September weather forecastSion, France
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Sion, France, with an average temperature ranging between max 25.1°C (77.2°F) and min 12.9°C (55.2°F).Temperature
As September commences, the average high-temperature subtly reduces, transitioning from 28.5°C (83.3°F) in August to a still moderately hot 25.1°C (77.2°F). Sion registers a pronounced decline from daytime peak temperatures, averaging a cool 12.9°C (55.2°F) lows in September.Humidity
In September, the average relative humidity is 72%.Rainfall
In Sion, in September, during 11.7 rainfall days, 33mm (1.3") of precipitation is typically accumulated. Throughout the year, there are 177.5 rainfall days, and 528mm (20.79") of precipitation is accumulated.Snowfall
April through November are months without snowfall.Daylight
In September, the average length of the day in Sion is 12h and 30min.On the first day of the month, sunrise is at 07:24 and sunset at 20:35. On the last day of September, in Sion, sunrise is at 07:56 and sunset at 19:42 CEST.
Sunshine
In Sion, France, the average sunshine in September is 8.6h.UV index
In Sion, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sion, France
- Average high temperature in September: 25.1°C
The warmest month (with the highest average high temperature) is August (28.5°C).
The month with the lowest average high temperature is January (9.8°C).
- Average low temperature in September: 12.9°C
The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is February (3.3°C).
Average pressure in September
Sion, France
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021.6mbar).
The months with the lowest atmospheric pressure are April and November (1015.6mbar).
Average wind speed in September
Sion, France
- Average wind speed in September: 6.6km/h
The windiest month (with the highest average wind speed) is March (8.5km/h).
The calmest month (with the lowest average wind speed) is September (6.6km/h).
Average humidity in September
Sion, France
- Average humidity in September: 72%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (70%).
Average rainfall in September
Sion, France
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is November (71mm).
The driest month (with the least rainfall) is August (28mm).
Average rainfall days in September
Sion, France
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is October (11.5 days).
Average snowfall in September
Sion, France
- Average snowfall in September: 0mm
The month with the highest snowfall is February (4mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Sion, France
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.1 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
Sion, 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 36min
The month with the most sunshine is July (Average sunshine: 9h and 30min).
The months with the least sunshine are January and November (Average sunshine: 5h and 0min).
Average sunshine days in September
Sion, France
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is October (17.2 days).
The month with the least sunshine days is May (10.5 days).
Average UV index in September
Sion, France
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in September
Sion, France
- Average cloud cover in September: 33
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in September
Sion, France
- Average visibility in September: 8km
The months with the highest visibility are May and June (9km).
The month with the lowest visibility is January (7km).
