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Best time to visit · Massachusetts, United States
For the most comfortable weather in Boston, aim for May and July – October. September tops our comfort score at 83/100, with highs around 75°F (24°C) and 3.6 in (92 mm) of rain. April and June are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
These averages also cover Downtown Boston & the Waterfront and South Boston & Castle Island.
Highs run from 34°F to 82°F across the year, and the yearly total is about 47.5 in (1207 mm) of rain and snow.
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high | 34°F1°C | 36°F2°C | 43°F6°C | 56°F13°C | 66°F19°C | 75°F24°C | 82°F28°C | 82°F28°C | 75°F24°C | 62°F17°C | 50°F10°C | 39°F4°C |
| Avg low | 19°F-7°C | 20°F-6°C | 27°F-3°C | 37°F3°C | 47°F9°C | 57°F14°C | 64°F18°C | 63°F17°C | 56°F13°C | 45°F7°C | 35°F1°C | 26°F-3°C |
| Rain/snow | 3.1 in80 mm | 3.4 in86 mm | 4.3 in110 mm | 4.2 in107 mm | 3.7 in95 mm | 4.4 in113 mm | 3.7 in94 mm | 3.7 in93 mm | 3.6 in92 mm | 4.8 in123 mm | 3.9 in98 mm | 4.6 in116 mm |
| Humidity | 88% | 87% | 82% | 79% | 79% | 79% | 75% | 73% | 75% | 79% | 82% | 86% |
| Cloud | 62% | 61% | 61% | 61% | 64% | 62% | 55% | 53% | 51% | 59% | 60% | 63% |
| Comfort | 45 | 44 | 46 | 67 | 82 | 74 | 77 | 81 | 83 | 77 | 59 | 40 |
Source: NASA POWER (public domain), 2001–2025 monthly averages on a ~50 km satellite and reanalysis grid, so coasts and valleys can differ from what's shown. The grid cell sits at about 71 m (233 ft), close to Boston's own ~11 m. Precipitation includes snow as melted water; daylight is calculated from latitude. Check a forecast before you go.
The coldest season, with highs of 34–39°F (1–4°C) and lows down to 19°F (-7°C). It's the driest season, with only about 11.1 in (282 mm) of rain or snow, 23% of the year's total. December – February are cold enough for snow. Comfort scores bottom out in December – February; the season averages 43/100.
Temperatures climb through the season, from 43°F highs in March to 66°F by May. About 12.3 in (312 mm) of rain or snow falls across these months, 26% of the year's total. March is cold enough for snow. Comfort peaks here: May ranks with the year's best, and the season averages 65/100.
The warmest stretch of the year, with highs of 75–82°F (24–28°C). About 11.8 in (300 mm) of rain falls across these months, 25% of the year's total. July feels humid, with humidity near 75%. July & August are among the best-scoring months (season average 77/100).
Temperatures slide from 75°F highs in September to 50°F by November. It's the wettest season, with about 12.3 in (313 mm) of rain, 26% of the year's total. Lows bottom out around 35°F (1°C). Comfort peaks here: September & October rank with the year's best, and the season averages 73/100.
By comfort score: 5 Great, 2 Good, 3 Fair and 2 Tough. Great months: May and July – October. Tap a month for its own guide.
For the most comfortable weather in Boston, aim for May and July – October. September tops our comfort score at 83/100, with highs around 75°F (24°C) and 3.6 in (92 mm) of rain. April and June are good shoulder-season months. The toughest months are December – February, mainly because of cool days.
October is the wettest month, averaging about 4.8 in (123 mm) of rain. January is the driest, with about 3.1 in (80 mm). The yearly total is around 47.5 in (1207 mm).
January is the coldest, with average lows of 19°F (-7°C) and highs of 34°F (1°C). The warmest is July, with average highs of 82°F (28°C).
Yes: in July humidity averages 75% with warm temperatures, so it feels muggy. Summer highs peak around 82°F (28°C).
On average, yes: lows fall below 32°F (0°C) in December – March, bottoming out around 19°F (-7°C) in January.
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