Weatheo

Boulogne-sur-Mer Weather by Month

Average temperatures, rainfall and humidity for Boulogne-sur-Mer, France, month by month, built from OpenWeather’s historical records. Use it to see what a typical Boulogne-sur-Mer month looks like before you travel — then check the live Boulogne-sur-Mer forecast for the days ahead.

Warmest month

July

22°C average high

Coolest month

January

3°C average low

Wettest month

February

138 mm of rain

Driest month

July

41 mm of rain

Average temperature and rainfall in Boulogne-sur-Mer by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January8°C3°C-6°C / 15°C
94 mm
87%14 km/h
February8°C4°C-8°C / 17°C
138 mm
85%16 km/h
March10°C5°C-4°C / 21°C
75 mm
82%14 km/h
April13°C6°C-3°C / 23°C
58 mm
78%12 km/h
May17°C9°C-1°C / 28°C
57 mm
79%12 km/h
June20°C12°C6°C / 36°C
50 mm
79%12 km/h
July22°C14°C7°C / 37°C
41 mm
78%12 km/h
August22°C14°C4°C / 35°C
55 mm
79%12 km/h
September19°C12°C2°C / 30°C
53 mm
82%12 km/h
October15°C10°C0°C / 22°C
87 mm
85%13 km/h
November11°C7°C-6°C / 16°C
91 mm
87%16 km/h
December9°C5°C-5°C / 17°C
82 mm
88%16 km/h

Best time to visit Boulogne-sur-Mer

The most comfortable time to visit Boulogne-sur-Mer is generally June to August, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around February, totalling about 881 mm a year.

Travellers who prefer heat should aim for July, when highs average 22°C. February is the month to avoid if rain would spoil your plans — it averages 138 mm, roughly 3× the rainfall of the driest month (July).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Boulogne-sur-Mer forecast for what is happening now.

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