Saint-Denis in Summer
In summer (December, January and February), Saint-Denis sees average daytime highs around 26°C and overnight lows near 22°C, with 632 mm of rain over about 62 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 26°C. The sky is clear or mostly clear about 16% of the time across summer, and the air most often feels muggy.
Summer is Saint-Denis's weakest season of the year to visit on our travel score. Saint-Denis 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-Denis's year-round climate.
- Avg daytime high
- 26°C
- warmest season of the year
- Avg overnight low
- 22°C
- Rainfall
- 632 mm
- 62 wet days
- Avg wind
- 8 km/h
- Travel score
- 4.9
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Saint-Denis in Summer
Across summer, daytime highs hold fairly steady around 26°C.
A typical summer day in Saint-Denis reaches about 26°C and drops to 22°C overnight. The warmest of the three months is February, the coolest December.
Saint-Denis 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 | 26° / 22° | 251 | 21.7 | 13.1 | 4.9 |
| Feb | 26° / 22° | 244 | 21.9 | 12.7 | 4.5 |
| Mar | 26° / 22° | 219 | 22 | 12.1 | 5.0 |
| Apr | 25° / 21° | 78 | 16.7 | 11.5 | 5.8 |
| May | 23° / 19° | 74 | 16 | 11 | 6.2 |
| Jun | 21° / 17° | 40 | 11 | 10.8 | 6.6 |
| Jul | 21° / 16° | 36 | 11.9 | 10.9 | 6.5 |
| Aug | 21° / 16° | 34 | 10 | 11.3 | 6.8 |
| Sep | 21° / 17° | 36 | 10.1 | 11.9 | 6.8 |
| Oct | 23° / 18° | 47 | 11 | 12.5 | 6.7 |
| Nov | 24° / 19° | 84 | 15.4 | 13 | 6.1 |
| Dec | 25° / 21° | 138 | 18.9 | 13.2 | 5.4 |
Cloud cover in Summer
The sky is clear or mostly clear about 16% of the time across summer.
Chance of precipitation in Summer
Saint-Denis gets around 632 mm of rain over 62 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 8 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 6.8 kWh/m².
Hazard calendar for Saint-Denis
In summer, Saint-Denis overlaps its cyclone and monsoon season. The full year is below, with each hazard's peak months called out.
Saint-Denis sits in the South Indian Ocean cyclone belt; the season peaks January–March.
Saint-Denis's monsoon runs December–March, when most of the year's rain falls.
Is summer a good time to visit Saint-Denis?
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-Denis for sightseeing.
What to pack for Saint-Denis in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Saint-Denis sees daytime highs around 26°C and nights near 22°C. Pack rain gear and sun protection. Worth having: light clothes. About 62 days see rain.
Sea temperature near Saint-Denis 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 offshore is warmest in February at about 28°C and coldest in August near 24°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 | 28 | 27 | 25 | 24 | 24 | 24 | 24 | 25 | 27 |
| Comfort | Warm | Tropical | Tropical | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Warm | Warm | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 28 | Warm |
| Feb | 28 | Tropical |
| Mar | 28 | Tropical |
| Apr | 28 | Warm |
| May | 27 | Warm |
| Jun | 25 | Warm |
| Jul | 24 | Warm |
| Aug | 24 | Refreshing |
| Sep | 24 | Refreshing |
| Oct | 24 | Warm |
| Nov | 25 | Warm |
| Dec | 27 | Warm |
UV index in Saint-Denis 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-Denis peaks around January 18 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 23 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) | 16 | 15 | 13 | 10 | 8 | 6 | 6 | 9 | 10 | 12 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | High | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 16 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| 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-Denis?
Saint-Denis sits at 20.9°S, 55.5°E, 44 m above sea level, in Reunion. The nearest listed city is Sainte-Marie, 11 km away.
Topography around Saint-Denis
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Saint-Denis.
Within 3 km, the terrain around Saint-Denis has large variations in elevation — a maximum elevation change of 635 m around an average of 104 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,258 m; within 80 km, extreme variations in elevation — a maximum elevation change of 3,030 m.
The land around Saint-Denis is covered by water (40%), trees (33%) and artificial surfaces (24%) within 3 km, water (55%) and trees (34%) within 16 km, and water (78%) 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-Denis (-20.8823°, 55.4504°, elevation 44 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.