Porthmadog monthly weather averages

Average daytime temperature

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

Porthmadog average temperature chart (Celsius) Porthmadog average temperature chart (Fahrenheit)
Average monthly temperatures in Porthmadog (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 6.5 6.5 8.2 10.7 14 16.6 18 17.9 15.9 13.3 9.3 7.6
°F 43.8 43.6 46.7 51.3 57.1 61.8 64.5 64.3 60.6 55.9 48.8 45.6

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.

Porthmadog monthly rainfall chart (mm) Porthmadog monthly rainfall chart (inches)
Average monthly rainfall in Porthmadog (mm and inches)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
mm 180 122 141 99 96 98 101 135 151 184 198 202
inches 7.1 4.8 5.6 3.9 3.8 3.9 4 5.3 5.9 7.2 7.8 8
Rainy days 21 16 19 15 16 15 14 16 17 20 21 21

Average annual rainfall in Porthmadog: 1756.134mm (691.4 inches)

Average daily sunshine

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

Porthmadog average daily sunshine chart
Average daily sunshine Porthmadog
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Hrs sunshine 1.5 2.8 3.6 5.4 6.7 6.6 5.9 5.6 4.5 3.2 2 1.3

Day / night temperatures

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

Porthmadog average minimum / maximum temperatures (Celsius) Porthmadog average minimum / maximum temperatures (Fahrenheit)
Maximum and minimum daily temperatures in Porthmadog (degrees centigrade and fahrenheit)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 1.6 1.2 2.3 3.7 6.3 9.1 11 10.9 9.4 7.4 4 2.5
Max °C 6.7 6.6 8.3 10.9 14.2 16.8 18.2 18.1 16.1 13.5 9.5 7.7
Min °F 34.8 34.2 36.1 38.7 43.3 48.3 51.8 51.6 48.8 45.2 39.1 36.5
Max °F 39.4 39 41.5 45.1 50.4 55.2 58.3 58.1 54.9 50.7 44.1 41.2

Sea temperature

The graph below shows the average sea temperature.

Porthmadog average sea temperature chart (Celsius) Porthmadog average sea temperature chart (Fahrenheit)
Average sea temperature around Porthmadog in degrees centigrade and fahrenheit
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 8.9 8 7.9 8.8 10.7 13 15 15.9 15.6 14.3 12.5 10.5
°F 48 46.4 46.1 47.8 51.2 55.4 59 60.6 60.1 57.8 54.4 50.9

Wind speed

The graph below shows the average wind speed.

Porthmadog average winspeed by month (km/h) Porthmadog average winspeed by month (mph)
Average wind speed in Porthmadog (mph and kmh)
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
km/h 23 21 21 18 17 16 16 17 19 21 22 23
mph 14 13 13 11 11 10 10 10 12 13 14 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.

Porthmadog relative humidity averages
Average relative humidity in Porthmadog
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
88% 87% 86% 83% 81% 83% 85% 86% 87% 88% 89% 90%

Other monthly averages

UV index Best time to go?

Porthmadog weather stats

Porthmadog weather statistics
Hottest month: July 18°C 64.4°F
Driest month: May 96mm 3.8ins
Sunniest month: May 6.7hrs
Coldest month: February 6.5°C 43.7°F
Wettest month: December 202mm 8ins
Warmest sea: August 15.9°C 60.6°F
Map showing location of Porthmadog (52.92924, -4.13137) Porthmadog map pin © Google

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