Washington Weather in September
United States · 30-year monthly averages
👍 Good time to visit
September in Washington is warm, with average daytime highs around 27°C (81°F) and nighttime lows near 18°C (64°F). Expect roughly 100mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
Avg high
27°C
81°F
Avg low
18°C
64°F
Rainfall
100mm
moderate
Rainy days
7
days with ≥1mm
🎒 What to pack
- light summer clothing
- sunscreen and sunglasses
September vs the rest of the year
FAQ
- How hot is Washington in September?
- September in Washington is warm, with average daytime highs around 27°C (81°F) and nighttime lows near 18°C (64°F). Expect roughly 100mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
- Does it rain a lot in Washington in September?
- Washington sees around 100mm of precipitation in September on average — moderate by global standards.
- Is September a good time to visit Washington?
- September is a good month to visit Washington, with generally agreeable conditions.