Sea temperature and swimming season in France

When the sea is warm enough to swim in 26 coastal cities in France.

City	Warmest	Coldest	Swimming season
Marseille	23.1°C Aug	13.5°C Feb	Jun – Oct (5 months)
Nice	26.3°C Aug	14.1°C Feb	Jun – Oct (5 months)
Le Havre	20.0°C Aug	8.4°C Feb	Jul – Aug (2 months)
Toulon	24.8°C Aug	14.0°C Feb	Jun – Oct (5 months)
Dunkirk	19.2°C Aug	8.1°C Feb	Aug – Aug (1 months)
La Rochelle	20.4°C Aug	9.6°C Jan	Jul – Sep (3 months)
Cannes	26.4°C Aug	14.1°C Feb	Jun – Oct (5 months)
Calais	18.6°C Aug	8.6°C Feb	never comfortable
Saint-Nazaire	19.1°C Aug	8.7°C Jan	Aug – Aug (1 months)
Quimper	17.6°C Aug	10.3°C Feb	never comfortable
Lorient	18.2°C Aug	10.1°C Jan	never comfortable
Ajaccio	26.1°C Aug	14.2°C Feb	Jun – Nov (6 months)
Saint-Brieuc	18.8°C Aug	9.5°C Feb	never comfortable
Saint-Malo	19.0°C Aug	9.4°C Feb	Aug – Aug (1 months)
Hyères	25.1°C Aug	14.1°C Feb	Jun – Oct (5 months)
Boulogne-sur-Mer	18.9°C Aug	8.4°C Feb	never comfortable
Aubagne	23.3°C Aug	13.5°C Feb	Jun – Oct (5 months)
Bastia	26.9°C Aug	14.6°C Mar	Jun – Nov (6 months)
Sète	22.9°C Aug	12.3°C Feb	Jun – Sep (4 months)
Dieppe	19.2°C Aug	8.6°C Feb	Aug – Aug (1 months)
Biarritz	22.9°C Aug	12.4°C Jan	Jun – Oct (5 months)
Cherbourg	17.9°C Sep	9.8°C Feb	never comfortable
Hérouville-Saint-Clair	19.4°C Aug	8.8°C Feb	Aug – Aug (1 months)
Agde	22.9°C Aug	12.3°C Feb	Jun – Sep (4 months)
Royan	21.2°C Aug	10.4°C Jan	Jun – Sep (4 months)
Bayeux	19.1°C Aug	8.9°C Feb	Aug – Aug (1 months)