Grande-Synthe Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Grande-Synthe.
Climate overview of Grande-Synthe
Grande-Synthe, Nord-Pas-de-Calais, France, sees big temperature differences between seasons, with August peaking at 23°C (73°F) and January dropping to 8°C (46°F).
Grande-Synthe sees a moderate amount of rainfall, totalling around 762 mm (30 in) per year. It experiences warm summers and cold winters, creating some seasonal variation. The most sunshine falls in July, with an average of 7.7 hours of daily sunshine.
Grande-Synthe Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Grande-Synthe - and find the best time to visit.
Monthly Temperature in Grande-Synthe
Visitors to Grande-Synthe can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 23°C (73°F) in August, 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 15°C (59°F) in August to around 3°C (37°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Grande-Synthe
Generally, Grande-Synthe experiences moderate precipitation patterns, averaging 762 mm (30 in) yearly. Year-round, Grande-Synthe has a balanced climate with minimal variation in precipitation. The difference between the wettest month, December, with 75 mm (3 in), and the driest month, April, with 52 mm (2 in), is minimal. For more details, please visit our Grande-Synthe 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 Grande-Synthe
Seasonal changes in sunshine hours are quite dramatic in Grande-Synthe. While July receives considerable daily sunshine with up to 7.7 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.6 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Grande-Synthe by Month
The city experiences its highest humidity in December, reaching 93%. In May, the humidity drops to its lowest level at 84%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Grande-Synthe
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July and August
- Most sunshine: July
- Seasonal pattern: Warm summers and cold winters
Frequently asked questions about the climate in Grande-Synthe
What is the best time to visit Grande-Synthe?
June, July, August and September typically offer the most optimal weather in Grande-Synthe. In contrast, January, February and December tend to have less optimal conditions. Grande-Synthe has warm summers and cold winters.
What temperatures can I expect in Grande-Synthe?
Daytime highs range from 8°C (46°F) in January to 23°C (73°F) in August. Nighttime lows range from 3°C (37°F) to 15°C (59°F). Temperatures vary considerably through the year.
How much rain does Grande-Synthe get?
Annual rainfall is around 762 mm (30 in). December is the wettest month with 75 mm (3 in), while April is the driest with 52 mm (2 in).
How sunny is Grande-Synthe?
Grande-Synthe receives around 1,743 hours of sunshine per year. July is the sunniest month with 232 hours, while December is the cloudiest with just 48 hours.
Grande-Synthe 3-Day Forecast
Grande-Synthe 3-Day Forecast
Grande-Synthe on the map
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