Climate Insights for Mont-de-Marsan

The climate in Mont-de-Marsan is temperate. The average annual temperature is 15°C and approximately 935mm of precipitation falls per year. Mont-de-Marsan receives a notable amount of rainfall throughout the year, including during its driest month. Mont-de-Marsan is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to 4°C.

Temperatures in Mont-de-Marsan vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 23°C. January is the coolest month, with minimum temperatures around 4°C and an average of 7°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 5°C shift in average temperatures.

Mont-de-Marsan is a moderately rainy area, receiving approximately 935mm of precipitation annually, which averages out to around 78mm per month. The wettest month is May, averaging 103mm of rainfall. January and December also tend to see above-average precipitation. The driest month is July, with just 39mm. That's 64mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall.

Mont-de-Marsan is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is March, averaging 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Mont-de-Marsan, which began on June 21, 2026. Mont-de-Marsan 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 29°C, while the coldest stretch bottoms out in January near 4°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.

The best time to visit Mont-de-Marsan is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 21°C with modest rainfall averaging 56mm per month. By contrast, January can be quite cold with temperatures dropping to 4°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Mont-de-Marsan 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.