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Boston, MA Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Boston, MA?
Boston, MA gets 43.6 in of precipitation a year over about 128 rainy days, and about 49.2 in of snow a season. July is the warmest month (average high 82°F) and January the coldest (average low 23°F).
Humid continental climate
Boston, MA has warm summers and cold winters. Daytime highs range from about 37°F in January to 82°F in July. December is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 70°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 26° | 40° |
| Spring | Mar–May | 41° | 56° |
| Summer | Jun–Aug | 64° | 80° |
| Autumn | Sep–Nov | 48° | 63° |
How much rain does Boston get?
Boston gets 43.6 in of precipitation in an average year, spread over about 128 days with measurable rain. That is more rainy days than 84% of the US.
December is the wettest month, with 4.3 in. February is the driest, with 3.2 in. December has the most rainy days, about 12.
The longest dry spell in the last five years lasted 29 days, to September 18, 2024.
From September 2025 to August 2026 Boston got 35.9 in of rain, against a normal of 43.6 in for those months. October 2025 had the most, with 5.0 in.
See where Boston ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Massachusetts.
Does it snow in Boston?
Yes. Boston gets about 49.2 in of snow in an average season, measured at the reporting station.
The snowiest winter on record is 2014–15, with 110.6 in.
The most recent measurable snow at the station fell on March 24, 2026.
From September 2025 to August 2026 the station measured 62.8 in of snow, against a normal of 49.2 in for those months. January 2026 had the most, with 29.8 in.
See where Boston ranks: snowiest cities in the US.
Boston weather by month
Boston weather in January
In January, Boston averages a high of 37°F and a low of 23°F. It gets 3.4 in of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The January record high is 74°F (2020) and the record low is -7°F (2004).
Boston weather in February
In February, Boston averages a high of 39°F and a low of 25°F. It gets 3.2 in of precipitation over about 11 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The February record high is 73°F (2017) and the record low is -10°F (2023).
Boston weather in March
In March, Boston averages a high of 46°F and a low of 31°F. It gets 4.2 in of precipitation over about 12 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The March record high is 89°F (1998) and the record low is 5°F (2007).
Boston weather in April
In April, Boston averages a high of 57°F and a low of 41°F. It gets 3.6 in of precipitation over about 12 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The April record high is 94°F (1976) and the record low is 16°F (1982).
Boston weather in May
In May, Boston averages a high of 66°F and a low of 50°F. It gets 3.3 in of precipitation over about 12 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The May record high is 96°F (2026) and the record low is 34°F (2020). May is one of the most comfortable months to visit.
Boston weather in June
In June, Boston averages a high of 76°F and a low of 60°F. It gets 3.9 in of precipitation over about 11 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The June record high is 102°F (2025) and the record low is 45°F (1986). June is one of the most comfortable months to visit.
Boston weather in July
In July, Boston averages a high of 82°F and a low of 66°F. It gets 3.3 in of precipitation over about 9 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The July record high is 103°F (2011) and the record low is 50°F (1988).
Boston weather in August
In August, Boston averages a high of 80°F and a low of 65°F. It gets 3.2 in of precipitation over about 9 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The August record high is 102°F (1975) and the record low is 47°F (1986).
Boston weather in September
In September, Boston averages a high of 73°F and a low of 58°F. It gets 3.6 in of precipitation over about 9 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The September record high is 99°F (1983) and the record low is 38°F (2000). September is one of the most comfortable months to visit.
Boston weather in October
In October, Boston averages a high of 62°F and a low of 48°F. It gets 4.0 in of precipitation over about 11 rainy days. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. The October record high is 87°F (2011) and the record low is 28°F (1976). October is one of the most comfortable months to visit.
Boston weather in November
In November, Boston averages a high of 52°F and a low of 38°F. It gets 3.7 in of precipitation over about 10 rainy days. Estimated sunshine is 59% of daylight hours, derived from ERA5 cloud cover. The November record high is 82°F (2024) and the record low is 14°F (2018).
Boston weather in December
In December, Boston averages a high of 43°F and a low of 29°F. It gets 4.3 in of precipitation over about 12 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The December record high is 76°F (1998) and the record low is -7°F (1980).
Sunshine, humidity and wind in Boston
November is the sunniest month in Boston, with estimated sunshine of 59% of daylight hours from ERA5 cloud cover. April is the cloudiest, at 38%. The annual cloud-cover estimate is 43% of daylight hours; it is not a measurement of sunshine duration. Boston is cloudier than 71% of the US.
Humidity peaks in September at 75% and is lowest in March at 60%.
Wind averages 11 mph over the year, and March is the windiest month at 13 mph.
Boston has about 14 days a year above 90°F. Boston is cooler than 70% of the US.
Thunderstorms occur on about 17 days a year.
See where Boston ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Boston
The first fall freeze in Boston typically comes around November 9, and the last spring freeze around April 6. That leaves a frost-free growing season of about 217 days.
Boston weather records
These records cover BOSTON during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Boston station is 103°F, on July 22, 2011. The coldest is -10°F, on February 4, 2023.
The wettest day in the available station history brought 6.1 in of precipitation, on October 20, 1996.
39 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.4°F per decade since 1970.
The best time to visit Boston
The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 70°F.
Winter (December–February) is cold, with average highs around 40°F and lows near 26°F. Snow is possible.
Spring (March–May) is mild, with average highs around 56°F and lows near 41°F.
Summer (June–August) is warm, with average highs around 80°F and lows near 64°F. It can feel humid.
Autumn (September–November) is mild, with average highs around 63°F and lows near 48°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 23° | 37° | 3.4 in | 12 | 12 mph | 67% | 39% | 74° | -7° |
| February | 25° | 39° | 3.2 in | 11 | 12 mph | 64% | 42% | 73° | -10° |
| March | 31° | 46° | 4.2 in | 12 | 13 mph | 60% | 42% | 89° | 5° |
| April | 41° | 57° | 3.6 in | 12 | 12 mph | 62% | 38% | 94° | 16° |
| May | 50° | 66° | 3.3 in | 12 | 11 mph | 64% | 42% | 96° | 34° |
| June | 60° | 76° | 3.9 in | 11 | 10 mph | 72% | 41% | 102° | 45° |
| July | 66° | 82° | 3.3 in | 9 | 10 mph | 74% | 40% | 103° | 50° |
| August | 65° | 80° | 3.2 in | 9 | 10 mph | 74% | 41% | 102° | 47° |
| September | 58° | 73° | 3.6 in | 9 | 10 mph | 75% | 46% | 99° | 38° |
| October | 48° | 62° | 4.0 in | 11 | 11 mph | 74% | 48% | 87° | 28° |
| November | 38° | 52° | 3.7 in | 10 | 11 mph | 65% | 59% | 82° | 14° |
| December | 29° | 43° | 4.3 in | 12 | 12 mph | 69% | 43% | 76° | -7° |
Station: BOSTON, 4 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Boston climate questions
How much rain does Boston get?
Boston gets 43.6 in of precipitation in an average year, over about 128 rainy days.
What is the wettest month in Boston?
December is the wettest month in Boston, with 4.3 in. February is the driest, with 3.2 in.
How many rainy days does Boston have a year?
Boston has about 128 days with measurable rain in an average year. December has the most, about 12.
Does it snow in Boston?
Yes. Boston gets about 49.2 in of snow in an average season. The snowiest winter on record is 2014–15, with 110.6 in.
What is the hottest month in Boston?
July is the warmest month in Boston, with an average high of 82°F.
What is the coldest month in Boston?
January is the coldest month in Boston, with an average low of 23°F.
What is the record high temperature in Boston?
Within the available 1970–2026 station history, the record high at the Boston station is 103°F, set on July 22, 2011. The record low is -10°F, on February 4, 2023.
What is the sunniest month in Boston?
November is the sunniest month in Boston, with estimated sunshine of 59% of daylight hours from ERA5 cloud cover. April is the cloudiest.
When is the first frost in Boston?
The first fall freeze in Boston typically comes around November 9. The last spring freeze is around April 6.
What is the best time to visit Boston?
The most comfortable time to visit is typically May to June and September to October, when daytime highs sit near 70°F.