Seattle Weather in September
United States · 30-year monthly averages
🌟 Great time to visit
September in Seattle is pleasantly warm, with average daytime highs around 22°C (72°F) and nighttime lows near 12°C (54°F). Expect roughly 41mm of precipitation spread over about 6 rainy days, with little rainfall.
Avg high
22°C
72°F
Avg low
12°C
54°F
Rainfall
41mm
dry
Rainy days
6
days with ≥1mm
🎒 What to pack
- light layers
- comfortable walking shoes
September vs the rest of the year
FAQ
- How hot is Seattle in September?
- September in Seattle is pleasantly warm, with average daytime highs around 22°C (72°F) and nighttime lows near 12°C (54°F). Expect roughly 41mm of precipitation spread over about 6 rainy days, with little rainfall.
- Does it rain a lot in Seattle in September?
- Seattle sees around 41mm of precipitation in September on average — dry by global standards.
- Is September a good time to visit Seattle?
- September is one of the best months to visit Seattle — comfortable temperatures and manageable rainfall.