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Saint-Denis, Réunion climate
Am Tropical monsoon
Saint-Denis has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is February with an average daily high near 30°C, while the coldest is August averaging around 18°C at night. Precipitation totals about 1618 mm a year and is strongly seasonal — February alone averages 298 mm while October barely receives 41 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Saint-Denis climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 29 | 28 | 26 | 25 | 25 | 26 | 27 | 28 | 29 |
| Avg temp (°C) | 27 | 27 | 26 | 26 | 24 | 22 | 22 | 22 | 22 | 23 | 25 | 26 |
| Avg low (°C) | 23 | 24 | 23 | 22 | 20 | 19 | 18 | 18 | 18 | 20 | 21 | 22 |
| Precipitation (mm) | 297 | 298 | 270 | 139 | 99 | 85 | 56 | 69 | 50 | 41 | 59 | 154 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 29 | 28 | 26 |
| Avg temp (°C) | 27 | 27 | 26 | 26 | 24 | 22 |
| Avg low (°C) | 23 | 24 | 23 | 22 | 20 | 19 |
| Precipitation (mm) | 297 | 298 | 270 | 139 | 99 | 85 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 25 | 25 | 26 | 27 | 28 | 29 |
| Avg temp (°C) | 22 | 22 | 22 | 23 | 25 | 26 |
| Avg low (°C) | 18 | 18 | 18 | 20 | 21 | 22 |
| Precipitation (mm) | 56 | 69 | 50 | 41 | 59 | 154 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 15 | 15 | 15 | 12 | 11 | 10 | 11 | 11 | 9 | 10 | 8 | 12 |
| Days with high ≥ 32°C (days) | 1 | 1 | 1 | 0.2 | — | — | — | — | — | — | — | 0.7 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 15 | 15 | 15 | 12 | 11 | 10 |
| Days with high ≥ 32°C (days) | 1 | 1 | 1 | 0.2 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 11 | 11 | 9 | 10 | 8 | 12 |
| Days with high ≥ 32°C (days) | — | — | — | — | — | 0.7 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 59 | 54 | 50 | 49 | 48 | 48 | 46 | 43 | 42 | 42 | 50 |
| Relative humidity (%) | 80 | 81 | 82 | 82 | 80 | 78 | 78 | 78 | 76 | 76 | 75 | 76 |
| Wind speed (mph) | 10.3 | 10.5 | 10.3 | 10.1 | 9.7 | 10.8 | 11.5 | 11.1 | 10.5 | 10.1 | 9.1 | 9.3 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 61 | 59 | 54 | 50 | 49 | 48 |
| Relative humidity (%) | 80 | 81 | 82 | 82 | 80 | 78 |
| Wind speed (mph) | 10.3 | 10.5 | 10.3 | 10.1 | 9.7 | 10.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 48 | 46 | 43 | 42 | 42 | 50 |
| Relative humidity (%) | 78 | 78 | 76 | 76 | 75 | 76 |
| Wind speed (mph) | 11.5 | 11.1 | 10.5 | 10.1 | 9.1 | 9.3 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 26 years of daily observations at ST Denis Gillot, a weather station, about 6 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.