Trefriw Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Trefriw.
Climate overview of Trefriw
The climate in Trefriw, Gwynedd, United Kingdom, is marked by large temperature swings across the seasons, ranging from 20°C (68°F) in July to 8°C (46°F) in January.
The city has a wet climate, receiving around 1179 mm (46 in) of rain/snowfall per year. Despite the high annual total, it has pleasant summers and cold winters. December is the wettest month. Sunshine peaks in May, when the city sees around 5.6 hours of sunshine per day.
Trefriw Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Trefriw - and find the best time to visit.
Monthly Temperature in Trefriw
In Trefriw, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a pleasant 20°C (68°F) in July to a chilly 8°C (46°F) in January.
Nighttime temperatures range from 12°C (54°F) in July to 2°C (36°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Trefriw
Trefriw experiences significant rain/snowfall throughout the year, averaging 1179 mm (46 in) of precipitation annually. The wettest period in Trefriw occurs in December, which receives around 118 mm (4.6 in) of precipitation. During the driest month, May, Trefriw experiences moderate rainfall, totaling 85 mm (3.3 in). The consistent precipitation levels throughout the year contribute to a relatively stable climate. For more details, please visit our Trefriw 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 Trefriw
In Trefriw, summer days are longer and more sunny, with daily sunshine hours peaking at 5.6 hours in May. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 0.9 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Trefriw
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: July
- Warmest weather: July and August
- Most sunshine: May
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Trefriw
What is the best time to visit Trefriw?
July typically offers the most optimal weather in Trefriw. In contrast, January, February, March, November and December tend to have less optimal conditions. Trefriw has pleasant summers and cold winters.
What temperatures can I expect in Trefriw?
Daytime highs range from 8°C (46°F) in January to 20°C (68°F) in July. Nighttime lows range from 2°C (36°F) to 12°C (54°F). Temperatures vary considerably through the year.
How much rain does Trefriw get?
Annual rainfall is around 1179 mm (46 in). December is the wettest month with 118 mm (4.6 in), while May is the driest with 85 mm (3.3 in).
How sunny is Trefriw?
Trefriw 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.
Trefriw 3-Day Forecast
Trefriw on the map
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Popular this month
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London
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