Gujan-Mestras in Summer
In summer (June, July and August), Gujan-Mestras sees average daytime highs around 25°C and overnight lows near 17°C, with 163 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 22°C in early June to 25°C by late August. The sky is clear or mostly clear about 38% of the time across summer, and the air most often feels comfortable.
Summer is Gujan-Mestras's best season of the year to visit on our travel score. For the whole year in context, see Gujan-Mestras's year-round climate.
- Avg daytime high
- 25°C
- warmest season of the year
- Avg overnight low
- 17°C
- Rainfall
- 163 mm
- 25 wet days
- Avg wind
- 10 km/h
- Travel score
- 7.2
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Gujan-Mestras in Summer
Over the season highs climb from about 22°C in early June to 25°C by late August.
A typical summer day in Gujan-Mestras reaches about 25°C and drops to 17°C overnight. The warmest of the three months is August, the coolest June.
Gujan-Mestras 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 | 10° / 5° | 72 | 11.5 | 9 | 2.3 |
| Feb | 11° / 5° | 52 | 9.4 | 10.1 | 2.8 |
| Mar | 14° / 7° | 54 | 10.7 | 11.6 | 4.2 |
| Apr | 17° / 9° | 66 | 12 | 13.2 | 5.0 |
| May | 20° / 13° | 70 | 11.6 | 14.6 | 6.0 |
| Jun | 23° / 16° | 63 | 9.3 | 15.3 | 7.0 |
| Jul | 25° / 18° | 46 | 7.8 | 15 | 7.3 |
| Aug | 26° / 18° | 53 | 8 | 13.9 | 7.3 |
| Sep | 23° / 15° | 63 | 9 | 12.3 | 7.0 |
| Oct | 19° / 12° | 73 | 10.6 | 10.7 | 5.9 |
| Nov | 14° / 8° | 88 | 12.5 | 9.4 | 3.7 |
| Dec | 11° / 6° | 77 | 11.8 | 8.7 | 2.6 |
Cloud cover in Summer
The sky is clear or mostly clear about 38% of the time across summer.
Chance of precipitation in Summer
Gujan-Mestras gets around 163 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 10 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 15 h 06 min 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 6.0 kWh/m².
Is summer a good time to visit Gujan-Mestras?
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 one of the better times to visit Gujan-Mestras for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Gujan-Mestras in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Gujan-Mestras sees daytime highs around 25°C and nights near 17°C. Pack sun protection. Worth having: light clothes and rain gear. About 25 days see rain.
Sea temperature near Gujan-Mestras in Summer
The nearest coast averages about 20°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 24 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 7 to Sep 18 — about 2.4 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 12 | 12 | 12 | 13 | 16 | 18 | 21 | 22 | 20 | 18 | 16 | 14 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 12 | Bracing |
| Feb | 12 | Bracing |
| Mar | 12 | Bracing |
| Apr | 13 | Bracing |
| May | 16 | Cool |
| Jun | 18 | Cool |
| Jul | 21 | Refreshing |
| Aug | 22 | Refreshing |
| Sep | 20 | Refreshing |
| Oct | 18 | Cool |
| Nov | 16 | Cool |
| Dec | 14 | Bracing |
UV index in Gujan-Mestras 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 Gujan-Mestras peaks around July 18 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. 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 | 7 | 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 | 7 | Very high |
| Sep | 5 | Moderate |
| Oct | 3 | Moderate |
| Nov | 2 | Low |
| Dec | 1 | Low |
Where is Gujan-Mestras?
Gujan-Mestras sits at 44.6°N, 1.1°W, 5 m above sea level, in France. The nearest listed city is La Teste-de-Buch, 6.0 km away.
Topography around Gujan-Mestras
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Gujan-Mestras.
Within 3 km, the terrain around Gujan-Mestras has only modest variations in elevation — a maximum elevation change of 26 m around an average of 6 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 96 m; within 80 km, only modest variations in elevation — a maximum elevation change of 149 m.
The land around Gujan-Mestras is covered by water (28%), trees (27%) and artificial surfaces (27%) within 3 km, trees (49%) and water (23%) within 16 km, and trees (44%), water (26%) and grassland (20%) 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 Gujan-Mestras (44.636°, -1.0681°, elevation 5 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.