Boulogne-sur-Mer Weather & Climate: Best Time to Visit

Visitors to Boulogne-sur-Mer can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a pleasant 22°C (72°F) in August, the warmest time of the year, to a chilly 9°C (48°F) during cooler months like February.

At night, you can expect temperatures ranging from 15°C (59°F) in August to around 4°C (39°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

Generally, Boulogne-sur-Mer experiences moderate precipitation patterns, averaging 922 mm (36 in) yearly. While rainfall varies throughout the year, each season offers its own charm. December brings wetter days averaging 105 mm (4.1 in) of precipitation, spread over 17 rainy days.

In contrast, the driest month April experiences a drier climate, with about 56 mm (2.2 in) of rainfall spread across 15 rainy days. For more details, please visit our Boulogne-sur-Mer Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Boulogne-sur-Mer. While July receives considerable daily sunshine with up to 7.3 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.8 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The city experiences its highest humidity in November, reaching 89%. In April, the humidity drops to its lowest level at 82%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year