September weather forecastSion, Netherlands
September
Weather in September
September, the first month of the autumn in Sion, is still a refreshing month, with an average temperature varying between 18.1°C (64.6°F) and 13.8°C (56.8°F).Temperature
The start of September involves a subtle temperature drop, shifting from a pleasant 21.1°C (70°F) in August to a comfortable 18.1°C (64.6°F). Sion in September experiences a minor decline in temperature, with an average low of 13.8°C (56.8°F) at night.Humidity
The average relative humidity in September in Sion is 77%.Rainfall
In Sion, in September, during 16.8 rainfall days, 51mm (2.01") of precipitation is typically accumulated. Throughout the year, there are 198.4 rainfall days, and 554mm (21.81") of precipitation is accumulated.Snowfall
May through October are months without snowfall in Sion.Daylight
The average length of the day in September is 12h and 39min.On the first day of the month, sunrise is at 06:55 and sunset at 20:29. On the last day of September, sunrise is at 07:42 and sunset at 19:22 CEST.
Sunshine
In September, the average sunshine is 7.2h.UV index
In Sion, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 4 in September translates into these instructions:
Act with care - The need to guard against sun damage is communicated. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sion, Netherlands
- Average high temperature in September: 18.1°C
The warmest month (with the highest average high temperature) is August (21.1°C).
The month with the lowest average high temperature is January (5.9°C).
- Average low temperature in September: 13.8°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (2.9°C).
Average pressure in September
Sion, Netherlands
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is September (1016.9mbar).
The month with the lowest atmospheric pressure is November (1011.2mbar).
Average wind speed in September
Sion, Netherlands
- Average wind speed in September: 17.7km/h
The windiest month (with the highest average wind speed) is December (24.9km/h).
The calmest month (with the lowest average wind speed) is July (16.2km/h).
Average humidity in September
Sion, Netherlands
- Average humidity in September: 77%
The months with the highest relative humidity are January and December (83%).
The months with the lowest relative humidity are April and August (75%).
Average rainfall in September
Sion, Netherlands
- Average rainfall in September: 51mm
The wettest month (with the highest rainfall) is August (65mm).
The driest month (with the least rainfall) is April (18mm).
Average rainfall days in September
Sion, Netherlands
- Average rainfall days in September: 16.8 days
The months with the highest number of rainy days are August and December (19.8 days).
The month with the least rainy days is April (12.3 days).
Average snowfall in September
Sion, Netherlands
- Average snowfall in September: 0mm
The month with the highest snowfall is February (24mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Sion, Netherlands
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Sion, Netherlands
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 42min).
The month with the shortest days is December (Average daylight: 7h and 48min).
- Average sunshine in September: 7h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 3h and 30min).
Average sunshine days in September
Sion, Netherlands
- Average sunshine days in September: 10 days
The month with the most sunshine days is April (15.8 days).
The month with the least sunshine days is December (7.1 days).
Average UV index in September
Sion, Netherlands
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Sion, Netherlands
- Average cloud cover in September: 44
The month with the most cloud cover is December (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 38).
Average visibility in September
Sion, Netherlands
- Average visibility in September: 10km
The months with the highest visibility are March, April, May, June, July, August, September, October and November (10km).
The months with the lowest visibility are January, February and December (9km).
