Boston Weather by Month
Twelve months of Boston, United States weather — averages from 2006–2025.
Boston's warmest month is July (average high 28.3°C (82.9°F)) and the coolest is January (2.4°C (36.3°F)). The most rain falls in December (about 119 mm), and August is the driest (about 87 mm). July is the sunniest, with about 11.4 hours of sunshine a day.
Best months to visit Boston
Ranked within Boston's own year by temperature comfort, rainy days and sunshine — historical averages, not a forecast.
Boston month by month
January
PoorHigh 2.4°C (36.3°F)
Low -6°C (21.2°F)
- Rainfall
- 95 mm (3.7 in)
- Rainy days
- 10 rainy days
- Sunshine
- 6.4 h sunshine / day
February
PoorHigh 3.5°C (38.3°F)
Low -5.8°C (21.6°F)
- Rainfall
- 90 mm (3.5 in)
- Rainy days
- 10 rainy days
- Sunshine
- 7.1 h sunshine / day
March
PoorHigh 7.7°C (45.9°F)
Low -1.7°C (28.9°F)
- Rainfall
- 111 mm (4.4 in)
- Rainy days
- 11 rainy days
- Sunshine
- 8.2 h sunshine / day
April
GoodHigh 13.6°C (56.5°F)
Low 4.1°C (39.4°F)
- Rainfall
- 100 mm (4 in)
- Rainy days
- 11 rainy days
- Sunshine
- 8.9 h sunshine / day
May
GoodHigh 19.6°C (67.3°F)
Low 10°C (50°F)
- Rainfall
- 90 mm (3.5 in)
- Rainy days
- 11 rainy days
- Sunshine
- 9.9 h sunshine / day
June
GoodHigh 24.5°C (76.1°F)
Low 15.2°C (59.4°F)
- Rainfall
- 97 mm (3.8 in)
- Rainy days
- 11 rainy days
- Sunshine
- 10.8 h sunshine / day
July
GoodHigh 28.3°C (82.9°F)
Low 19.2°C (66.6°F)
- Rainfall
- 101 mm (4 in)
- Rainy days
- 12 rainy days
- Sunshine
- 11.4 h sunshine / day
August
GoodHigh 27.1°C (80.8°F)
Low 18.1°C (64.6°F)
- Rainfall
- 87 mm (3.4 in)
- Rainy days
- 10 rainy days
- Sunshine
- 11 h sunshine / day
September
GreatHigh 23.1°C (73.6°F)
Low 14.6°C (58.3°F)
- Rainfall
- 92 mm (3.6 in)
- Rainy days
- 9 rainy days
- Sunshine
- 9.1 h sunshine / day
October
GoodHigh 16.9°C (62.4°F)
Low 8.9°C (48°F)
- Rainfall
- 110 mm (4.3 in)
- Rainy days
- 10 rainy days
- Sunshine
- 7.6 h sunshine / day
November
FairHigh 10.4°C (50.7°F)
Low 2.6°C (36.7°F)
- Rainfall
- 88 mm (3.5 in)
- Rainy days
- 9 rainy days
- Sunshine
- 6.4 h sunshine / day
December
PoorHigh 5.2°C (41.4°F)
Low -2.4°C (27.7°F)
- Rainfall
- 119 mm (4.7 in)
- Rainy days
- 11 rainy days
- Sunshine
- 5.6 h sunshine / day
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Based on 20 years of historical weather data (2006–2025) from Open-Meteo. Monthly averages, not a forecast.