Merthyr Tydfil monthly weather averages

Contents

Average daytime temperature

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

Merthyr Tydfil average temperature chart (Celsius) Merthyr Tydfil average temperature chart (Fahrenheit)
Average monthly temperatures in Merthyr Tydfil (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 5.4 5.2 7.5 10.3 13.6 16.5 18.3 18 15.6 12.4 8.3 6.4
°F 41.7 41.4 45.4 50.5 56.5 61.7 65 64.4 60.1 54.3 47 43.6

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.

Merthyr Tydfil monthly rainfall chart (mm) Merthyr Tydfil monthly rainfall chart (inches)
Average monthly rainfall in Merthyr Tydfil (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 199 137 144 104 106 96 93 123 146 176 182 212
inches 7.8 5.4 5.7 4.1 4.2 3.8 3.7 4.9 5.7 6.9 7.1 8.4
Rainy days 21 16 19 16 16 16 14 16 17 20 20 21

Average annual rainfall in Merthyr Tydfil: 1766.033mm (695.3 inches)

Average daily sunshine

The bar chart below shows the average daily sunshine hours in Merthyr Tydfil

Merthyr Tydfil average daily sunshine chart
Average daily sunshine Merthyr Tydfil
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.6 2.5 3.6 5.2 6.1 6.6 6 5.8 4.6 3.2 2.4 1.6

Day / night temperatures

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

Merthyr Tydfil average minimum / maximum temperatures (Celsius) Merthyr Tydfil average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Merthyr Tydfil (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 0.7 0.3 1.4 3 5.8 8.7 10.5 10.6 8.8 6.7 3.2 1.7
Max °C 5.5 5.4 7.6 10.5 13.8 16.7 18.5 18.2 15.8 12.6 8.5 6.6
Min °F 33.3 32.5 34.5 37.3 42.4 47.7 50.9 51.1 47.8 44 37.7 35
Max °F 37.6 37 40.1 44.1 49.6 54.9 58.1 57.9 54.1 49.3 42.4 39.4

Sea temperature

The graph below shows the average sea temperature.

Merthyr Tydfil average sea temperature chart (Celsius) Merthyr Tydfil average sea temperature chart (Fahrenheit)
Average sea temperature around Merthyr Tydfil 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.

Merthyr Tydfil average winspeed by month (km/h) Merthyr Tydfil average winspeed by month (mph)
Average wind speed in Merthyr Tydfil (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 21 20 20 18 17 16 16 16 17 18 20 21
mph 13 12 12 11 11 10 10 10 11 11 12 13

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.

Merthyr Tydfil relative humidity averages
Average relative humidity in Merthyr Tydfil
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
92% 91% 87% 84% 83% 85% 85% 86% 89% 91% 92% 93%

Other monthly averages

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Merthyr Tydfil weather stats

Merthyr Tydfil weather statistics
Hottest month: July 18.3°C 64.9°F
Driest month: July 93mm 3.7ins
Sunniest month: June 6.6hrs
Coldest month: February 5.2°C 41.4°F
Wettest month: December 212mm 8.3ins
Warmest sea: August 16.2°C 61.2°F
Map showing location of Merthyr Tydfil (51.74794, -3.37779) Merthyr Tydfil map pin © Google

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