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Porthmadog Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Porthmadog.
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Climate overview of Porthmadog
The climate in Porthmadog, Gwynedd, United Kingdom, sees a moderate range of temperatures across the year, from 19°C (66°F) in July down to 8°C (46°F) in January.
Rainfall is high, totalling around 1527 mm (60 in) per year. December is the wettest month and May the driest. The city also experiences pleasant summers and cold winters. The most sunshine falls in May, with an average of 5.6 hours of daily sunshine.
Porthmadog Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Porthmadog - and find the best time to visit.
Monthly Temperature in Porthmadog
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 January.
At night, you can expect temperatures ranging from 12°C (54°F) in July to around 3°C (37°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Porthmadog
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
Sunshine Hours in Porthmadog
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
Data from: Bala, the United Kingdom (35 KM, 22 Miles).
Daily hours of sunshine
Data from: Bala, the United Kingdom (35 KM, 22 Miles).
Best Time to Visit Porthmadog
Compared with the rest of the year, the most comfortable conditions in Porthmadog are usually found in May, July and August. Conditions are generally least comfortable in January, February, March, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
wet
Feb
wet
Mar
wet
Apr
mixed
May
good
Jun
mixed
Jul
good
Aug
good
Sep
mixed
Oct
mixed
Nov
wet
Dec
wet
- Best overall: May, July and August
- Warmest weather: June, July, August and September
- Most sunshine: May
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Porthmadog
What is the best time to visit Porthmadog?
May, July and August typically offer the most optimal weather in Porthmadog. In contrast, January, February, March, November and December tend to have less optimal conditions. Porthmadog has pleasant summers and cold winters.
What temperatures can I expect in Porthmadog?
Daytime highs range from 8°C (46°F) in January to 19°C (66°F) in July. Nighttime lows range from 3°C (37°F) to 12°C (54°F).
How much rain does Porthmadog get?
Annual rainfall is around 1527 mm (60 in). December is the wettest month with 171 mm (6.7 in), while May is the driest with 95 mm (3.7 in).
How sunny is Porthmadog?
Porthmadog receives around 1,192 hours of sunshine per year. May is the sunniest month with 169 hours, while December is the cloudiest with just 26 hours.
Porthmadog 3-Day Forecast
Porthmadog on the map
Porthmadog is highlighted - select any city to see its climate.
Popular in October
Where to go in October - average daytime high across popular destinations.
London
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15°C (59°F) Edinburgh13°C (55°F) Glasgow14°C (57°F) Bucket list
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