Porthmadog Weather & Climate: Best Time to Visit

The climate in Porthmadog experiences moderate temperature changes, with mild shifts between seasons. Average maximum daytime temperatures range from a pleasant 19°C (66°F) in July, the warmest time of the year, to a chilly 8°C (46°F) during cooler months like February.

At night, you can expect temperatures ranging from 12°C (54°F) in July to around 3°C (37°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

Porthmadog experiences significant rainfall throughout the year, averaging 1527 mm (60 in) of precipitation annually. While rainfall varies throughout the year, each season offers its own charm. December brings wetter days averaging 171 mm (6.7 in) of precipitation, spread over 21 rainy days.

In contrast, the driest month May experiences a drier climate, with about 95 mm (3.7 in) of rainfall spread across 16 rainy days. For more details, please visit our Porthmadog Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Porthmadog. While May receives considerable daily sunshine with up to 5.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 0.9 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine