Boston, MA Weather
Boston hourly forecast: next 24 hours
Today's high of 87°F (30°C) is about 4°F (2°C) above the typical July high of 83°F (28°C).
Current conditions in detail
Boston weather tomorrow (Saturday, July 18)
Tomorrow in Boston looks sunny, with a high of 90° and an overnight low of 62°. There is a 58% chance of rain - plan accordingly. Winds top out near 19 mph, and the UV index reaches 5 (moderate).
Boston 14-day forecast
About the weather in Boston
Boston has a humid subtropical climate, marked by hot, humid summers and generally mild winters. Average daytime highs range from about 37°F (3°C) in January to around 83°F (28°C) in July, and the city records roughly 127 days of measurable precipitation a year.
Boston weather: quick facts
- Hottest month: July - highs near 83°F (28°C)
- Coldest month: January - highs near 37°F (3°C)
- Record high: 101°F (39°C) · Record low: -16°F (-26°C) (2015–2024)
- Wettest month: December (11 rainy days) · Sunniest: July (11.4 h sun/day)
- Climate type: humid subtropical - hot, humid summers and generally mild winters
- Snow: about 16 days a year
Temperatures through the year
The warmest stretch of the year centers on July. Highs average 83°F (28°C) and overnight lows stay near 66°F (19°C). The coolest month is January, with typical highs of 37°F (3°C) and lows around 23°F (-5°C). Based on 2015–2024 weather data, temperatures have reached as high as 101°F (39°C) and dropped as low as -16°F (-26°C).
Rain, sun and snow
December is usually the wettest month. It brings about 4.7 inches (120 mm) of rain over 11 days, while August is the driest. July brings the most sunshine, averaging 11.4 hours of sun a day. Snow falls on about 16 days in a typical year, mostly from December through April.
Season by season
Spring (March through May)
Spring in Boston stays on the cool side of mild, with daytime highs averaging 56°F (13°C) and nights around 39°F (4°C); expect showers on roughly 35 days across the season, plus around 4 snowy days.
Summer (June through August)
Summer in Boston is mild and warm, with daytime highs averaging 81°F (27°C) and nights around 64°F (18°C); expect showers on roughly 34 days across the season.
Fall (September through November)
Fall in Boston is crisp but comfortable, with daytime highs averaging 63°F (17°C) and nights around 48°F (9°C); expect showers on roughly 27 days across the season.
Winter (December through February)
Winter in Boston is chilly, with daytime highs averaging 40°F (4°C) and nights around 24°F (-4°C); expect showers on roughly 31 days across the season, plus around 11 snowy days.
Average temperatures in Boston by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 37° | 23° | 10 | 4.2 in | 6.0 h/day | 67% |
| February | 40° | 22° | 10 | 3.5 in | 6.7 h/day | 69% |
| March | 46° | 29° | 12 | 4.3 in | 7.9 h/day | 67% |
| April | 56° | 39° | 12 | 4.2 in | 8.4 h/day | 69% |
| May | 67° | 49° | 11 | 3.1 in | 10.2 h/day | 70% |
| June | 77° | 59° | 11 | 3.4 in | 11.2 h/day | 71% |
| July | 83° | 66° | 12 | 4.3 in | 11.4 h/day | 72% |
| August | 82° | 65° | 11 | 2.9 in | 10.9 h/day | 73% |
| September | 74° | 59° | 9 | 4.3 in | 8.9 h/day | 75% |
| October | 63° | 48° | 10 | 4.7 in | 7.5 h/day | 76% |
| November | 51° | 36° | 8 | 3.3 in | 6.6 h/day | 71% |
| December | 42° | 28° | 11 | 4.7 in | 5.7 h/day | 73% |