Boston: Weather Guide & Climate
Complete month-by-month weather guide: Boston. Best time to visit: May, June, September, October. Plan your trip with detailed climate data.
☀️ Climate Overview
Boston has a Cool climate with average yearly highs of 15°C, lows of 8°C, and approximately 10 rainy days per month.
The best time to visit Boston is during May, June, September, October, when weather is pleasant and ideal for outdoor activities
Drier season: Jan–Nov Wetter season: Mar–Dec
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Air Quality
Hottest
Coldest
Driest Month
Windiest Month
24 km/h
March (gusts 47)
Sea Temp Range
3° – 20°C
Warmest water: August (20°C)
Forecast for your trip dates
Up to 14 days aheadWeather by Season
Spring
Mar–May
Summer
Jun–Aug
Autumn
Sep–Nov
Winter
Dec–Feb
Month-by-Month Weather Table
January
February
March
April
May
BestJune
BestJuly
August
September
BestOctober
BestNovember
December
| Month | High | Low | Rain | Sunshine | Humidity | UV Index | Crowds | Condition | View Details |
|---|---|---|---|---|---|---|---|---|---|
| January | 4°C | -3°C | 10d (104mm) | 5.8h | 67% Humid | 2.8 Moderate | | Good | View Details → |
| February | 5°C | -3°C | 8d (80mm) | 6.6h | 66% Humid | 4 Moderate | | Good | View Details → |
| March | 9°C | 1°C | 12d (113mm) | 7.9h | 64% Moderate | 5.7 High | | Good | View Details → |
| April | 13°C | 5°C | 11d (97mm) | 8.5h | 65% Humid | 6.9 High | | Good | View Details → |
| May (best) | 19°C | 11°C | 9d (84mm) | 10.4h | 69% Humid | 8.6 Very High | | Excellent | View Details → |
| June (best) | 24°C | 16°C | 10d (66mm) | 11h | 74% Humid | 8.8 Very High | | Excellent | View Details → |
| July | 27°C | 20°C | 11d (93mm) | 11h | 76% Humid | 8.4 Very High | | Good | View Details → |
| August | 26°C | 19°C | 10d (70mm) | 10.7h | 75% Humid | 7.6 Very High | | Good | View Details → |
| September (best) | 22°C | 15°C | 9d (98mm) | 8.7h | 77% Humid | 6 High | | Excellent | View Details → |
| October (best) | 17°C | 10°C | 8d (97mm) | 7.3h | 75% Humid | 4.3 Moderate | | Excellent | View Details → |
| November | 12°C | 4°C | 8d (69mm) | 7h | 67% Humid | 3.3 Moderate | | Good | View Details → |
| December | 6°C | -1°C | 11d (123mm) | 5.4h | 70% Humid | 2.3 Moderate | | Good | View Details → |
Boston
Freedom Trail history, Fenway Park, Ivy-league vibes across the Charles, seafood, and harbor charm.
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Frequently Asked Questions
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