Sea temperature in France
Live water temperatures and swimming conditions across 362 beaches on the France coast.
Best time to swim in France
The sea in France peaks in August, when the water averages around 24°C.
The main swimming season runs from June – September, when surface temperatures stay comfortable for extended sessions.
On average, 4 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like May and October are noticeably cooler but often quieter, with fewer crowds and steadier weather.
Outside peak season the water drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable.
The coldest month is typically January at around 13°C, when cold-water swimmers dominate the coast.
France sea temperature history
Long-term climatology for France shows an annual mean sea temperature of 17°C, ranging from 13°C in winter to 24°C at the summer peak.
The seasonal swing is roughly 11°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at France, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Values are area averages; individual beaches vary by exposure and depth.
France sea temperature: frequently asked questions
What is the warmest month to swim in France?
August is the warmest month in France, when the sea averages about 24°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in France?
The coldest month in France is typically January, when the water averages around 13°C. Cold-water swimmers and surfers dominate this period.
When can you swim in France without a wetsuit?
The main swimming season in France runs from June – September — about 4 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in France?
Outside peak summer the water in France drops toward 15°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in France?
The long-term annual mean sea temperature in France is about 17°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in France?
The live reading at the top of this page shows the current sea temperature in France, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Coastal regions of France
Region hubs with live sea temperatures, swim conditions and a beach directory.