What to Wear in Phoenix in September
September in Phoenix is still extremely hot — triple-digit temperatures are common throughout the month, with highs near 99°F and lows around 75°F. Only about 3 rainy days bring brief monsoon-season relief. Ultra-light breathable fabrics, serious sun protection, and limiting outdoor activity to early morning are essential for visiting the Valley of the Sun in September.
What to wear
top / Tank & Cami
tank top
breathable — lets heat escape in warm weather
bottom / Shorts
denim shorts
breathable fabric for high-heat days
lightweight linen pants for more coverage
footwear / Sandals
flat sandals
let feet breathe in the heat
white sneakers if you walk a lot
Based on typical September conditions in Phoenix. Weather varies year to year — check the live forecast when you're within two weeks of your trip.
September in Phoenix, Arizona, marks a transitional period where the scorching summer heat begins its gradual retreat, though daytime temperatures remain significantly warm. Expect average highs to hover in the upper 90s to low 100s Fahrenheit (35-38°C), with evenings offering a slight reprieve, typically cooling to the mid-70s Fahrenheit (24-26°C). While the official monsoon season typically winds down mid-month, early September might still see an occasional, brief afternoon thunderstorm, though prolonged precipitation is unlikely. Humidity levels are generally low, and sunshine is abundant. To navigate Phoenix's September heat comfortably, prioritize lightweight, breathable fabrics like cotton, linen, and moisture-wicking materials. Light-colored clothing is essential to reflect the sun. Pack loose-fitting tops, shorts, skirts, and dresses. Sun protection is paramount: bring a wide-brimmed hat, sunglasses, and high-SPF sunscreen. While evenings are cooler, they rarely require heavy layers; a light cardigan or denim jacket might be useful for air-conditioned indoors or or late nights. Comfortable open-toed shoes or sandals are ideal for daytime, with closed-toe options for evening activities if preferred. Staying hydrated is also crucial.
Curated Looks
No outfits found for this style. Try a different filter.
Other Months in Phoenix
Frequently Asked Questions
What should I wear in Phoenix in September?+
In September, Phoenix remains very warm, so focus on lightweight, breathable fabrics like cotton, linen, or moisture-wicking materials. Opt for light-colored clothing to reflect the sun, including shorts, skirts, dresses, and loose-fitting tops. Don't forget sun protection essentials like a wide-brimmed hat, sunglasses, and sunscreen.
Is Phoenix cold in September?+
No, Phoenix is generally not cold in September. Daytime temperatures typically range from the upper 90s to low 100s Fahrenheit (35-38°C). Evenings cool down but usually remain in the mid-70s Fahrenheit (24-26°C), requiring at most a very light layer for comfort in air-conditioned spaces or late-night outings.
Does it rain in Phoenix in September?+
While the monsoon season officially tapers off by mid-September, there's a slight chance of isolated, brief afternoon thunderstorms early in the month. However, prolonged or heavy rainfall is uncommon. Expect mostly sunny and dry conditions throughout September in Phoenix.
What should I pack for Phoenix in September?+
Pack an array of lightweight, light-colored clothing such as shorts, skirts, sundresses, and loose tops made from cotton or linen. Essential accessories include a wide-brimmed hat, sunglasses, high-SPF sunscreen, and comfortable sandals or open-toed shoes. A light jacket or cardigan can be useful for air-conditioned indoor environments or cooler evenings.
Packing Calculator
How many outfits do you actually need?
Free · no sign-up needed