September weather forecastSaint-Louis, Reunion
September weather for Saint-Louis, Reunion: The month with the least rainfall in Saint-Louis, Reunion, is September, when the rain falls for 9.5 days and typically collects 10mm (0.39") of precipitation. The months with the lowest humidity in Saint-Louis are July through September, with an average relative humidity of 77%.
September
Weather in September
Saint-Louis, Reunion greets September with a warmer embrace as compared to previous chill months. However, a key highlight of the month's weather is its low rainfall, only slightly above August's, at 10mm (0.39"). The humble rise in temperature gradually marks the onset of summer, replacing the winter blues with warmer hues. Longer daylight hours give residents and visitors more time to enjoy the outdoor attractions of the city. As September transitions into October, anticipation of further rise in temperature and rainfall remains.Temperature
The arrival of September in Saint-Louis, Reunion, coincides with an average high-temperature of a still agreeable 21.7°C (71.1°F), indicating a minimal shift from August's 21.5°C (70.7°F). In Saint-Louis, a slight decrease from the daytime peak is noted during the month of September, with an average low-temperature of 19.5°C (67.1°F).Humidity
The months with the lowest humidity in Saint-Louis are July through September, with an average relative humidity of 77%.Rainfall
The month with the least rainfall in Saint-Louis, Reunion, is September, when the rain falls for 9.5 days and typically collects 10mm (0.39") of precipitation.Daylight
The average length of the day in September is 11h and 59min.On the first day of September in Saint-Louis, sunrise is at 06:27 and sunset at 18:09. On the last day of the month, sunrise is at 05:59 and sunset at 18:16 +04.
Sunshine
The average sunshine in September is 9.3h.UV index
The months with the lowest UV index in Saint-Louis are January, March through December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for average individuals.Note: The UV index of 6 during September leads to these advisories:
Stay clear of intense sun exposure. Solar protection is of utmost significance. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Saint-Louis, Reunion
- Average high temperature in September: 21.7°C
The warmest months (with the highest average high temperature) are January, February and March (26.3°C).
The month with the lowest average high temperature is July (21.3°C).
- Average low temperature in September: 19.5°C
The months with the highest average low temperature are January and February (24.3°C).
The coldest month (with the lowest average low temperature) is July (18.8°C).
Average pressure in September
Saint-Louis, Reunion
- Average pressure in September: 1020.9mbar
The month with the highest atmospheric pressure is August (1021.5mbar).
The month with the lowest atmospheric pressure is February (1011.1mbar).
Average wind speed in September
Saint-Louis, Reunion
- Average wind speed in September: 18.2km/h
The windiest month (with the highest average wind speed) is July (19.8km/h).
The calmest month (with the lowest average wind speed) is November (13.4km/h).
Average humidity in September
Saint-Louis, Reunion
- Average humidity in September: 77%
The months with the highest relative humidity are January, February, March and April (81%).
The months with the lowest relative humidity are July, August and September (77%).
Average rainfall in September
Saint-Louis, Reunion
- Average rainfall in September: 10mm
The wettest month (with the highest rainfall) is January (162mm).
The driest month (with the least rainfall) is September (10mm).
Average rainfall days in September
Saint-Louis, Reunion
- Average rainfall days in September: 9.5 days
The month with the highest number of rainy days is March (24.9 days).
The month with the least rainy days is September (9.5 days).
Average daylight in September /
Average sunshine in September
Saint-Louis, Reunion
- Average daylight in September: 12h and 0min
The month with the longest days is December (Average daylight: 13h and 24min).
The month with the shortest days is June (Average daylight: 10h and 54min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is October (Average sunshine: 10h and 54min).
The month with the least sunshine is May (Average sunshine: 6h and 54min).
Average sunshine days in September
Saint-Louis, Reunion
- Average sunshine days in September: 12.8 days
The month with the most sunshine days is August (13.5 days).
The month with the least sunshine days is February (1.7 days).
Average UV index in September
Saint-Louis, Reunion
- Average UV index in September: 6
The month with the highest UV index is February (UV index 7).
The months with the lowest UV index are January, March, April, May, June, July, August, September, October, November and December (UV index 6).
Average cloud cover in September
Saint-Louis, Reunion
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 21).
Average visibility in September
Saint-Louis, Reunion
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
