Saint-Laurent-du-Maroni in Summer
In summer (June, July and August), Saint-Laurent-du-Maroni sees average daytime highs around 30°C and overnight lows near 23°C, with 734 mm of rain over about 74 wet days across the season. It is the 2nd-warmest season and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 18% of the time across summer, and the air most often feels oppressive.
Summer is Saint-Laurent-du-Maroni's weakest season of the year to visit on our travel score. Saint-Laurent-du-Maroni has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Saint-Laurent-du-Maroni's year-round climate.
- Avg daytime high
- 30°C
- 2nd-warmest season
- Avg overnight low
- 23°C
- Rainfall
- 734 mm
- 74 wet days
- Avg wind
- 7 km/h
- Travel score
- 3.2
- weakest season of the year
- Months
- Jun · Jul · Aug
Temperature in Saint-Laurent-du-Maroni in Summer
Across summer, daytime highs hold fairly steady around 30°C.
A typical summer day in Saint-Laurent-du-Maroni reaches about 30°C and drops to 23°C overnight. The warmest of the three months is August, the coolest July.
How summer really feels in Saint-Laurent-du-Maroni
Once humidity and wind are folded in, summer brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Saint-Laurent-du-Maroni 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 | 29° / 23° | 164 | 21.4 | 11.7 | 4.1 |
| Feb | 29° / 23° | 123 | 17 | 11.8 | 4.4 |
| Mar | 29° / 23° | 106 | 17.4 | 12 | 4.4 |
| Apr | 29° / 24° | 186 | 21.3 | 12.1 | 3.7 |
| May | 30° / 24° | 320 | 27.4 | 12.2 | 3.1 |
| Jun | 30° / 23° | 332 | 28.1 | 12.3 | 2.9 |
| Jul | 30° / 23° | 254 | 26.5 | 12.3 | 3.1 |
| Aug | 31° / 23° | 148 | 19.5 | 12.2 | 3.6 |
| Sep | 31° / 23° | 88 | 14.6 | 12 | 3.9 |
| Oct | 31° / 23° | 100 | 16.1 | 11.9 | 3.8 |
| Nov | 31° / 23° | 172 | 21.9 | 11.7 | 3.3 |
| Dec | 29° / 23° | 203 | 25.1 | 11.7 | 3.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 18% of the time across summer.
Chance of precipitation in Summer
Saint-Laurent-du-Maroni gets around 734 mm of rain over 74 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 12 h 18 min in early June to 12 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 5.0 kWh/m².
Is summer a good time to visit Saint-Laurent-du-Maroni?
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 weaker month for outdoor sightseeing in Saint-Laurent-du-Maroni.
What to pack for Saint-Laurent-du-Maroni in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Saint-Laurent-du-Maroni sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 74 days see rain.
Sea temperature near Saint-Laurent-du-Maroni in Summer
The nearest coast averages about 28°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 43 km away) is warmest in August at about 28°C and coldest in January near 26°C.
The water stays above 20°C all year — warm enough for a swim any month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 26 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 27 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Warm | Tropical | Tropical | Tropical | Tropical | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 27 | Warm |
| Mar | 27 | Warm |
| Apr | 27 | Warm |
| May | 27 | Warm |
| Jun | 28 | Warm |
| Jul | 28 | Tropical |
| Aug | 28 | Tropical |
| Sep | 28 | Tropical |
| Oct | 28 | Tropical |
| Nov | 28 | Warm |
| Dec | 27 | Warm |
UV index in Saint-Laurent-du-Maroni in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Saint-Laurent-du-Maroni peaks around March 24 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 11 at about 10 (extreme).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 13 | 13 | 14 | 14 | 13 | 11 | 11 | 11 | 12 | 12 | 11 | 10 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 13 | Extreme |
| Mar | 14 | Extreme |
| Apr | 14 | Extreme |
| May | 13 | Extreme |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 10 | Extreme |
Air quality in Saint-Laurent-du-Maroni in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Saint-Laurent-du-Maroni is worst in February — around 24 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (August, 7 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 22 | 24 | 24 | 24 | 19 | 12 | 8 | 7 | 10 | 14 | 12 | 18 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good | Moderate | Good | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 22 | Moderate |
| Feb | 24 | Moderate |
| Mar | 24 | Moderate |
| Apr | 24 | Moderate |
| May | 19 | Moderate |
| Jun | 12 | Good |
| Jul | 8 | Good |
| Aug | 7 | Good |
| Sep | 10 | Good |
| Oct | 14 | Moderate |
| Nov | 12 | Good |
| Dec | 18 | Moderate |
Where is Saint-Laurent-du-Maroni?
Saint-Laurent-du-Maroni sits at 5.5°N, 54.0°W, 10 m above sea level, in French Guiana. The nearest listed city is Blauwgrond, 126 km away.
Topography around Saint-Laurent-du-Maroni
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Laurent-du-Maroni.
Within 3 km, the terrain around Saint-Laurent-du-Maroni has only modest variations in elevation — a maximum elevation change of 48 m around an average of 8 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 87 m; within 80 km, significant variations in elevation — a maximum elevation change of 574 m.
The land around Saint-Laurent-du-Maroni is covered by water (41%) and trees (34%) within 3 km, trees (86%) within 16 km, and trees (73%) and water (23%) within 80 km.
French Guiana travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / E
- 220 V · 50 Hz
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 Saint-Laurent-du-Maroni (5.5015°, -54.0292°, elevation 10 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.