September weather forecastHell-Bourg, Reunion
September
Weather in September
The transition from winter to summer commences in September. The average temperatures start climbing while the rainfall rises slightly to 26mm (1.02"). An increase in daylight hours correlates with lowering of cloud percentage and an increase in the UV index. Stunning outdoor conditions arrive, as Hell-Bourg transitions into its beautiful summer months.Temperature
With the onset of September in Hell-Bourg, the average high-temperature registers at a still pleasant 21°C (69.8°F), subtly different from August's 20.4°C (68.7°F). Hell-Bourg's nighttime temperatures in September display a slight drop from daytime highs, averaging to a refreshing 18.5°C (65.3°F).Humidity
The months with the lowest humidity are August and September, with an average relative humidity of 79%.Rainfall
September is the month with the least rainfall. Rain falls for 18.5 days and accumulates 26mm (1.02") of precipitation.Daylight
In Hell-Bourg, the average length of the day in September is 11h and 59min.On the first day of September, sunrise is at 06:26 and sunset at 18:09. On the last day of the month, sunrise is at 05:59 and sunset at 18:16 +04.
Sunshine
In September, the average sunshine in Hell-Bourg is 8.9h.UV index
June through October, with an average maximum UV index of 5, are months with the lowest UV index. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: A daily high UV index of 5 in September leads to these guidelines:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. Around midday, solar radiation is most harmful; hence, exposure should be limited. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hell-Bourg, Reunion
- Average high temperature in September: 21°C
The warmest month (with the highest average high temperature) is January (25.7°C).
The month with the lowest average high temperature is August (20.4°C).
- Average low temperature in September: 18.5°C
The month with the highest average low temperature is February (23.6°C).
The coldest month (with the lowest average low temperature) is August (18.2°C).
Average pressure in September
Hell-Bourg, Reunion
- Average pressure in September: 1020.7mbar
The month with the highest atmospheric pressure is August (1021.3mbar).
The month with the lowest atmospheric pressure is February (1011mbar).
Average wind speed in September
Hell-Bourg, Reunion
- Average wind speed in September: 15.7km/h
The windiest month (with the highest average wind speed) is July (18km/h).
The calmest months (with the lowest average wind speed) are November and December (12.4km/h).
Average humidity in September
Hell-Bourg, Reunion
- Average humidity in September: 79%
The months with the highest relative humidity are February and March (84%).
The months with the lowest relative humidity are August and September (79%).
Average rainfall in September
Hell-Bourg, Reunion
- Average rainfall in September: 26mm
The wettest month (with the highest rainfall) is January (199mm).
The driest month (with the least rainfall) is September (26mm).
Average rainfall days in September
Hell-Bourg, Reunion
- Average rainfall days in September: 18.5 days
The month with the highest number of rainy days is March (27.7 days).
The month with the least rainy days is September (18.5 days).
Average daylight in September /
Average sunshine in September
Hell-Bourg, 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: 8h and 54min
The month with the most sunshine is October (Average sunshine: 10h and 12min).
The month with the least sunshine is June (Average sunshine: 6h and 18min).
Average sunshine days in September
Hell-Bourg, Reunion
- Average sunshine days in September: 4.3 days
The month with the most sunshine days is October (5.5 days).
The month with the least sunshine days is February (0.3 days).
Average UV index in September
Hell-Bourg, Reunion
- Average UV index in September: 5
The months with the highest UV index are January, February, March, April, May, November and December (UV index 6).
The months with the lowest UV index are June, July, August, September and October (UV index 5).
Average cloud cover in September
Hell-Bourg, Reunion
- Average cloud cover in September: 33
The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in September
Hell-Bourg, Reunion
- Average visibility in September: 10km
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (10km).
The month with the lowest visibility is January (9km).
