Phoenix Weather in September
Phoenix in September sees extremely high daytime temperatures of 38°C (100°F) and nighttime lows of 24°C (75°F). Low rainfall is typical, with around 23 mm (0.9 in) for the month.
Rainfall in Phoenix in September
Past climate data indicates that roughly 4 days will see rain, totalling around 23 mm (0.9 in) for the month. The odd shower may pass through, but it usually doesn't amount to much. A largely dry month overall.
Temperature in Phoenix in September
September in Phoenix sees highs of 38°C (100°F) and lows of 24°C (75°F) overnight. For most visitors, the main thing to prepare for is the heat during the day. At 24°C (75°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Phoenix in September
Expect a lot of sunshine this month, with about 328 hours of sun. These sunny conditions add to the overall experience.September in Phoenix can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Phoenix's climate page.
Phoenix Temperature in September
Min Temperature
24°C (75°F)
Max Temperature
38°C (100°F)
Chance of Rain
12%
Precipitation
23 mm (0.9 in)
Rainy days
4 days
Humidity
35%
Sunshine
328 hours
Percentage Sunshine
89%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Phoenix typically drop from around 39°C (102°F) at the start of September to approximately 36°C (97°F) by the end. Nights are warm, with lows typically ranging from 23°C (73°F) to 28°C (82°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Phoenix in September
Browse day-by-day weather records for Phoenix spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Phoenix historical weather extremes in September
Based on 49 years of weather observations in Phoenix between 1976 and 2025, these are the recorded extremes.
- The warmest day in September was on September 28, 2024, with a maximum of 46°C (115°F).
- On September 24, 1986, Phoenix saw its coldest September day with temperatures maxing out at 23°C (73°F).
- The lowest overnight temperature recorded in September was 13°C (55°F) (September 20, 1978).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Phoenix in September
Get ready for hot weather in September! Lightweight, breathable fabrics are your best friend during this month. Cotton and linen shirts, shorts, sundresses, and sandals will keep you comfortable. Light colors help reflect the heat, avoid wearing black. Some rain is possible, so pack something to handle light showers. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Phoenix in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Phoenix's climate page.
Temperature Rainfall Sunshine Humidity
See the full Phoenix climate overview or explore weather in the United States of America.
