Cardiff monthly weather averages

Average daytime temperature

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

Cardiff average temperature chart (Celsius) Cardiff average temperature chart (Fahrenheit)
Average monthly temperatures in Cardiff (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 7.2 7.2 9.4 12.1 15.3 18.3 20.2 20 17.7 14.3 10.3 8.2
°F 44.9 44.9 48.9 53.7 59.5 64.9 68.3 67.9 63.8 57.7 50.6 46.7

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.

Cardiff monthly rainfall chart (mm) Cardiff monthly rainfall chart (inches)
Average monthly rainfall in Cardiff (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 104 76 79 60 65 65 67 81 91 101 105 109
inches 4.1 3 3.1 2.4 2.6 2.5 2.6 3.2 3.6 4 4.1 4.3
Rainy days 20 15 17 15 15 14 13 15 15 18 18 19

Average daily sunshine

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

Cardiff average daily sunshine chart
Average daily sunshine Cardiff
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.9 2.8 4.1 5.9 6.9 7.4 6.9 6.6 5.2 3.4 2.7 1.8

Day / night temperatures

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

Cardiff average minimum / maximum temperatures (Celsius) Cardiff average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Cardiff (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 2.1 1.7 2.9 4.4 7.2 10.2 12.1 12.1 10.4 8 4.6 2.9
Max °C 7.3 7.3 9.6 12.3 15.5 18.5 20.4 20.2 17.9 14.5 10.5 8.3
Min °F 35.8 35.1 37.1 39.8 44.9 50.3 53.7 53.7 50.6 46.3 40.2 37.2
Max °F 40.5 40.1 43.2 46.9 52.3 57.7 61.2 61 57.4 52.2 45.5 42.1

Sea temperature

The graph below shows the average sea temperature.

Cardiff average sea temperature chart (Celsius) Cardiff average sea temperature chart (Fahrenheit)
Average sea temperature around Cardiff in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 10.2 9.3 9.2 9.9 11.2 13.1 15.1 16.2 16.1 14.9 13.3 11.6
°F 50.3 48.8 48.6 49.8 52.2 55.6 59.1 61.2 60.9 58.8 55.9 52.9

Wind speed

The graph below shows the average wind speed.

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

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.

Cardiff relative humidity averages
Average relative humidity in Cardiff
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
91% 88% 85% 82% 82% 82% 83% 83% 86% 89% 89% 92%
Cardiff

Other monthly averages

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Cardiff weather stats

Cardiff weather statistics
Hottest month: July 20.2°C 68.4°F
Driest month: April 60mm 2.4ins
Sunniest month: August 6.6hrs
Coldest month: February 7.2°C 45°F
Wettest month: December 109mm 4.3ins
Warmest sea: August 16.2°C 61.2°F
Map showing location of Cardiff (51.48, -3.18)

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