September · United States
Best time to visit Phoenix in September Weather, crowds & prices
Weather in Phoenix in September
Average temperature 31°C, 17 mm of rain, about 28 days with 6+ hours of sunshine and 28% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
6.0/10
Ranked #11 of 12 months
- Avg temp
- 31°C
- Rainfall
- 17 mm
- Humidity
- 28%
- Days with 6h+ sun
- 28
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Phoenix scores 6.0/10 for sightseeing and cultural travel - ranked #11 of 12. Expect around 31°C, 17 mm of rain, and roughly 28 days with 6+ hours of sunshine this month.
Phoenix spreads across the Sonoran desert, with mountain trails, resorts and saguaro forests around it.
September in Phoenix: mixed conditions, plan around the weather
Days in September average 31°C (88°F) — front-load outdoor plans before the heat builds and treat the middle of the day as indoor time.
With around 17 mm of rain, any showers tend to pass through rather than settle in; about 28 days with 6+ hours of sunshine and 12.2 hours of daylight fill the rest.
That is 6/10 on the same scale — 11th of 12 months, versus 9.6/10 for the best month here.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary.
Budget for low-season pricing, and crowds are light for this destination.
If your dates are flexible, March is materially better in Phoenix — 3.6 points higher on the same scale.
Frequently asked
- What is the weather like in Phoenix in September?
- In September, Phoenix averages 31°C, 17 mm of rain, and about 28 days with 6+ hours of sunshine. Its climate-comfort score is 6.0/10.
- Is September a good time to visit Phoenix?
- September earns a 6.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Phoenix in September?
- Expect about 17 mm of rain in September. Average humidity is 28% and there are about 28 days with 6+ hours of sunshine.
Curated in Phoenix
Tickets & experiences
Things to do in Phoenix
Phoenix, United States. Live activities and tours from GetYourGuide, matched to this destination.