September weather forecastSiest, France
September
Weather in September
September, the first month of the autumn in Siest, is also a moderately hot month, with an average temperature fluctuating between 24.6°C (76.3°F) and 13.4°C (56.1°F).Temperature
September observes an average high-temperature of a still moderately hot 24.6°C (76.3°F), marking an insignificant difference from August's 27.2°C (81°F). Siest observes an average nighttime temperature of 13.4°C (56.1°F) during September.Humidity
The months with the lowest humidity in Siest are August and September, with an average relative humidity of 74%.Rainfall
In Siest, during September, the rain falls for 12.3 days and regularly aggregates up to 36mm (1.42") of precipitation. Throughout the year, there are 182.1 rainfall days, and 634mm (24.96") of precipitation is accumulated.Snowfall
In Siest, France, snow does not fall in January, April through November.Daylight
In September, the average length of the day in Siest, France, is 12h and 30min.On the first day of September, sunrise is at 07:28 and sunset at 20:39. On the last day of the month, sunrise is at 08:01 and sunset at 19:47 CEST.
Sunshine
In Siest, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Exercise caution. Those with pale skin may experience burns in less than half an hour. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Siest, France
- Average high temperature in September: 24.6°C
The warmest month (with the highest average high temperature) is August (27.2°C).
The month with the lowest average high temperature is January (10.7°C).
- Average low temperature in September: 13.4°C
The month with the highest average low temperature is August (15.6°C).
The coldest month (with the lowest average low temperature) is February (4.3°C).
Average pressure in September
Siest, France
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021.6mbar).
The month with the lowest atmospheric pressure is April (1015.6mbar).
Average wind speed in September
Siest, France
- Average wind speed in September: 7.5km/h
The windiest months (with the highest average wind speed) are January and February (9.7km/h).
The calmest month (with the lowest average wind speed) is September (7.5km/h).
Average humidity in September
Siest, France
- Average humidity in September: 74%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are August and September (74%).
Average rainfall in September
Siest, France
- Average rainfall in September: 36mm
The wettest month (with the highest rainfall) is November (90mm).
The driest month (with the least rainfall) is August (31mm).
Average rainfall days in September
Siest, France
- Average rainfall days in September: 12.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is September (12.3 days).
Average snowfall in September
Siest, France
- Average snowfall in September: 0mm
The month with the highest snowfall is February (4mm).
The months with the least snowfall are January, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Siest, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.8 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Siest, France
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 42min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is November (Average sunshine: 5h and 6min).
Average sunshine days in September
Siest, France
- Average sunshine days in September: 14.9 days
The month with the most sunshine days is October (16.8 days).
The month with the least sunshine days is May (10.2 days).
Average UV index in September
Siest, France
- Average UV index in September: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 3).
Average cloud cover in September
Siest, France
- Average cloud cover in September: 29
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in September
Siest, France
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
