Swimming in Picardy in september 2025 Sea temperature by city in september
Do you want to go to the beach in Picardy in september 2025? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in Picardy by city and our opinion on the chances of enjoying pleasant sea conditions.
Sea temperature in Picardy in september 2025
Here, find the average sea temperature in Picardy in september in several coastal cities.
65°F
min: 63°F / max: 67°F
65°F
min: 63°F / max: 67°F
65°F
min: 63°F / max: 67°F
65°F
min: 63°F / max: 67°F
Ault
64°F
min: 62°F / max: 67°F
Cayeux-sur-Mer
65°F
min: 62°F / max: 66°F
Le Crotoy
65°F
min: 63°F / max: 67°F
Mers-les-Bains
64°F
min: 62°F / max: 66°F
Where should you go swimming in Picardy in the month of september?
Swimming in Picardy in september is cool
In september in Picardy swimming conditions are generally the same everywhere.
Swimming in september in Somme Bay, Fort-Mahon-Plage, Quend Plage, Saint-Valery-sur-Somme, Ault, Cayeux-sur-Mer, Le Crotoy and Mers-les-Bains is possible but the sea is generally cool. So though the sea temperature may sometimes reach 67°F, it can also go as low as 63°F. Note that the average is 65°F.
Where to go swimming in Picardy in september: the map of sea temperatures
ideal swimming 
pleasant swimming 
cool swimming 
cold swimming 
freezing swimmingWater temperature and seasonal norms in september
Somme Bay
| September | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 63°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 68°F | ||
| Minimum outside temperature | 56°F | ||
| Precipitation | 2.7in | ||
| Number of days of precipitation | 5 jour(s) (15%) | ||
| Cloud cover | 40% | ||
| Our opinion | cool swimming |
More information on swimming in the Somme Bay in september
Fort-Mahon-Plage
| September | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 63°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 63°F | ||
| Maximum outside temperature | 67°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 3.5in | ||
| Number of days of precipitation | 6 jour(s) (19%) | ||
| Cloud cover | 41% | ||
| Our opinion | cool swimming |
More information on swimming in Fort-Mahon-Plage in september
Quend Plage
| September | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 63°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 63°F | ||
| Maximum outside temperature | 67°F | ||
| Minimum outside temperature | 58°F | ||
| Precipitation | 3.5in | ||
| Number of days of precipitation | 6 jour(s) (19%) | ||
| Cloud cover | 41% | ||
| Our opinion | cool swimming |
More information on swimming in Quend Plage in september
Saint-Valery-sur-Somme
| September | |||
| Average sea temperature | 65°F | ||
| Minimum sea temperature | 63°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 68°F | ||
| Minimum outside temperature | 56°F | ||
| Precipitation | 2.7in | ||
| Number of days of precipitation | 5 jour(s) (15%) | ||
| Cloud cover | 40% | ||
| Our opinion | cool swimming |
More information on swimming in Saint-Valery-sur-Somme in september
Ault
| September | |||
| Average sea temperature | 64°F | ||
| Minimum sea temperature | 62°F | ||
| Maximum sea temperature | 67°F | ||
| Average outside temperature | 61°F | ||
| Maximum outside temperature | 68°F | ||
| Minimum outside temperature | 56°F | ||
| Precipitation | 2.7in | ||
| Number of days of precipitation | 5 jour(s) (15%) | ||
| Cloud cover | 40% | ||
| Our opinion | cool swimming |
List of coastal cities in Picardy
| Somme Bay in september | cool swimming |
| Fort-Mahon-Plage in september | cool swimming |
| Quend Plage in september | cool swimming |
| Saint-Valery-sur-Somme in september | cool swimming |
| Ault in september | cool swimming |
| Cayeux-sur-Mer in september | cool swimming |
| Le Crotoy in september | cool swimming |
| Mers-les-Bains in september | cool swimming |