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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.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 8°C | 3°C | -6°C / 15°C | 94 mm | 87% | 14 km/h |
| February | 8°C | 4°C | -8°C / 17°C | 138 mm | 85% | 16 km/h |
| March | 10°C | 5°C | -4°C / 21°C | 75 mm | 82% | 14 km/h |
| April | 13°C | 6°C | -3°C / 23°C | 58 mm | 78% | 12 km/h |
| May | 17°C | 9°C | -1°C / 28°C | 57 mm | 79% | 12 km/h |
| June | 20°C | 12°C | 6°C / 36°C | 50 mm | 79% | 12 km/h |
| July | 22°C | 14°C | 7°C / 37°C | 41 mm | 78% | 12 km/h |
| August | 22°C | 14°C | 4°C / 35°C | 55 mm | 79% | 12 km/h |
| September | 19°C | 12°C | 2°C / 30°C | 55 mm | 82% | 12 km/h |
| October | 15°C | 10°C | 0°C / 22°C | 89 mm | 85% | 14 km/h |
| November | 11°C | 7°C | -6°C / 16°C | 91 mm | 87% | 16 km/h |
| December | 9°C | 5°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 884 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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