Swimming in Boulogne-sur-Mer in september 2025: Average sea temperature in september and tide times in september 2025
Average sea temperature in Boulogne-sur-Mer in september 2025.
In september, according to seasonal norms, the sea temperature in Boulogne-sur-Mer is:
Minimum: 63°F
Average: 64°F
Maximum: 67°F
Other useful seasonal weather averages in september:
- Outside temperature: 58°F to 64°F
- Most common weather: "Clear/Sunny"
- The wind blows at 8.7mph
- It rains a total of 2.6in, over 4 day(s).
Should we swim in Boulogne-sur-Mer in september?
Yes... and no. The water temperature in Boulogne-sur-Mer in september is cool
Swimming in september on the beaches of Boulogne-sur-Mer is possible but the sea water is cool. So even though the sea temperature sometimes climbs to 67°F, it can also be as low as 63°F! Note that the average is 64°F.
Note also that in september, the climate is good with an average outside temperature of 61°F, 2.6in of precipitation (over 4 days) and 83.99 % humidity.
Water and normal seasonal temperatures in Boulogne-sur-Mer in september
| September | |||
| Average sea temperature | 64°F | ||
| Minimum sea temperature | 63°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 65°F | ||
| Minimum outside temperature | 59°F | ||
| Wind speed | 14.9mph | ||
| Wind temperature | 58°F | ||
| Precipitation | 2.6in | ||
| Number of days of rain | 4 jour(s) (15%) | ||
| Humidity | 84% | ||
| Visibility in kilometers | 9.53km | ||
| Cloud cover | 38% | ||
| Our opinion | cool swimming |
Chart of the tides in september 2025
Tide times in september 2025 in Boulogne-sur-Mer
Swim elsewhere in the North of France in september
| City | Average T° | Min. T° | Max. T° | Our opinion | Calais in september | 65°F | 67°F | cool swimming | Dunkirk in september | 65°F | 68°F | cool swimming | Le Touquet in september | 64°F | 67°F | cool swimming | Bray-Dunes in september | 65°F | 68°F | cool swimming | Wissant in september | 65°F | 67°F | cool swimming | Audinghen in september | 64°F | 67°F | cool swimming | Escalles in september | 65°F | 67°F | cool swimming | Petit Fort Philippe in september | 64°F | 67°F | cool swimming |
Swim in the North of France in september: sea temperature by city