United States · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Boston are May, June and September, when daytime temperatures are agreeable and rainfall is relatively low.
Boston sees its warmest weather in July, when daytime highs average around 28°C, and its coolest in January (around 3°C).
Annual precipitation totals roughly 1107mm — December is typically the wettest month (~109mm) and February the driest (~82mm).
Rainfall is spread fairly evenly through the year, so no single season is dramatically wetter than the rest.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 61 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 3° / -5°C | 86mm | 🤔 Fair |
| February | 4° / -4°C | 82mm | 🤔 Fair |
| March | 8° / 0°C | 106mm | ⚠️ Challenging |
| April | 14° / 5°C | 92mm | 🤔 Fair |
| May | 19° / 10°C | 83mm | 👍 Good |
| June | 25° / 15°C | 99mm | 🌟 Great |
| July | 28° / 19°C | 83mm | 👍 Good |
| August | 27° / 18°C | 82mm | 👍 Good |
| September | 23° / 15°C | 90mm | 🌟 Great |
| October | 17° / 9°C | 102mm | 👍 Good |
| November | 11° / 3°C | 93mm | 🤔 Fair |
| December | 6° / -1°C | 109mm | ⚠️ Challenging |
January in Boston is cold, with average daytime highs around 3°C (37°F) and nighttime lows near -5°C (23°F). Expect roughly 86mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
🎒 What to pack — warm coat · sweaters and layers · scarf
February in Boston is cold, with average daytime highs around 4°C (39°F) and nighttime lows near -4°C (25°F). Expect roughly 82mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
🎒 What to pack — warm coat · sweaters and layers · scarf
March in Boston is cold, with average daytime highs around 8°C (46°F) and nighttime lows near 0°C (31°F). Expect roughly 106mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
🎒 What to pack — warm coat · sweaters and layers · scarf
April in Boston is chilly, with average daytime highs around 14°C (56°F) and nighttime lows near 5°C (41°F). Expect roughly 92mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
🎒 What to pack — jacket or coat · long-sleeve layers
May in Boston is pleasantly warm, with average daytime highs around 19°C (67°F) and nighttime lows near 10°C (50°F). Expect roughly 83mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
🎒 What to pack — light layers · comfortable walking shoes
June in Boston is pleasantly warm, with average daytime highs around 25°C (76°F) and nighttime lows near 15°C (60°F). Expect roughly 99mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
🎒 What to pack — light layers · comfortable walking shoes
July in Boston is warm, with average daytime highs around 28°C (82°F) and nighttime lows near 19°C (66°F). Expect roughly 83mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
August in Boston is warm, with average daytime highs around 27°C (80°F) and nighttime lows near 18°C (65°F). Expect roughly 82mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
September in Boston is pleasantly warm, with average daytime highs around 23°C (73°F) and nighttime lows near 15°C (58°F). Expect roughly 90mm of precipitation spread over about 7 rainy days, with a moderate amount of rain.
🎒 What to pack — light layers · comfortable walking shoes
October in Boston is mild, with average daytime highs around 17°C (62°F) and nighttime lows near 9°C (47°F). Expect roughly 102mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
🎒 What to pack — light jacket · layers for cool evenings
November in Boston is chilly, with average daytime highs around 11°C (52°F) and nighttime lows near 3°C (38°F). Expect roughly 93mm of precipitation spread over about 8 rainy days, with a moderate amount of rain.
🎒 What to pack — jacket or coat · long-sleeve layers
December in Boston is cold, with average daytime highs around 6°C (42°F) and nighttime lows near -1°C (29°F). Expect roughly 109mm of precipitation spread over about 9 rainy days, with a moderate amount of rain.
🎒 What to pack — warm coat · sweaters and layers · scarf