Belfast monthly weather averages

Average daytime temperature

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

Belfast average temperature chart (Celsius) Belfast average temperature chart (Fahrenheit)
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.

Belfast monthly rainfall chart (mm) Belfast monthly rainfall chart (inches)
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

Belfast average daily sunshine chart
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 3.3 2.4 1.6

Day / night temperatures

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

Belfast average minimum / maximum temperatures (Celsius) Belfast average minimum / maximum temperatures (Fahrenheit)
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.

Belfast average sea temperature chart (Celsius) Belfast average sea temperature chart (Fahrenheit)
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.

Belfast average winspeed by month (km/h) Belfast average winspeed by month (mph)
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.

Belfast relative humidity averages
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%
Belfast

Other monthly averages

UV index Best time to go?

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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