Boston Climate by Month
Boston, Massachusetts, United States
Warm summers and cold winters, with rain spread through the year.
Warm summers and cold winters, with rain spread through the year: that's Boston's climate in short. July is the warmest month, with highs around 85°F (29°C); January is the coolest at 37°F (3°C), and nights dip to 20°F (-6°C). It gets 46 in (1167 mm) of rain a year, spread across the months.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 20°F(-6°C)
- Average low, January
- Rain per year
- 46 in(1167 mm)
- No clear rainy season
- Humidity
- 68%
- Sunniest: July
Best and worst months in Boston
Best for weatherSeptember is the best time for weather in Boston: highs near 76°F (24°C) and about 3.6 in (92 mm) of rain a month.
Least pleasantJanuary is the least pleasant month: it's the coldest, with highs of only 37°F (3°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Boston weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 37°F(3°C) | 20°F(-6°C) | 3.7 in(95 mm) | 74% | 1.6 |
| FebFebruary | 40°F(5°C) | 22°F(-6°C) | 3.2 in(82 mm) | 68% | 2.5 |
| MarMarch | 47°F(8°C) | 29°F(-2°C) | 4.7 in(119 mm) | 64% | 3.4 |
| AprApril | 58°F(15°C) | 38°F(3°C) | 3.9 in(100 mm) | 61% | 4.5 |
| MayMay | 70°F(21°C) | 48°F(9°C) | 3.2 in(82 mm) | 59% | 5.1 |
| JunJune | 79°F(26°C) | 58°F(14°C) | 3.7 in(94 mm) | 64% | 5.5 |
| JulJuly | 85°F(29°C) | 64°F(18°C) | 3.5 in(88 mm) | 66% | 5.6 |
| AugAugust | 83°F(29°C) | 63°F(17°C) | 3.6 in(91 mm) | 68% | 5.1 |
| SepSeptemberBest | 76°F(24°C) | 55°F(13°C) | 3.6 in(92 mm) | 70% | 3.9 |
| OctOctober | 64°F(18°C) | 44°F(6°C) | 4.5 in(114 mm) | 71% | 2.6 |
| NovNovember | 53°F(12°C) | 35°F(2°C) | 3.9 in(100 mm) | 72% | 1.7 |
| DecDecember | 43°F(6°C) | 26°F(-3°C) | 4.3 in(110 mm) | 74% | 1.3 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
Places with a similar climate
All 20 places like Boston →- 🇺🇸HartfordConnecticut, United States · Pop. 121k99%matchSame winter lowsSame summer highsBoston vs Hartford →
- 🇺🇸New HavenConnecticut, United States · Pop. 130k99%matchSame summer highsSame winter lowsBoston vs New Haven →
- 🇺🇸ParsippanyNew Jersey, United States · Pop. 51k99%matchSame winter lowsSame summer highsBoston vs Parsippany →
- 🇺🇸PoughkeepsieNew York, United States · Pop. 30k99%matchSame summer highsSame winter lowsBoston vs Poughkeepsie →
- 🇺🇸BridgeportConnecticut, United States · Pop. 148k99%matchSame summer highsSimilar rainfallBoston vs Bridgeport →