La Seyne-sur-Mer Temperature by Month

La Seyne-sur-Mer in Provence-Alpes-Côte d'Azur, France sees significant seasonal temperature differences, with daytime highs between 13°C (55°F) in January and 27°C (81°F) in August, averaging 19°C (66°F) annually. Explore the full monthly breakdown below.

The weather in La Seyne-sur-Mer experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 21°C (70°F) in August to 7°C (45°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in La Seyne-sur-Mer by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 335 hours of sunshine.

The chart below shows the average temperature throughout the year:

La Seyne-sur-Mer's average annual maximum temperature is 19°C (66°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In La Seyne-sur-Mer, January is the coolest month, with average highs of 13°C (55°F) and humidity around 58%, considered moderate. In August, the warmest month, temperatures average 27°C (81°F) with 50% humidity, conditions that feel moderate. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in La Seyne-sur-Mer this rarely lasts long on the ground.

For more on La Seyne-sur-Mer's weather, including monthly rainfall, sunshine hours, and humidity, visit our La Seyne-sur-Mer climate page.