September weather forecastChallans, France
September
Weather in September
The first month of the autumn, September, is also an agreeable month in Challans, France, with temperature in the range of an average high of 20.7°C (69.3°F) and an average low of 15°C (59°F).Temperature
Challans measures an average high-temperature of a still agreeable 20.7°C (69.3°F) in September, nearly consistent with the preceding month. Challans observes an average nighttime low-temperature of 15°C (59°F) during the month of September.Humidity
With an average relative humidity of 73%, September is the least humid month in Challans.Rainfall
September is the month with the least rainfall. Rain falls for 10.4 days and accumulates 29mm (1.14") of precipitation.Snowfall
January through November are months without snowfall.Daylight
In September, the average length of the day in Challans, France, is 12h and 33min.On the first day of the month, sunrise is at 07:27 and sunset at 20:46. On the last day of September, sunrise is at 08:05 and sunset at 19:49 CEST.
Sunshine
In September, the average sunshine in Challans is 8.2h.UV index
May through September, with an average maximum UV index of 5, are months with the highest UV index in Challans. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 during September leads to these advisories:
Undertake precautions - Obligation exists to protect against skin and eye damage. To protect against the Sun's most potent rays, avoid direct exposure around midday. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Challans, France
- Average high temperature in September: 20.7°C
The warmest month (with the highest average high temperature) is July (22.2°C).
The months with the lowest average high temperature are January and February (9.9°C).
- Average low temperature in September: 15°C
The month with the highest average low temperature is August (16.8°C).
The coldest month (with the lowest average low temperature) is February (5.8°C).
Average pressure in September
Challans, France
- Average pressure in September: 1018.3mbar
The month with the highest atmospheric pressure is December (1019.6mbar).
The month with the lowest atmospheric pressure is November (1013.8mbar).
Average wind speed in September
Challans, France
- Average wind speed in September: 16.8km/h
The windiest month (with the highest average wind speed) is December (24.2km/h).
The calmest month (with the lowest average wind speed) is August (15.8km/h).
Average humidity in September
Challans, France
- Average humidity in September: 73%
The months with the highest relative humidity are January and December (81%).
The month with the lowest relative humidity is September (73%).
Average rainfall in September
Challans, France
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is November (83mm).
The driest month (with the least rainfall) is September (29mm).
Average rainfall days in September
Challans, France
- Average rainfall days in September: 10.4 days
The month with the highest number of rainy days is January (19.3 days).
The month with the least rainy days is September (10.4 days).
Average snowfall in September
Challans, France
- Average snowfall in September: 0mm
The month with the highest snowfall is December (1mm).
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Challans, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.3 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Challans, France
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 8h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The months with the least sunshine are January and December (Average sunshine: 4h and 36min).
Average sunshine days in September
Challans, France
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is January (9.2 days).
Average UV index in September
Challans, France
- Average UV index in September: 5
The months with the highest UV index are May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 3).
Average cloud cover in September
Challans, France
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in September
Challans, France
- 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).
