Mont-de-Marsan, France Climate
The warmest month is August, with an average high of 29°C; the coldest is February, with an average low of 1°C. A normal year brings 874 mm of precipitation.
Temperature through the year
The normal daily high and low and the record for every date at Mont-de-marsan, since 1973. The line marks today.
- Normal low
- Normal high
- Record high
- Record low
Normals for Sep 30
- Normal high
- 23°C
- Normal low
- 10°C
- Record high
- 33°Cin 1985
- Record low
- 4°Cin 2008
- Chance of a wet day
- 40%
- Daylight
- 11 h 47 min
Month by month
Averages for 1991-2020. Wet days have at least 1 mm of precipitation in the reanalysis. Each month links to its own page.
| Month | Avg high | Avg low | Record high | Record low | Precipitation | Wet days |
|---|---|---|---|---|---|---|
| January | 11°C | 23°C (2022) | -18°C (1985) | 81 mm | 12.7 | |
| February | 13°C | 1°C | 27°C (2019) | -11°C (2012) | 62 mm | 10.7 |
| March | 17°C | 30°C (2023) | -11°C (2005) | 63 mm | 11.2 | |
| April | 19°C | 32°C (2005) | -5°C (1996) | 82 mm | 13.2 | |
| May | 23°C | 35°C (2001) | -1°C (1976) | 78 mm | 13.2 | |
| June | 26°C | 41°C (2022) | 2°C (1975) | 73 mm | 10.3 | |
| July | 28°C | 15°C | 41°C (2022) | 5°C (1978) | 53 mm | 8.8 |
| August | 29°C | 41°C (2003) | 4°C (1986) | 51 mm | 9.3 | |
| September | 25°C | 11°C | 39°C (2022) | 1°C (1977) | 73 mm | 10.2 |
| October | 21°C | 34°C (2004) | -5°C (2003) | 81 mm | 11.9 | |
| November | 14°C | 26°C (1985) | -10°C (1988) | 98 mm | 13.7 | |
| December | 12°C | 23°C (1989) | -14°C (2001) | 80 mm | 12.6 | |
| Year | 20°C | 874 mm | 138 |
Precipitation
Rain and melted snow together. The chance of a wet day is the share of days with at least 1 mm of precipitation in the reanalysis.
874 mm in a normal year, most in November.
Chance of a wet day
- Chance of a wet day
Humidity and comfort
NASA POWER reanalysis, 1991-2020, for the grid cell around Mont-de-Marsan.
The muggiest month is July, when 6 percent of days are muggy or worse, with a mean dew point of 18°C or more.
| Month | Dew point | Humidity | Dry | Comfortable | Humid | Muggy | Oppressive | Miserable |
|---|---|---|---|---|---|---|---|---|
| January | 4°C | 89% | 100% | 0% | 0% | 0% | 0% | 0% |
| February | 4°C | 85% | 100% | 0% | 0% | 0% | 0% | 0% |
| March | 6°C | 80% | 100% | 0% | 0% | 0% | 0% | 0% |
| April | 8°C | 77% | 98% | 2% | 0% | 0% | 0% | 0% |
| May | 11°C | 74% | 75% | 21% | 4% | 0% | 0% | 0% |
| June | 13°C | 72% | 39% | 40% | 20% | 1% | 0% | 0% |
| July | 15°C | 69% | 23% | 40% | 31% | 6% | 0% | 0% |
| August | 15°C | 68% | 23% | 41% | 32% | 4% | 0% | 0% |
| September | 12°C | 71% | 54% | 34% | 12% | 0% | 0% | 0% |
| October | 10°C | 79% | 77% | 20% | 3% | 0% | 0% | 0% |
| November | 7°C | 87% | 97% | 3% | 0% | 0% | 0% | 0% |
| December | 5°C | 90% | 100% | 0% | 0% | 0% | 0% | 0% |
Comfort is judged by the day's mean dew point: dry below 13°C, comfortable to 16°C, humid to 18°C, muggy to 21°C, oppressive to 24°C, miserable above.
Clouds
Average share of the sky covered, from satellite (CERES and GEWEX SRB) by way of NASA POWER, 1991-2020.
The clearest month is August, with the sky 54 percent covered on average; the cloudiest is January, at 71 percent.
Wind
The mean wind speed over the whole day, from the MERRA-2 reanalysis by way of NASA POWER. Gusts run well above it.
The windiest month is January, averaging 7.2 km/h at 10 meters (33 feet) above the ground.
Daylight and sunshine
The longest day is Jun 19, with 15 h 29 min of daylight; the shortest is Dec 18, with 8 h 54 min.
- Day length
Solar energy
Average daily sunshine reaching the ground on a flat surface, in kilowatt-hours per square meter, clouds included.
Month pages
The weather in Mont-de-Marsan in each month, day by day.
What this means
A normal is the average of the thirty years 1991 to 2020, the period the World Meteorological Organization and NOAA use for comparison. It is an average, not a forecast: most days depart from it, and some by a long way.
A record is the highest or lowest value on the date in every year the station has reported, back to 1973. It rests on one station, so a neighbor a few miles away can hold different ones.
Cloud, humidity, wind and sunshine come from a reanalysis: a weather model run over the past with every observation fed in, averaged over a grid cell about 50 km across. It is consistent everywhere on Earth; it smooths local detail such as a lake shore or a valley.
More for this place
Nearby
Sources
Records: NOAA GHCN-Daily, station FRM00007607, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-30. Sun and moon: computed with the NOAA solar equations and Meeus.