Saint-Louis in Summer
In summer (December, January and February), Saint-Louis sees average daytime highs around 25°C and overnight lows near 20°C, with 718 mm of rain over about 68 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Across summer, daytime highs hold fairly steady around 25°C. The sky is clear or mostly clear about 8% of the time across summer, and the air most often feels muggy.
Summer is Saint-Louis's weakest season of the year to visit on our travel score. For the whole year in context, see Saint-Louis's year-round climate.
- Avg daytime high
- 25°C
- warmest season of the year
- Avg overnight low
- 20°C
- Rainfall
- 718 mm
- 68 wet days
- Avg wind
- 7 km/h
- Travel score
- 4.6
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Saint-Louis in Summer
Across summer, daytime highs hold fairly steady around 25°C.
A typical summer day in Saint-Louis reaches about 25°C and drops to 20°C overnight. The warmest of the three months is January, the coolest December.
Saint-Louis weather by month
How the three summer months (December, January and February) 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 | 25° / 21° | 280 | 23.9 | 13.2 | 4.5 |
| Feb | 25° / 21° | 264 | 22.7 | 12.7 | 4.4 |
| Mar | 25° / 20° | 212 | 21.3 | 12.2 | 5.0 |
| Apr | 24° / 19° | 93 | 18.2 | 11.5 | 5.6 |
| May | 22° / 18° | 86 | 17.1 | 11 | 5.8 |
| Jun | 20° / 16° | 50 | 13.7 | 10.7 | 5.9 |
| Jul | 20° / 15° | 49 | 14.3 | 10.8 | 5.7 |
| Aug | 20° / 15° | 45 | 12.6 | 11.3 | 6.1 |
| Sep | 21° / 15° | 45 | 12 | 11.9 | 6.2 |
| Oct | 22° / 16° | 56 | 13.4 | 12.5 | 6.2 |
| Nov | 24° / 18° | 96 | 16.4 | 13 | 5.8 |
| Dec | 25° / 20° | 174 | 21.6 | 13.3 | 5.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 8% of the time across summer.
Chance of precipitation in Summer
Saint-Louis gets around 718 mm of rain over 68 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — 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 13 h 12 min in early December to 12 h 30 min by late February. 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 6.7 kWh/m².
Hazard calendar for Saint-Louis
In summer, Saint-Louis overlaps its cyclone and monsoon season. The full year is below, with each hazard's peak months called out.
Saint-Louis sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Saint-Louis's monsoon runs December–March, when most of the year's rain falls.
Is summer a good time to visit Saint-Louis?
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 Saint-Louis for sightseeing.
What to pack for Saint-Louis in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Saint-Louis sees daytime highs around 25°C and nights near 20°C. Pack rain gear and sun protection. Worth having: light clothes. About 68 days see rain.
Sea temperature near Saint-Louis in Summer
The nearest coast averages about 27°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea offshore is warmest in February at about 28°C and coldest in August near 23°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) | 28 | 28 | 28 | 27 | 26 | 25 | 24 | 23 | 23 | 24 | 25 | 27 |
| Comfort | Warm | Tropical | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Tropical |
| Mar | 28 | Warm |
| Apr | 27 | Warm |
| May | 26 | Warm |
| Jun | 25 | Warm |
| Jul | 24 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 23 | Refreshing |
| Oct | 24 | Warm |
| Nov | 25 | Warm |
| Dec | 27 | Warm |
UV index in Saint-Louis in Summer
Clear-sky midday UV across summer averages around 15 (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-Louis peaks around January 17 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 10 at about 6 (high).
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) | 17 | 15 | 13 | 10 | 8 | 6 | 6 | 9 | 10 | 12 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Extreme | Very high | High | High | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 17 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Extreme |
| May | 8 | Very high |
| Jun | 6 | High |
| Jul | 6 | High |
| Aug | 9 | Very high |
| Sep | 10 | Extreme |
| Oct | 12 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Where is Saint-Louis?
Saint-Louis sits at 21.3°S, 55.4°E, 40 m above sea level, in Reunion. The nearest listed city is Saint-Pierre, 9.0 km away.
Topography around Saint-Louis
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Louis.
Within 3 km, the terrain around Saint-Louis has only modest variations in elevation — a maximum elevation change of 244 m around an average of 55 m above sea level; within 16 km, extreme variations in elevation — a maximum elevation change of 2,578 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,030 m.
The land around Saint-Louis is covered by trees (40%) and artificial surfaces (20%) within 3 km, water (43%) and trees (36%) within 16 km, and water (79%) within 80 km.
Reunion travel facts
- 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-Louis (-21.2858°, 55.4112°, elevation 40 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.