Boston (MA) monthly weather averages

  • Average daytime temperature

    The bar chart below shows the average monthly peak daytime temperatures at Boston

    Boston average temperature chart
    Average monthly temperatures in Boston (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 1.2 2.4 7.3 13.4 19.4 24.5 27.6 26.4 22.3 16.7 10.5 3.7
    °F 34.1 36.4 45.2 56 67 76.2 81.7 79.5 72.2 62.1 51 38.7

    Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.

  • Average rainfall & rainy days

    The graph below shows the average rainfall and number of rainy days per month.

    Average monthly rainfall in Boston (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 93 93 97 93 85 80 75 85 82 87 111 105
    inches 3.7 3.6 3.8 3.7 3.3 3.1 2.9 3.3 3.2 3.4 4.4 4.1
    Rainy days 11 10 11 11 11 11 9 10 9 9 11 12
  • Average daily sunshine

    The bar chart below shows the average daily sunshine hours in Boston

    Average daily sunshine Boston
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 5.8 6.5 7.2 7.9 8.9 9.9 10.2 9.4 8.3 7.1 5.2 5.1
  • Day / night temperatures

    The graph below shows the daily range of temperatures for each month.

    Maximum and minimum daily temperatures in Boston (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Min °C -7.6 -6.7 -1.8 3.4 8.7 13.8 17.2 16.4 12 6.4 1.9 -4.6
    Max °C 1.4 2.7 7.6 13.6 19.7 24.8 27.9 26.7 22.6 17 10.8 4
    Min °F 18.3 20 28.9 38.1 47.7 56.8 62.9 61.4 53.6 43.5 35.3 23.8
    Max °F 26.4 28.4 37.2 47.3 57.6 66.7 72.5 70.7 63.1 53.1 43.3 31.5
  • Sea temperature

    The graph below shows the average sea temperature.

    Average sea temperature around Boston in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 5.4 3.8 3.5 5.2 9.1 14 18.6 19.8 17.8 14.2 10.7 7.9
    °F 41.8 38.8 38.3 41.4 48.4 57.3 65.4 67.7 64.1 57.6 51.3 46.2
  • Wind speed

    The graph below shows the average wind speed.

    Average wind speed in Boston (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 19 19 19 19 17 16 15 14 15 16 18 18
    mph 12 12 12 12 11 10 9 9 9 10 11 11

    A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.

  • Relative humidity

    The graph below shows the average relative humidity.

    Average relative humidity in Boston
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    63% 63% 63% 62% 66% 69% 69% 72% 73% 70% 69% 66%
Boston

Other monthly averages

Boston weather stats

Boston weather statistics
Hottest month: July 27.6°C 81.7°F
Driest month: July 75mm 3ins
Sunniest month: July 10.2hrs
Coldest month: January 1.2°C 34.2°F
Wettest month: November 111mm 4.4ins
Warmest sea: August 19.8°C 67.6°F
Map showing location of Boston (42.35843, -71.05977)

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