Weather in January
In La Seyne-sur-Mer, France, in January, the average water temperature is 13.4°C (56.1°F). Note: Taking a dip in 13.4°C (56.1°F) can be perilous. Submersion in temperatures under 10°C (50°F) triggers severe cold shock accompanied by hyperventilation. Weather in January »
Weather in February
The month with the coldest seawater in La Seyne-sur-Mer, France, is February, with an average sea temperature of 13°C (55.4°F). Note: Staying in 13°C (55.4°F) waters for just a few moments at 13°C (55.4°F) can be harrowing, and below 10°C (50°F) poses breathing and cold shock risks, depending on individual tolerance. Weather in February »
Weather in March
In March, the average sea temperature in La Seyne-sur-Mer, France, is 13.3°C (55.9°F). Note: Swimming in 13.3°C (55.9°F) is considered life-threatening. Weather in March »
Weather in April
In La Seyne-sur-Mer, France, the average seawater temperature in April is 14.4°C (57.9°F). Note: If planning to swim in 14.4°C (57.9°F) under 10°C (50°F), wear a protective suit. Weather in April »
Weather in May
In May, the average sea temperature in La Seyne-sur-Mer, France, is 17.1°C (62.8°F). Note: Swimming in 17.1°C (62.8°F) is not enjoyable for the majority. Weather in May »
Weather in June
In La Seyne-sur-Mer, France, in June, the average water temperature is 20.8°C (69.4°F). Note: A majority do not enjoy swimming in water at 20.8°C (69.4°F). Weather in June »
Weather in July
In La Seyne-sur-Mer, France, the average seawater temperature in July is 21.6°C (70.9°F). Note: Most people do not enjoy swimming in water that is 21.6°C (70.9°F). Weather in July »
Weather in August
The month with the warmest seawater in La Seyne-sur-Mer, France, is August, with an average sea temperature of 22.3°C (72.1°F). Note: For individuals prone to feeling cold, swimming in 23°C (73.4°F) is still regarded as intolerable. Weather in August »
Weather in September
In September, the average sea temperature in La Seyne-sur-Mer, France, is 21.8°C (71.2°F). Note: Swimming in water at 21.8°C (71.2°F) is not a pleasurable experience for most. Weather in September »
Weather in October
In La Seyne-sur-Mer, France, the average seawater temperature in October is 19.2°C (66.6°F). Note: Most people find it challenging to enjoy swimming in water that is 19.2°C (66.6°F). Weather in October »
Weather in November
In La Seyne-sur-Mer, France, in November, the average water temperature is 17.3°C (63.1°F). Note: Swimming is not a pleasant activity for most individuals in 17.3°C (63.1°F). Weather in November »
Weather in December
In La Seyne-sur-Mer, France, in December, the average water temperature is 15°C (59°F). Note: For most, swimming in 15°C (59°F) is not a pleasant activity. Weather in December »
[Resources]Frequently asked questions
What is the month with the coldest sea water in La Seyne-sur-Mer?
The month with the coldest seawater in La Seyne-sur-Mer is February, with an average sea temperature of 13°C (55.4°F).
When are the longest days in La Seyne-sur-Mer?
With an average of 15h and 18min of daylight, June has the longest days of the year.
What month is the sea warmest in La Seyne-sur-Mer?
With an average sea temperature of 22.3°C (72.1°F), August is the month with the warmest seawater in La Seyne-sur-Mer.
When is Daylight Saving Time (DST) in La Seyne-sur-Mer?
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
What is the month with the shortest days in La Seyne-sur-Mer?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average sea temperature
La Seyne-sur-Mer, France
The best month for swimming (with the highest average sea temperature) is August (22.3°C).
The coldest month (with the lowest average sea temperature) is February (13°C).
Average daylight
La Seyne-sur-Mer, France
- Average daylight in January:
9h and 2min - Average daylight in February:
10h and 3min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 2min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 4min - Average daylight in December:
9h and 1min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
La Seyne-sur-Mer, France
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