Climate

Boston weather by month

Average highs, lows, rain and snow for every month, from 30 years of weather records.

Average temperatures

Best time to visit: May, July, August, when highs are mild and rain is lightest.

Month	High	Low	Rain	Snow	Wet days
January	37°F	23°F	3.4 in	14.3 in	12
February	39°F	25°F	3.2 in	14.4 in	11
March	46°F	31°F	4.2 in	9.0 in	12
April	56°F	41°F	3.6 in	1.6 in	12
May	67°F	50°F	3.2 in	0.00 in	12
June	76°F	60°F	3.9 in	0.00 in	11
July	82°F	66°F	3.3 in	0.00 in	9
August	80°F	65°F	3.2 in	0.00 in	9
September	73°F	58°F	3.6 in	0.00 in	9
October	62°F	48°F	4.0 in	0.20 in	11
November	52°F	38°F	3.7 in	0.70 in	10
December	42°F	29°F	4.3 in	9.0 in	12

NOAA U.S. Climate Normals 1991–2020, Boston Logan Intl Ap, Ma Us (1.9 mi away, 12 ft). Wet days: days with at least 0.01 in of precipitation.

What is the hottest month in Boston?

July, with an average high of 82°F and low of 66°F.

What is the coldest month in Boston?

January, with an average low of 23°F and high of 37°F.

When does it rain most in Boston?

December is the wettest month, averaging 4.3 in of precipitation; the year totals about 43.6 inches.

Does it snow in Boston?

Yes. Snowfall averages about 49 inches a year, mostly in February and January.

What is the best time to visit Boston?

For mild weather (highs between 65°F and 85°F) with the least rain, May, July, August.

Where do these numbers come from?

NOAA’s 1991–2020 U.S. Climate Normals for the Boston Logan Intl Ap weather station, 1.9 miles from downtown: 30-year averages, not a forecast.