Carmarthen monthly weather averages

Average daytime temperature

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

Carmarthen average temperature chart (Celsius) Carmarthen average temperature chart (Fahrenheit)
Average monthly temperatures in Carmarthen (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.8 6.8 8.5 11.2 14.1 16.9 18.6 18.4 16.4 13.5 9.7 7.8
°F 44.3 44.2 47.3 52.1 57.4 62.4 65.5 65.2 61.5 56.3 49.5 46.1

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.

Carmarthen monthly rainfall chart (mm) Carmarthen monthly rainfall chart (inches)
Average monthly rainfall in Carmarthen (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 154 101 112 84 84 87 86 112 127 156 154 162
inches 6.1 4 4.4 3.3 3.3 3.4 3.4 4.4 5 6.2 6.1 6.4
Rainy days 20 15 18 14 15 14 13 15 16 19 20 20

Average daily sunshine

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

Carmarthen average daily sunshine chart
Average daily sunshine Carmarthen
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.9 2.9 3.8 5.9 6.9 6.8 6.5 6 4.7 3.4 2.5 1.7

Day / night temperatures

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

Carmarthen average minimum / maximum temperatures (Celsius) Carmarthen average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Carmarthen (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 1.7 1.3 2.4 3.9 6.5 9.3 11.2 11.2 9.5 7.4 4 2.5
Max °C 7 6.9 8.7 11.4 14.3 17.1 18.8 18.6 16.6 13.7 9.9 8
Min °F 35 34.3 36.2 38.9 43.7 48.7 52.2 52.2 49 45.2 39.1 36.4
Max °F 39.7 39.4 41.9 45.7 50.7 55.8 59 58.8 55.4 50.9 44.4 41.4

Sea temperature

The graph below shows the average sea temperature.

Carmarthen average sea temperature chart (Celsius) Carmarthen average sea temperature chart (Fahrenheit)
Average sea temperature around Carmarthen in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9.7 8.8 8.6 9.4 11.1 13.3 15.3 16.2 15.9 14.6 12.8 11.2
°F 49.5 47.9 47.5 48.9 51.9 55.9 59.5 61.2 60.6 58.3 55.1 52.1

Wind speed

The graph below shows the average wind speed.

Carmarthen average winspeed by month (km/h) Carmarthen average winspeed by month (mph)
Average wind speed in Carmarthen (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 24 23 23 19 18 17 16 17 19 21 23 25
mph 15 14 14 12 11 10 10 11 12 13 15 15

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.

Carmarthen relative humidity averages
Average relative humidity in Carmarthen
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
91% 89% 87% 85% 84% 85% 86% 87% 89% 90% 90% 92%

Other monthly averages

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Carmarthen weather stats

Carmarthen weather statistics
Hottest month: July 18.6°C 65.5°F
Driest month: April 84mm 3.3ins
Sunniest month: May 6.9hrs
Coldest month: February 6.8°C 44.2°F
Wettest month: December 162mm 6.4ins
Warmest sea: August 16.2°C 61.2°F
Map showing location of Carmarthen (51.85552, -4.30535)

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