Boston Weather in June

June sees the beginning of hot weather in Boston, Massachusetts. Yet the city's sea breezes help spare most afternoons from excessive heat. The summer weather also brings an increase in thunderstorm activity.

This page gives detailed information on the typical June 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

76 °F June average high 25 °C
60 °F June average low 15 °C
12 days 80 °F max. or more (27 °C)
17 days 60 °F min. or less (16 °C)

Nearly every day in June warms to over 60 degrees Fahrenheit (16 degrees Celsius) in Boston. The city averages 3 days this month when the thermometer reaches into the 90s °F (over 32 °C), the first 90-degree weather of the year. Temperatures above 100 °F (38 °C) are not expected here during June.

The thermometer dips into the 40s F (below 10 °C) on an average of two nights this month.

Rainy Weather iconRain

3.9 in total precipitation 99 mm
11 days of rain

Half the time, it rains 1.8 to 4.8 inches (46 to 123 mm) in June. One in four years has drier weather, while another one in four is wetter. None of the precipitation falls as snow.

Sunny Weather iconSun

63 % sunshine
7 days clear skies

The sun's rays reach the ground in Boston during 63 percent of daylight hours on average in June, for a total of 287 hours in the month. Typically on 7 days this month the sky is mainly clear, with at most 30 percent cloud cover.

Sunlight in June at Boston lasts for 15 hours and 13 minutes a day on average. The longest days of the year, from around June 18th to 23rd, last 15 hours and 17 minutes from sunrise to sunset.

Humid Weather iconHumidity

69 % June average humidity

The relative humidity in Boston during June usually peaks at 80 percent in the morning then drops to 58 percent by early afternoon.

Local Time1 am4 am7 am10 am1 pm4 pm7 pm10 pm
Humidity % 77 80 73 62 58 59 66 73

Windy Weather iconWind

11.2 mph June wind speed average 18.0 kph

Boston's sea breeze usually keeps afternoon temperatures from getting overly hot in areas near the coast.

Stormy Weather iconStorms

3 days rainfall of 0.5 inches (13 mm) or more
4 days with thunderstorms in June
2 % chance a named storm approaches

While there's a two percent probability that a named tropical storm will approach within 100 miles (165 km) of Boston during June, it's unlikely that any storm in the area will be as severe as a hurricane.


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. The named storm probabilities come from the Atlantic Oceanographic and Meteorological Laboratory, Hurricane Research Division.

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