Climate and average weather in Gujan-Mestras
In Gujan-Mestras, the summers are warm, showery, and mostly clear and the winters are cool and partly cloudy.
Over the course of the year, the temperature in Gujan-Mestras typically varies from 5°C to 26°C, and is rarely below -0°C or above 31°C. August is the hottest month of the year, while January is the coldest.
Based on the travel score, the best time of year to visit Gujan-Mestras for warm-weather activities is from mid May to mid October.
- Hottest
- Aug
- 26°
- Coldest
- Jan
- 5°
- Wettest
- Nov
- 88 mm
- Driest
- Jul
- 46 mm
- Rain / yr
- 778 mm
- 124 wet days
- Daylight
- 8.6–15.4 h
- shortest–longest
- Elevation
- 5 m
- 44.6°N
- Clearest
- Aug
- 46% cloud
Gujan-Mestras weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around mid May to mid October.
Temperature through the year
Daily average highs and lows in Gujan-Mestras, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 3.7 months, from June 3 to September 22, with daily high temperatures above 22°C. The hottest month of the year in Gujan-Mestras is August, with an average high of 26°C and low of 18°C.
The cool season lasts 3.6 months, from November 19 to March 7, with daily high temperatures below 13°C. The coldest month of the year in Gujan-Mestras is January, with an average low of 5°C and high of 10°C.
Days typically run about 7°C warmer than nights, with the widest day–night swing (around 8°C) in August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 10 | 11 | 14 | 17 | 20 | 23 | 25 | 26 | 23 | 19 | 14 | 11 |
| Avg low (°C) | 5 | 5 | 7 | 9 | 13 | 16 | 18 | 18 | 15 | 12 | 8 | 6 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| Jan | 10 | 5 |
| Feb | 11 | 5 |
| Mar | 14 | 7 |
| Apr | 17 | 9 |
| May | 20 | 13 |
| Jun | 23 | 16 |
| Jul | 25 | 18 |
| Aug | 26 | 18 |
| Sep | 23 | 15 |
| Oct | 19 | 12 |
| Nov | 14 | 8 |
| Dec | 11 | 6 |
Average hourly temperature in Gujan-Mestras
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on August afternoons, near 26°C, and coldest before dawn in January, near 5°C.
Gujan-Mestras weather by month
Every month at a glance. Click a month for its detailed page.
| 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 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Gujan-Mestras gets about 778 mm of precipitation a year. On a typical day the chance of rain is often wet, but that rises and falls sharply with the seasons.
The wetter season lasts 4.2 months, from around Oct 8 to Feb 12, peaking in November at about 42% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jul 21.
November is the wettest month by volume, with 88 mm over about 13 wet days; July is the driest, with 46 mm.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 37 | 34 | 34 | 39 | 38 | 32 | 25 | 25 | 31 | 35 | 40 | 38 |
| Rain days | 12 | 9 | 11 | 12 | 12 | 9 | 8 | 8 | 9 | 11 | 13 | 12 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 37 | 12 |
| Feb | 34 | 9 |
| Mar | 34 | 11 |
| Apr | 39 | 12 |
| May | 38 | 12 |
| Jun | 32 | 9 |
| Jul | 25 | 8 |
| Aug | 25 | 8 |
| Sep | 31 | 9 |
| Oct | 35 | 11 |
| Nov | 40 | 13 |
| Dec | 38 | 12 |
Monthly rainfall
Over a full year, Gujan-Mestras collects about 778 mm of rain across 124 wet days — roughly 65 mm in an average month.
It doesn’t fall evenly. November is the wettest month with 88 mm, while July is the driest at just 46 mm. The three wettest months alone bring about 31% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (mm) | 72 | 52 | 54 | 66 | 70 | 63 | 46 | 53 | 63 | 73 | 88 | 77 |
| Rain days | 12 | 9 | 11 | 12 | 12 | 9 | 8 | 8 | 9 | 11 | 13 | 12 |
| Rainfall (mm) | Rain days | |
|---|---|---|
| Jan | 72 | 12 |
| Feb | 52 | 9 |
| Mar | 54 | 11 |
| Apr | 66 | 12 |
| May | 70 | 12 |
| Jun | 63 | 9 |
| Jul | 46 | 8 |
| Aug | 53 | 8 |
| Sep | 63 | 9 |
| Oct | 73 | 11 |
| Nov | 88 | 13 |
| Dec | 77 | 12 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Gujan-Mestras, the average share of the sky covered by clouds shows significant seasonal variation over the course of the year.
The clearer part of the year begins around May 23 and lasts for 4.5 months, ending around October 5. The clearest month is August, when the sky is clear, mostly clear, or partly cloudy 64% of the time on average.
The cloudier part of the year begins around October 6 and lasts for 6.1 months, ending around April 9. The cloudiest month is January, when it is overcast or mostly cloudy 67% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 33 | 40 | 44 | 44 | 43 | 53 | 61 | 64 | 56 | 44 | 36 | 34 |
| Cloudier (%) | 67 | 60 | 56 | 56 | 57 | 47 | 39 | 36 | 44 | 56 | 64 | 66 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 33 | 67 |
| Feb | 40 | 60 |
| Mar | 44 | 56 |
| Apr | 44 | 56 |
| May | 43 | 57 |
| Jun | 53 | 47 |
| Jul | 61 | 39 |
| Aug | 64 | 36 |
| Sep | 56 | 44 |
| Oct | 44 | 56 |
| Nov | 36 | 64 |
| Dec | 34 | 66 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 16, brings about 15 h 24 min of light; the shortest, around December 15, only 8 h 36 min — a swing of roughly 6 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.0 | 10.1 | 11.6 | 13.2 | 14.6 | 15.3 | 15.0 | 13.9 | 12.3 | 10.7 | 9.4 | 8.7 |
| Sunrise (AM) | 8:44 | 8:15 | 7:25 | 6:27 | 5:42 | 5:24 | 5:38 | 6:12 | 6:49 | 7:27 | 8:09 | 8:41 |
| Sunset (PM) | 5:43 | 6:23 | 7:02 | 7:42 | 8:19 | 8:45 | 8:42 | 8:05 | 7:08 | 6:11 | 5:30 | 5:20 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 9.0 | 8:44 | 5:43 |
| Feb | 10.1 | 8:15 | 6:23 |
| Mar | 11.6 | 7:25 | 7:02 |
| Apr | 13.2 | 6:27 | 7:42 |
| May | 14.6 | 5:42 | 8:19 |
| Jun | 15.3 | 5:24 | 8:45 |
| Jul | 15.0 | 5:38 | 8:42 |
| Aug | 13.9 | 6:12 | 8:05 |
| Sep | 12.3 | 6:49 | 7:08 |
| Oct | 10.7 | 7:27 | 6:11 |
| Nov | 9.4 | 8:09 | 5:30 |
| Dec | 8.7 | 8:41 | 5:20 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Gujan-Mestras averages about 9 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 6 and 13 days.
The sunnier stretch runs 3.7 months, from around Jun 9 to Sep 30. The sunniest month is September, with roughly 12 sunny days (mixed).
The greyest month is January, down near 6 sunny days — about 49% fewer than the September peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 6 | 7 | 9 | 7 | 8 | 9 | 13 | 13 | 11 | 9 | 6 | 7 |
| Sky | Gloomy | Gloomy | Mixed | Gloomy | Gloomy | Mixed | Mixed | Mixed | Mixed | Mixed | Gloomy | Gloomy |
| Sunny days | Sky | |
|---|---|---|
| Jan | 6 | Gloomy |
| Feb | 7 | Gloomy |
| Mar | 9 | Mixed |
| Apr | 7 | Gloomy |
| May | 8 | Gloomy |
| Jun | 9 | Mixed |
| Jul | 13 | Mixed |
| Aug | 13 | Mixed |
| Sep | 11 | Mixed |
| Oct | 9 | Mixed |
| Nov | 6 | Gloomy |
| Dec | 7 | Gloomy |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Gujan-Mestras, how humid it feels changes dramatically over the year.
The more humid part of the year lasts 4.1 months, from around June 4 to October 5. The muggiest month is July, when the air feels humid, muggy or worse about 53% of the time.
The most comfortable stretch runs from around October 6 to June 3, and April is the most comfortable month — the air is dry or comfortable 100% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 97 | 73 | 32 | 12 | 11 | 32 | 57 | 93 | 99 |
| Comfortable (%) | 0 | 0 | 0 | 3 | 23 | 41 | 35 | 34 | 40 | 34 | 7 | 1 |
| Humid (%) | 0 | 0 | 0 | 0 | 4 | 24 | 43 | 38 | 23 | 8 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 3 | 10 | 16 | 4 | 0 | 0 | 0 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 | 0 |
| Apr | 97 | 3 | 0 | 0 | 0 |
| May | 73 | 23 | 4 | 0 | 0 |
| Jun | 32 | 41 | 24 | 3 | 0 |
| Jul | 12 | 35 | 43 | 10 | 0 |
| Aug | 11 | 34 | 38 | 16 | 1 |
| Sep | 32 | 40 | 23 | 4 | 0 |
| Oct | 57 | 34 | 8 | 0 | 0 |
| Nov | 93 | 7 | 0 | 0 | 0 |
| Dec | 99 | 1 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Wind in Gujan-Mestras is steady company: average speeds sit near 11 km/h — calm — in every month of the year, with no meaningful windy or calm season.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 12 | 12 | 12 | 12 | 11 | 11 | 10 | 10 | 10 | 11 | 12 | 12 |
| Feels | light breeze | light breeze | light breeze | calm | calm | calm | calm | calm | calm | calm | calm | light breeze |
| Wind speed (km/h) | Feels | |
|---|---|---|
| Jan | 12 | light breeze |
| Feb | 12 | light breeze |
| Mar | 12 | light breeze |
| Apr | 12 | calm |
| May | 11 | calm |
| Jun | 11 | calm |
| Jul | 10 | calm |
| Aug | 10 | calm |
| Sep | 10 | calm |
| Oct | 11 | calm |
| Nov | 12 | calm |
| Dec | 12 | light breeze |
Best time to visit Gujan-Mestras
To characterize how pleasant the weather is in Gujan-Mestras throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late May, Gujan-Mestras is still near the start of its best-weather window — great conditions with the peak-season crowds not yet at full swing.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 18°C and 28°C. Based on this score, the best time of year to visit Gujan-Mestras for general outdoor tourist activities is from mid May to mid October, with a peak score in the first week of September.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 2.3 | 2.8 | 4.2 | 5.1 | 6.0 | 7.0 | 7.3 | 7.3 | 7.0 | 5.9 | 3.8 | 2.6 |
| Rating | poor | poor | fair | fair | good | good | good | good | good | good | fair | poor |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 2.3 | poor |
| Feb | 2.8 | poor |
| Mar | 4.2 | fair |
| Apr | 5.1 | fair |
| May | 6.0 | good |
| Jun | 7.0 | good |
| Jul | 7.3 | good |
| Aug | 7.3 | good |
| Sep | 7.0 | good |
| Oct | 5.9 | good |
| Nov | 3.8 | fair |
| Dec | 2.6 | poor |
The beach/pool score favors clear, rainless days with daytime highs between 24°C and 34°C. Based on this score, the best time of year to visit Gujan-Mestras for hot-weather activities is from mid June to mid September, with a peak score in the last week of July.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Gujan-Mestras, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around August (highs near 26°C), the essentials are light clothes, rain gear and sun protection. In the cold season around January (highs near 10°C), pack a warm layer and rain gear.
In August, Gujan-Mestras sees daytime highs around 26°C and nights near 18°C. Worth packing: light clothes, rain gear and sun protection. About 8 days see rain.
Sea temperature near Gujan-Mestras
Average ocean temperature at the nearest coast, month by month, banded into swim-comfort zones — the other half of the beach question.
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 (midday) in Gujan-Mestras by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
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 |
Average hourly UV index in Gujan-Mestras
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in July the burn window is concentrated in the middle of the day: about 8 hours a day reach index 3 (protection recommended), and 4.5 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 0 | 0 | 4.5 | 6 | 7 | 8 | 8 | 7 | 5 | 1.5 | 0 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 0 | 1 | 3.5 | 4.5 | 3.5 | 0 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 0 | 0 |
| Mar | 4.5 | 0 |
| Apr | 6 | 0 |
| May | 7 | 1 |
| Jun | 8 | 3.5 |
| Jul | 8 | 4.5 |
| Aug | 7 | 3.5 |
| Sep | 5 | 0 |
| Oct | 1.5 | 0 |
| Nov | 0 | 0 |
| Dec | 0 | 0 |
Growing season
Gujan-Mestras is mild enough that a frost-free day stays more likely than not even in midwinter.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 92 | 93 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 99 | 94 |
| Frost nights | 17 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 10 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 92 | 17 |
| Feb | 93 | 2 |
| Mar | 99 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 99 | 0 |
| Dec | 94 | 10 |
Growing degree days
Growing degree days tally heat above 10°C: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Gujan-Mestras banks about 1,780 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around August.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°C·days) | 0 | 0 | 24 | 90 | 196 | 285 | 355 | 359 | 268 | 169 | 35 | 0 |
| Growing degree days (°C·days) | |
|---|---|
| Jan | 0 |
| Feb | 0 |
| Mar | 24 |
| Apr | 90 |
| May | 196 |
| Jun | 285 |
| Jul | 355 |
| Aug | 359 |
| Sep | 268 |
| Oct | 169 |
| Nov | 35 |
| Dec | 0 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Gujan-Mestras receives about 3.9 kWh/m² a day of solar energy on average — moderate — with a clear seasonal swing between 1.2 and 6.3 kWh/m².
The brighter stretch of the year lasts 6.2 months, from around Mar 18 to Sep 22. The brightest month is June, averaging about 6.2 kWh/m² (intense).
The dimmest month is December, down near 1.3 kWh/m² — roughly 79% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 1.5 | 2.4 | 3.7 | 5.0 | 5.8 | 6.3 | 6.2 | 5.5 | 4.3 | 2.7 | 1.7 | 1.3 |
| Level | Dim | Moderate | Moderate | Bright | Bright | Intense | Intense | Bright | Bright | Moderate | Dim | Dim |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 1.5 | Dim |
| Feb | 2.4 | Moderate |
| Mar | 3.7 | Moderate |
| Apr | 5.0 | Bright |
| May | 5.8 | Bright |
| Jun | 6.3 | Intense |
| Jul | 6.2 | Intense |
| Aug | 5.5 | Bright |
| Sep | 4.3 | Bright |
| Oct | 2.7 | Moderate |
| Nov | 1.7 | Dim |
| Dec | 1.3 | Dim |
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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).