Belfast monthly weather averages

  • Average daytime temperature

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

    Belfast average temperature chart
    Average monthly temperatures in Belfast (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 6.7 6.8 8.7 11.1 13.8 16.8 18.2 17.9 15.7 12.9 9 7.5
    °F 44.1 44.2 47.7 51.9 56.9 62.2 64.8 64.2 60.3 55.2 48.1 45.5

    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 Belfast (mm and inches)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    mm 101 71 78 63 65 68 63 89 94 100 96 94
    inches 4 2.8 3.1 2.5 2.6 2.7 2.5 3.5 3.7 3.9 3.8 3.7
    Rainy days 20 16 19 15 16 15 15 17 17 19 19 20
  • Average daily sunshine

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

    Average daily sunshine Belfast
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Hrs sunshine 1.9 2.7 3.6 5.5 6.5 6.4 5.5 5.2 4.2 3.2 2.4 1.6
  • Day / night temperatures

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

    Maximum and minimum daily temperatures in Belfast (degrees centigrade and fahrenheit)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    Min °C 1.6 1.5 2.4 3.8 6 8.9 10.6 10.6 8.9 7 3.5 2.4
    Max °C 6.9 6.9 8.9 11.3 14 17 18.4 18.1 15.9 13.1 9.1 7.6
    Min °F 34.8 34.7 36.2 38.8 42.8 47.9 51.1 51 48 44.5 38.3 36.3
    Max °F 39.6 39.6 42.1 45.5 50 55.2 58.1 57.7 54.3 50 43.3 41
  • Sea temperature

    The graph below shows the average sea temperature.

    Average sea temperature around Belfast in degrees centigrade and fahrenheit
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    °C 8.3 7.2 7.1 8.1 10 12.2 14 14.9 14.7 13.7 12 10.1
    °F 47 45 44.8 46.6 49.9 53.9 57.2 58.8 58.5 56.7 53.6 50.2
  • Wind speed

    The graph below shows the average wind speed.

    Average wind speed in Belfast (mph and kmh)
      Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    km/h 23 22 22 19 18 17 17 17 19 21 21 22
    mph 15 14 14 12 11 11 11 11 12 13 13 14

    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 Belfast
    Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
    91% 88% 86% 84% 83% 84% 85% 86% 88% 90% 91% 91%

Other monthly averages

Belfast weather stats

Belfast weather statistics
Hottest month: July 18.2°C 64.8°F
Driest month: April 63mm 2.5ins
Sunniest month: May 6.5hrs
Coldest month: January 6.7°C 44.1°F
Wettest month: January 101mm 4ins
Warmest sea: August 14.9°C 58.8°F
Map showing location of Belfast (54.58333, -5.93333)

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