Climate averages 1991–2020
Saint-Denis weather
in December.
A warm, wet month: the 4th warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a warm month in Saint-Denis: daytime highs average 27.5°C and nights cool to about 24.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 138 mm of rain on roughly 19 days, which makes December a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 22 min on an average December day.
The nearest other city in this atlas is Saint-Paul (23 km away). In December its highs average 27.5°C, about as warm as Saint-Denis, with 93 mm of rain.
Among the 3 cities listed in Reunion, Saint-Denis ranks joint 2nd of 3 for the warmest December highs and 2nd of 3 for the driest December (rainfall, lowest first). The mean December high of those 3 cities is 28.1°C; Saint-Denis is 0.6°C cooler than that mean.
From December to January, average highs rise by 0.6°C to 28.1°C, and monthly rainfall rises from 138 mm to 249 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Saint-Denis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.1°C24.9°C | 24.9°C | 249 | 21.7 | 13.213 h |
| February | 28.2°C25.1°C | 25.1°C | 245 | 22.1 | 12.813 h |
| March | 28.0°C24.8°C | 24.8°C | 219 | 22.0 | 12.212 h |
| April | 27.3°C23.9°C | 23.9°C | 78 | 16.7 | 11.612 h |
| May | 25.7°C22.2°C | 22.2°C | 74 | 16.0 | 11.111 h |
| June | 24.3°C20.5°C | 20.5°C | 40 | 11.0 | 10.911 h |
| July | 23.5°C19.5°C | 19.5°C | 36 | 11.9 | 11.011 h |
| August | 23.7°C19.3°C | 19.3°C | 34 | 10.0 | 11.411 h |
| September | 24.3°C19.8°C | 19.8°C | 36 | 10.1 | 12.012 h |
| October | 25.3°C21.0°C | 21.0°C | 47 | 11.0 | 12.613 h |
| November | 26.3°C22.3°C | 22.3°C | 84 | 15.4 | 13.113 h |
| December, selected | 27.5°C24.0°C | 24.0°C | 138 | 18.9 | 13.413 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Saint-Paul in DecemberReunion · 23 kmHigh 27.5°C · Low 23.6°C · 93 mm rain
- Saint-Pierre in DecemberReunion · 51 kmHigh 29.2°C · Low 24.3°C · 174 mm rain
- Vacoas in DecemberMauritius · 221 kmHigh 27.5°C · Low 22.1°C · 97 mm rain
- Port Louis in DecemberMauritius · 228 kmHigh 29.3°C · Low 24.5°C · 97 mm rain
- Toamasina in DecemberMadagascar · 703 kmHigh 27.4°C · Low 23.2°C · 186 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Saint-Denis) is explained once on the Saint-Denis year overview and on the Sources, method and limits page.