Boston Weather in September
United States · 30-year monthly averages
🌟 Great time to visit
September in Boston is pleasantly warm, with average daytime highs around 23°C (73°F) and nighttime lows near 15°C (58°F). Expect roughly 90mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
Avg high
23°C
73°F
Avg low
15°C
58°F
Rainfall
90mm
moderate
Rainy days
7
days with ≥1mm
🎒 What to pack
- light layers
- comfortable walking shoes
September vs the rest of the year
FAQ
- How hot is Boston in September?
- September in Boston is pleasantly warm, with average daytime highs around 23°C (73°F) and nighttime lows near 15°C (58°F). Expect roughly 90mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
- Does it rain a lot in Boston in September?
- Boston sees around 90mm of precipitation in September on average — moderate by global standards.
- Is September a good time to visit Boston?
- September is one of the best months to visit Boston — comfortable temperatures and manageable rainfall.