Saint-Denis weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: June – December
What is the weather like in Saint-Denis in September?
In September, Saint-Denis is warm: daytime highs average 24 °C, and nights cool down to about 20 °C. The sea averages 23.7 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain is frequent, with about 10 rainy days and 35 mm in total. All in all, September is an excellent month for a holiday in Saint-Denis.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 81 | 85 | 82 |
| Day | 23° | 24° | 25° |
| Night | 19° | 20° | 21° |
| Sea | 24° | 24° | 24° |
| Sun | 8 h | 8 h | 8 h |
| Rain days | 11 | 10 | 12 |
More details for September
- Daylight
- 11 h 57 min06:15 – 18:12
- UV index
- 10 · very highclear sky, noon (estimate)All months
- Muggy days
- 5 daysdew point 18 °C or moreAll months
- Wind
- 11 km/haverage daily peakAll months
- Cloud cover
- 38 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Time zone
- UTC+4Indian/Reunion
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %85 %
- Few rainy daysweight 30 %59 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Rain jacket or umbrella
Saint-Denis in September: quick answers
Is Saint-Denis hot in September?
Warm rather than hot: in September, daytime highs in Saint-Denis average 24 °C and nights cool to about 20 °C.
Can you swim in Saint-Denis in September?
Yes. In September the sea averages 23.7 °C – pleasant for swimming.
Does it rain much in Saint-Denis in September?
Rain is frequent, with about 10 rainy days and 35 mm in total.
Saint-Denis month by month
The whole year in Saint-DenisAll destinations: RéunionWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences