Climate
Weather in United States in September
Weather in United States, September
In September, United States sees average highs of 26.1°C (79°F) and lows of 16.8°C (62°F), with around 116 mm of rain. It is one of the best months to visit.
United States — September
United States → September
- Daytime high
- 26.1°C (79°F)
- Overnight low
- 16.8°C (62°F)
- Rainfall
- 116 mm
- Best-time rank
- Recommended month
How September compares
| This month | 26.1°C (79°F) / 16.8°C (62°F) · 116 mm |
|---|---|
| Yearly average | 19.5°C (67°F) / 9.7°C (49°F) · 108 mm |
September in United States runs 6.6°C (11.9°F) warmer than the yearly average, and is wetter than the yearly average. Pack layers you can adjust through the day — mild conditions, and something waterproof — this is a wetter month.
Common questions
What is the weather like in United States in September?
Average highs of 26.1°C (79°F) and lows of 16.8°C (62°F), with around 116 mm of rain.
Is September a good time to visit United States?
Yes — September is one of the more comfortable months in United States, based on temperature and rainfall.
Updated climate normals, 2025