Boston Weather in March

March is a transition month for weather in Boston, Massachusetts. The city sees the last of winter's major snowstorms and the first of the year's thunderstorms. While nighttime low temperatures often dip below freezing, the days do warm up noticeably during the month.

This page gives detailed information on the typical March temperature, precipitation, sun, humidity, wind and storms for Boston. The numbers here are historical averages based on climate data gathered at Boston's Logan International Airport, located on the waterfront next to Boston Harbor.

Temperature Weather iconTemperature

46 °F March average high 8 °C
31 °F March average low 0 °C
10 days 50 °F max. or more (10 °C)
16 days 32 °F min. or less (0 °C)

Boston averages just one day in March when the thermometer reaches into the 70s Fahrenheit (over 20 degrees Celsius). A March temperature above 80 °F (27 °C) is a once in a decade event. Typically on 2 days the mercury remains below freezing for the entire day.

At night, the thermometer dips to 20 °F (-8 °C) or below on 3 days. Every few years, March can get as cold as 10 °F (-12 °C).

Rainy Weather iconPrecipitation

4.2 in total precipitation 106 mm
12 days of rain or snowfall

Half the time, Boston receives 3.0 to 4.4 inches (76 to 113 mm) of precipitation in March. One in four years has drier weather, while another one in four is wetter.

Snowy Weather iconSnow

9.0 in total snowfall 23 cm
4 days with new snow

March's snowfall varies a lot from year to year in Boston. Between 1.6 and 13 inches (4 to 33 cm) of fresh snow arrives in half the years. Less new snow lands in one out of four Marches, while another twenty-five percent are snowier.

Sunny Weather iconSun

57 % sunshine
8 days clear skies

The sun's rays reach the ground in Boston during 57 percent of daylight hours on average in March, for a total of 211 hours in the month. Typically on 8 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in March at Boston lasts for 11 hours and 58 minutes a day on average. The shortest day of the month is the 1st with 11 hours and 15 minutes of daylight. By the end of the month, the days have lengthened to 12:42 from sunrise to sunset. These durations can vary by a minute or two from year to year.

Humid Weather iconHumidity

63 % March average humidity

The relative humidity in Boston during March usually peaks at 69 percent in the morning then drops to 56 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 67 69 69 60 56 56 62 65

Windy Weather iconWind

13.6 mph March wind speed average 21.9 kph

March is a little windier than most other months in Boston.

Stormy Weather iconStorms

1 day snowfall of 5 inches (13 cm) or more
1 day with thunderstorms in March

In March, Boston often sees the last of winter's substantial snowfalls plus the first thunderstorm of the year.


The weather data here are long-term averages provided by the US National Centers for Environmental Information (NCEI). Temperature and precipitation are 1991-2020 normals while humidity and thunderstorms are 1961-1990 normals.

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