Boston, Massachusetts Weather in September
United States · September climate averages and travel tips
Avg high24°C (75°F)
Avg low13°C (56°F)
Rainfall97 mm (3.8 in)
RatingExcellent 8.9/10
In September, Boston has average highs of 24°C (75°F) and lows of 13°C (56°F). September is autumn (fall) in United States. The month is moderately rainy, with about 97 mm (3.8 in) of rain spread over 9 days. You get roughly 12.3 hours of daylight and a mix of sun and cloud.
Is September a good time to visit Boston?
Yes — September is one of the best months to visit Boston. The weather rates excellent (8.9/10) on our comfort score.
September weather at a glance
| Average high | 24°C (75°F) |
|---|---|
| Average low | 13°C (56°F) |
| Daily mean | 18°C (65°F) |
| Rainfall | 97 mm (3.8 in) |
| Rainy days (1 mm+) | 9 |
| Humidity | 75% |
| Cloud cover | 52% |
| Daylight | 12.3 hours |
| Est. sunshine | 6.5 hours/day |
| Wind | 1.7 km/h |
| vs August | 4°C cooler than August, with similar rainfall. |
What to pack for Boston in September
- T-shirts plus a light layer for the evening
- an umbrella or rain jacket
Boston weather in other months
Jan1°C / -7°C95 mmPoorFeb2°C / -7°C88 mmPoorMar6°C / -3°C108 mmPoorApr13°C / 3°C107 mmFairMay19°C / 9°C93 mmExcellentJun24°C / 14°C109 mmGoodJul28°C / 18°C113 mmGoodAug27°C / 17°C95 mmGoodSep24°C / 13°C97 mmExcellentOct17°C / 8°C126 mmGoodNov10°C / 1°C97 mmFairDec4°C / -3°C121 mmPoor
← AugustBest time to visit BostonOctober →
Better weather in September nearby
Nearby in September
- The Bronx, New York25°C · 104 mm
- Queens, New York23°C · 102 mm
- Manhattan, New York25°C · 104 mm
- New York23°C · 102 mm
- Brooklyn, New York23°C · 102 mm
- Montreal21°C · 82 mm
Where else is good in September? See where to go in September.