Weather in St Denis in September 2025
Average weather
Average temperature in St Denis in September
The temperature in September is +27°C on average, with a range between a maximum of +28°C during the day and a minimum of +18°C at night.
The average maximum temperature goes up 20% by the end of the month, compared with the beginning of the month, from +26°C to +28°C.
Is St Denis warm or cold in September?
St Denis is typically warm in September.
Maximum temperatures go up compared to the previous month from +23°C to +24°C. The minimum temperature also goes up from +19°C to +19°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in St Denis:
Climate in St Denis in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +23°C | +24°C | +25°C | ||||
| Min. temperature | ||||||
| +15°C | +15°C | +16°C | ||||
| Max. temperature | ||||||
| +28°C | +29°C | +30°C | ||||
| Rainfall | ||||||
| 44 mm | 42 mm | 56 mm | ||||
| Wind | ||||||
| 4 m/s | 4 m/s | 4 m/s | ||||
| Humidity | ||||||
| 71% | 71% | 72% | ||||
| Air pressure | ||||||
| 1021 HPa | 1020 HPa | 1019 HPa | ||||
| Sunny days | ||||||
| 4 | 4 | 4 | ||||
| Cloudy days | ||||||
| 7 | 7 | 8 | ||||
| Rainy days | ||||||
| 20 | 19 | 20 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as good as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +23°C to +24°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 44 mm to 42 mm. Humidity levels don’t change as the month goes on, averaging around 71%. The average wind speed doesn’t change much during September, staying around 4 m/s. The amount of sunny days stay about the same, averaging 4 sunny days during the month.
October brings much the same weather, it remains good.
Wind
The average wind speed is 6 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in St Denis is gradually increasing during September, going from 5 m/s to 6 m/s over the course of the month.
Rain
How was the weather last September in St Denis?
Climate Change over Years
The climate in St Denis in September has not changed much over the last 43 years.
The average temperature was the lowest in 1983 (+24°C) and the highest in 2019 (+28°C). The driest year was 1992 with only 801 mm of rainfall, and the wettest year was 2018 with 2301 mm.
FAQ
Is September a good time to visit St Denis?
Can you sunbathe in St Denis in September?
Is St Denis rainy in September?
Is it sunny in St Denis in September?
Other cities in Réunion
Monthly weather in St Denis
Source of the data
For this page, we’ve looked at the typical weather in St Denis, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
