Phoenix Weather in September
United States · 30-year monthly averages
🤔 Fair time to visit
September in Phoenix is extremely hot, with average daytime highs around 38°C (100°F) and nighttime lows near 26°C (78°F). Expect roughly 15mm of precipitation spread over about 2 rainy days, and rain is rare.
Avg high
38°C
100°F
Avg low
26°C
78°F
Rainfall
15mm
very dry
Rainy days
2
days with ≥1mm
🎒 What to pack
- very light, loose clothing
- high-SPF sunscreen and a sun hat
- plan activities for early morning or evening
September vs the rest of the year
FAQ
- How hot is Phoenix in September?
- September in Phoenix is extremely hot, with average daytime highs around 38°C (100°F) and nighttime lows near 26°C (78°F). Expect roughly 15mm of precipitation spread over about 2 rainy days, and rain is rare.
- Does it rain a lot in Phoenix in September?
- Phoenix sees around 15mm of precipitation in September on average — very dry by global standards.
- Is September a good time to visit Phoenix?
- September is a workable month to visit Phoenix, but expect some weather trade-offs.