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Sizun Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Sizun.
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Climate overview of Sizun
The climate in Sizun, Brittany, France, is marked by large temperature swings across the seasons, ranging from 22°C (72°F) in August to 11°C (52°F) in January.
Rainfall is high, totalling around 1020 mm (40 in) per year. December is the wettest month and July the driest. The city also experiences pleasant summers and cold winters. July is the sunniest month, averaging 7.6 hours of sunshine per day.
Sizun Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sizun - and find the best time to visit.
Monthly Temperature in Sizun
In Sizun, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a pleasant 22°C (72°F) in August, the warmest time of the year, to a chilly 11°C (52°F) during cooler months like January.
At night, you can expect temperatures ranging from 13°C (55°F) in August to around 4°C (39°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Sizun
Sizun experiences significant rainfall throughout the year, averaging 1020 mm (40 in) of precipitation annually. While rainfall varies throughout the year, each season offers its own charm. December brings wetter days averaging 113 mm (4.4 in) of precipitation, spread over 21 rainy days.
In contrast, the driest month July experiences a drier climate, with about 60 mm (2.4 in) of rainfall spread across 13 rainy days. For more details, please visit our Sizun 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 Sizun
Seasonal changes in sunshine hours are quite dramatic in Sizun. While July receives considerable daily sunshine with up to 7.6 hours, December marks the darkest time of the year, where sunshine is scarce with only 2.1 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Brest, France (25 KM, 15 Miles).
Daily hours of sunshine
Data from: Brest, France (25 KM, 15 Miles).
Daily percentage of sunshine
Data from: Brest, France (25 KM, 15 Miles).
Humidity in Sizun by Month
The city experiences its highest humidity in January, reaching 86%. In April, the humidity drops to its lowest level at 81%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Brest, France (25 KM, 15 Miles).
Best Time to Visit Sizun
Conditions in Sizun are generally most comfortable in June, July, August and September. They are typically least comfortable in January, 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
mixed
Mar
mixed
Apr
good
May
good
Jun
excellent
Jul
excellent
Aug
excellent
Sep
excellent
Oct
good
Nov
wet
Dec
wet
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Fewest rainy days: June, July, August and September
- Seasonal pattern: Pleasant summers and cold winters
Frequently asked questions about the climate in Sizun
What is the best time to visit Sizun?
June, July, August and September typically offer the most optimal weather in Sizun. In contrast, January, November and December tend to have less optimal conditions. Sizun has pleasant summers and cold winters.
What temperatures can I expect in Sizun?
Daytime highs range from 11°C (52°F) in January to 22°C (72°F) in August. Nighttime lows range from 4°C (39°F) to 13°C (55°F). Temperatures vary considerably through the year.
How much rain does Sizun get?
Annual rainfall is around 1020 mm (40 in). December is the wettest month with 113 mm (4.4 in), while July is the driest with 60 mm (2.4 in).
How sunny is Sizun?
Sizun receives around 1,752 hours of sunshine per year. July is the sunniest month with 229 hours, while December is the cloudiest with just 63 hours.
Sizun 3-Day Forecast
Sizun on the map
Sizun is highlighted - select any city to see its climate.
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