 a.m., retreat to air-conditioned museums or malls from 10 a.m. to 5 p.m., then re-emerge for dinner and evening activities. Locals have lived this rhythm for decades.
Grocery stores along Indian School Road and Camelback Road in central Phoenix set up Hatch chile roasting stations in their parking lots through September. AJ's Fine Foods and Fry's both run them. The roasting usually happens on weekends from 9 a.m. to 2 p.m.
If you're driving, leave a towel over your steering wheel and dashboard when you park. Interior car temperatures can exceed 70°C (158°F) in September. Bare metal seatbelt buckles will burn skin on contact.
The light rail runs from North Phoenix through downtown, Tempe, and Mesa. It's air-conditioned and covers the main cultural corridor. For a September visit, it can replace a rental car for the central city entirely.
Scottsdale's spa resorts run their steepest low-season discounts in September. Mind you, some of these properties restrict pool and restaurant hours during summer months, so confirm what's actually open before booking.

Avoid these mistakes

Starting a hike after 8 a.m. on Camelback Mountain or Piestewa Peak. By 9 a.m. in September, trail surface temperatures can exceed 60°C (140°F). The Phoenix Fire Department rescues hikers from these trails nearly every week in September.
Underestimating distances in the Valley. Phoenix's metro area covers over 37,000 square kilometers. A restaurant in Scottsdale and a museum in Tempe might appear close on a map but sit 30 minutes apart by car.
Skipping water because you 'don't feel thirsty.' The low humidity evaporates sweat so fast you can lose 1 liter of fluid per hour outdoors without feeling wet. By the time you feel thirsty, you're already behind on hydration.
Driving through flooded washes after a monsoon storm. Arizona has a 'Stupid Motorist Law' that can hold you financially responsible for your own rescue if you drive past barricades into floodwater. The water moves faster than it looks.
Planning a full outdoor itinerary. September Phoenix is not a city for wandering on foot between 10 a.m. and 5 p.m. Build your schedule around indoor attractions during peak heat, or you'll spend the trip hiding in your hotel room recovering.

Practical tips for September

September in Phoenix demands a schedule built around the thermometer, not the clock. Plan outdoor activities for the 2-hour window after sunrise (roughly 6:15 a.m. to 8:15 a.m.) and the 2-hour window before sunset (roughly 5:30 p.m. to 7:30 p.m.). Fill midday with air-conditioned attractions. The Musical Instrument Museum, Heard Museum, and Phoenix Art Museum can each absorb 3 to 4 hours. Scottsdale Fashion Square and Kierland Commons offer mall-based browsing if you run out of museum time. Restaurant reservations are rarely necessary, but check hours. Some establishments in Old Town Scottsdale and the Biltmore corridor operate on reduced summer schedules through September. Ride-share services cover the entire Valley but expect 10-15 minute wait times in the outer suburbs. Keep a case of bottled water in your car at all times. If you're renting, some agencies provide a complimentary sunshade for the windshield. Ask at the counter.

FAQ

Is September a good time to visit Phoenix?

September is one of the least popular months for tourism in Phoenix, and for good reason. Average highs of 37.8°C (100°F) make extended outdoor activity risky. That said, hotel rates drop 50-60% from the winter peak, crowds disappear, and the tail end of monsoon season brings dramatic sunsets. If you plan around the heat and fill midday with indoor attractions, it can work for budget-minded travelers.

Can you still hike in Phoenix in September?

You can, but only at dawn. Experienced hikers start Camelback Mountain and Piestewa Peak before 5:30 a.m. to finish by 8 a.m. The city posts official heat advisories on most trails, and some trailheads close entirely when temperatures exceed 41°C (106°F). The Phoenix Fire Department responds to heat-related hiking emergencies nearly every week during September.

What is monsoon season in Phoenix like?

Phoenix's monsoon season runs from June 15 through September 30. September tends to bring the tail end, with storms that build quickly in the afternoon, drop heavy rain for 15-30 minutes, then clear. The storms can produce flash flooding in dry washes and dust storms called haboobs. They also produce spectacular sunsets and the distinctive desert petrichor scent from creosote bushes.

Are Phoenix resorts cheaper in September?

September is among the cheapest months to stay at Scottsdale and Phoenix resorts. Rates typically drop 50-60% compared to the February-March peak season. Worth noting, some resorts reduce amenities during summer months, operating fewer restaurants or limiting spa and pool hours. Confirm what's open before you book.

What should I do in Phoenix when it's too hot to go outside?

The Musical Instrument Museum in north Phoenix, the Heard Museum on Central Avenue, and the Phoenix Art Museum in the Encanto neighborhood each offer 3-4 hours of air-conditioned exploration. Chase Field hosts Diamondbacks baseball under a closed roof. Scottsdale Fashion Square and Kierland Commons provide mall-based options. Several Scottsdale spas run deep discounts on treatments during September.