July is the hottest month in Boulogne with an average temperature of 17°C (63°F) and the coldest is February at 4°C (39°F) with the most daily sunshine hours at 8 in July. The wettest month is October with an average of 90mm of rain. The best month to swim in the sea is in August when the average sea temperature is 17°C (63°F).
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Sunrise 08:08
Sunset 17:08
Sunrise 08:08
Sunset 17:08