September weather forecastChassieu, France
September
Weather in September
The first month of the autumn, September, is still a pleasant month in Chassieu, France, with an average temperature fluctuating between 21.5°C (70.7°F) and 11°C (51.8°F).Temperature
During the shift to September, Chassieu records a mild decrease in average high-temperature, moving from a warm 26.1°C (79°F) in August to an agreeable 21.5°C (70.7°F). Chassieu witnesses a consistent average low-temperature of 11°C (51.8°F) throughout September.Humidity
In Chassieu, the average relative humidity in September is 76%.Rainfall
September is the month with the least rainfall in Chassieu. Rain falls for 12.1 days and accumulates 41mm (1.61") of precipitation.Snowfall
April through September are months without snowfall.Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 07:01 and sunset at 20:18. On the last day of September, sunrise is at 07:37 and sunset at 19:22 CEST.
Sunshine
In Chassieu, the average sunshine in September is 8.5h.UV index
In Chassieu, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 4 during September leads to these instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chassieu, France
- Average high temperature in September: 21.5°C
The warmest month (with the highest average high temperature) is August (26.1°C).
The month with the lowest average high temperature is January (5.4°C).
- Average low temperature in September: 11°C
The months with the highest average low temperature are July and August (14.8°C).
The coldest month (with the lowest average low temperature) is January (0.2°C).
Average pressure in September
Chassieu, France
- Average pressure in September: 1018.5mbar
The month with the highest atmospheric pressure is December (1021.3mbar).
The month with the lowest atmospheric pressure is April (1015.4mbar).
Average wind speed in September
Chassieu, France
- Average wind speed in September: 8.7km/h
The windiest month (with the highest average wind speed) is February (12.1km/h).
The calmest month (with the lowest average wind speed) is August (8.5km/h).
Average humidity in September
Chassieu, France
- Average humidity in September: 76%
The month with the highest relative humidity is December (85%).
The month with the lowest relative humidity is August (70%).
Average rainfall in September
Chassieu, France
- Average rainfall in September: 41mm
The wettest month (with the highest rainfall) is November (83mm).
The driest month (with the least rainfall) is September (41mm).
Average rainfall days in September
Chassieu, France
- Average rainfall days in September: 12.1 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is September (12.1 days).
Average snowfall in September
Chassieu, France
- Average snowfall in September: 0mm
The months with the highest snowfall are January and February (40mm).
The months with the least snowfall are April, May, June, July, August and September (0mm).
Average snowfall days in September
Chassieu, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (6.1 days).
The months with the least snowfall days are April, May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Chassieu, France
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Chassieu, France
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is October (14.8 days).
The month with the least sunshine days is May (7.4 days).
Average UV index in September
Chassieu, France
- Average UV index in September: 4
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Chassieu, France
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).
Average visibility in September
Chassieu, France
- Average visibility in September: 9km
The months with the highest visibility are February, March, April, May, June, July, August and September (9km).
The months with the lowest visibility are January, October, November and December (8km).
