Mont-de-Marsan in Summer
In summer (June, July and August), Mont-de-Marsan sees average daytime highs around 28°C and overnight lows near 16°C, with 155 mm of rain over about 25 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 25°C in early June to 28°C by late August. The sky is clear or mostly clear about 34% of the time across summer, and the air most often feels comfortable.
Summer is Mont-de-Marsan's best season of the year to visit on our travel score. For the whole year in context, see Mont-de-Marsan's year-round climate.
- Avg daytime high
- 28°C
- warmest season of the year
- Avg overnight low
- 16°C
- Rainfall
- 155 mm
- 25 wet days
- Avg wind
- 8 km/h
- Travel score
- 6.3
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Mont-de-Marsan in Summer
Over the season highs climb from about 25°C in early June to 28°C by late August.
A typical summer day in Mont-de-Marsan reaches about 28°C and drops to 16°C overnight. The warmest of the three months is August, the coolest June.
Mont-de-Marsan weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 11° / 4° | 66 | 11 | 9.1 | 2.6 |
| Feb | 13° / 4° | 52 | 9.5 | 10.2 | 3.4 |
| Mar | 16° / 6° | 56 | 10.7 | 11.6 | 5.1 |
| Apr | 19° / 8° | 74 | 12.2 | 13.2 | 5.7 |
| May | 22° / 12° | 72 | 11.9 | 14.5 | 6.3 |
| Jun | 26° / 15° | 59 | 9.2 | 15.2 | 6.7 |
| Jul | 29° / 16° | 45 | 7.8 | 14.9 | 6.2 |
| Aug | 29° / 16° | 51 | 7.7 | 13.8 | 6.1 |
| Sep | 25° / 14° | 50 | 8.3 | 12.3 | 7.0 |
| Oct | 21° / 11° | 62 | 10.2 | 10.8 | 6.3 |
| Nov | 15° / 7° | 74 | 11.5 | 9.5 | 4.2 |
| Dec | 12° / 4° | 68 | 11 | 8.8 | 2.8 |
Cloud cover in Summer
The sky is clear or mostly clear about 34% of the time across summer.
Chance of precipitation in Summer
Mont-de-Marsan gets around 155 mm of rain over 25 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 8 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 hours in early June to 13 h 06 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.8 kWh/m².
Is summer a good time to visit Mont-de-Marsan?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Mont-de-Marsan for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Mont-de-Marsan in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Mont-de-Marsan sees daytime highs around 28°C and nights near 16°C. Pack light clothes and sun protection. Worth having: rain gear. About 25 days see rain.
Sea temperature near Mont-de-Marsan in Summer
The nearest coast averages about 21°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 70 km away) is warmest in August at about 22°C and coldest in February near 12°C.
It's comfortable for a long swim from Jul 3 to Sep 23 — about 2.7 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 13 | 12 | 12 | 14 | 16 | 19 | 21 | 22 | 21 | 18 | 16 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 13 | Bracing |
| Feb | 12 | Bracing |
| Mar | 12 | Bracing |
| Apr | 14 | Bracing |
| May | 16 | Cool |
| Jun | 19 | Cool |
| Jul | 21 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 18 | Cool |
| Nov | 16 | Cool |
| Dec | 14 | Bracing |
UV index in Mont-de-Marsan in Summer
Clear-sky midday UV across summer averages around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Mont-de-Marsan peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 4 | 6 | 6 | 7 | 8 | 8 | 5 | 3 | 2 | 1 |
| Level | Low | Low | Moderate | High | High | Very high | Very high | Very high | Moderate | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Low |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 6 | High |
| Jun | 7 | Very high |
| Jul | 8 | Very high |
| Aug | 8 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Mont-de-Marsan?
Mont-de-Marsan sits at 43.9°N, 0.5°W, 51 m above sea level, in France. The nearest listed city is Dax, 49 km away.
Topography around Mont-de-Marsan
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Mont-de-Marsan.
Within 3 km, the terrain around Mont-de-Marsan has only modest variations in elevation — a maximum elevation change of 73 m around an average of 61 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 128 m; within 80 km, large variations in elevation — a maximum elevation change of 637 m.
The land around Mont-de-Marsan is covered by trees (42%) and artificial surfaces (41%) within 3 km, trees (58%) and cropland (20%) within 16 km, and trees (49%), cropland (25%) and grassland (21%) within 80 km.
France travel facts
- Travel advisory
- Level 2
- Exercise Increased Caution
- Power plugs
- Type C / E
- 230 V · 50 Hz
- Prices
- ≈ 77% of US
- price level, 2025
- GDP per capita
- $48,986
- 2025
- Happiness
- 6.6 / 10
- World Happiness, 2025
- Safe drinking water
- 100%
- of population, 2024
- Homicide rate
- 1.3
- per 100k, 2023
- Road deaths
- 5.1
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 539
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Mont-de-Marsan (43.8902°, -0.4971°, elevation 51 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.