Climate Overview
The climate in Olonne-sur-Mer is temperate. The average annual temperature is 14°C and approximately 840mm of precipitation falls per year. November is the wettest month, receiving around 115mm of rainfall. Olonne-sur-Mer is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, February, December, when temperatures can drop to 6°C.
Temperature
Olonne-sur-Mer sees moderate temperature variation throughout the year, ranging from 6°C to 22°C. August is the warmest month, though highs remain moderate at 22°C with a mean of 20°C. January is the coolest month, with minimum temperatures around 6°C and an average of 8°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between October and November, with a 4°C shift in average temperatures.
Precipitation
Olonne-sur-Mer is a moderately rainy area, receiving approximately 840mm of precipitation annually, which averages out to around 70mm per month. The wettest month is November, averaging 115mm of rainfall. December and January also tend to see above-average precipitation. The driest month is July, with just 27mm. That's 88mm less than November, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
Olonne-sur-Mer is mildly breezy, with an average annual wind speed of 19km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in August, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 21km/h in winter, 19km/h in spring, 16km/h in summer, 19km/h in autumn.
Seasons
3 days until Autumn
It is currently summer in Olonne-sur-Mer, which began on June 21, 2026. Olonne-sur-Mer is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 22°C, while the coldest stretch bottoms out in January near 6°C. Autumn is next, beginning on September 23, 2026 (3 days from now).
Spring
Temperatures range from 8 to 17°C. Precipitation is moderate at around 173mm for the season, averaging 58mm per month. Winds are moderate at around 19km/h. Light layers work well as temperatures warm through the season. It is a great time to be outdoors.
Summer
Temperatures range from 16 to 22°C. Rainfall is relatively light, with around 111mm over the season and a monthly average of 37mm. Winds are moderate at around 16km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 10 to 20°C. Precipitation is moderate at around 269mm for the season, averaging 90mm per month. Winds are moderate at around 19km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 6 to 11°C. Precipitation is moderate at around 288mm for the season, averaging 96mm per month. Winds are moderate at around 21km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Best Time to Visit
The best time to visit Olonne-sur-Mer is during May, June, July, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 53mm per month. By contrast, January can be quite cold with temperatures dropping to 6°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.
Monthly Climate Data
The table below shows monthly climate averages for Olonne-sur-Mer based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
