Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
A minor decrease in the average high-temperature is observed during September, shifting from a refreshing 19.8°C (67.6°F) in August to a still comfortable 16°C (60.8°F). Throughout September nights, Vionnaz registers an average low-temperature of 6°C (42.8°F).Humidity
In September, the average relative humidity in Vionnaz is 80%.Rainfall
September is the month with the least rainfall. Rain falls for 16.9 days and accumulates 54mm (2.13") of precipitation.Snowfall
Months with snowfall in Vionnaz are January through May, September through December. September is the first month it typically snows in Vionnaz. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, there are 31.1 snowfall days, and 561mm (22.09") of snow is accumulated.Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 06:53 and sunset at 20:11. On the last day of September, in Vionnaz, sunrise is at 07:30 and sunset at 19:14 CEST.
Sunshine
In Vionnaz, the average sunshine in September is 8.9h.UV index
In Vionnaz, Switzerland, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index of 3 during September translates into these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Vionnaz in September?
What is the average humidity in September in Vionnaz?
What is the driest month in Vionnaz?
How many days does it rain in September in Vionnaz?
When does it start to snow in Vionnaz?
What is the average length of the day in September in Vionnaz?
What time are sunrise and sunset in September in Vionnaz?
How many hours of sunshine does Vionnaz have in September?
How high is the UV index in September in Vionnaz?
Average temperature in September
Vionnaz, Switzerland
- Average high temperature in September: 16°C
The warmest months (with the highest average high temperature) are July and August (19.8°C).
The month with the lowest average high temperature is January (0.6°C).
- Average low temperature in September: 6°C
The month with the highest average low temperature is July (9.3°C).
The coldest month (with the lowest average low temperature) is February (-7.1°C).
Average pressure in September
Vionnaz, Switzerland
- Average pressure in September: 1018.4mbar
The month with the highest atmospheric pressure is December (1021.1mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Vionnaz, Switzerland
- Average wind speed in September: 6.9km/h
The windiest month (with the highest average wind speed) is December (9.2km/h).
The calmest month (with the lowest average wind speed) is August (6.5km/h).
Average humidity in September
Vionnaz, Switzerland
- Average humidity in September: 80%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (77%).
Average rainfall in September
Vionnaz, Switzerland
- Average rainfall in September: 54mm
The wettest month (with the highest rainfall) is May (144mm).
The driest month (with the least rainfall) is September (54mm).
Average rainfall days in September
Vionnaz, Switzerland
- Average rainfall days in September: 16.9 days
The month with the highest number of rainy days is May (23.5 days).
The month with the least rainy days is October (13.3 days).
Average snowfall in September
Vionnaz, Switzerland
- Average snowfall in September: 1mm
The month with the highest snowfall is January (148mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Vionnaz, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (8.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Vionnaz, Switzerland
- Average daylight in September: 12h and 3min
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 5min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The months with the least sunshine are January and December (Average sunshine: 5h and 30min).
Average sunshine days in September
Vionnaz, Switzerland
- Average sunshine days in September: 9.6 days
The month with the most sunshine days is October (15 days).
The month with the least sunshine days is May (4.3 days).
Average UV index in September
Vionnaz, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Vionnaz, Switzerland
- Average cloud cover in September: 33
The months with the most cloud cover are January, February, March, May and December (Cloud cover 42).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Vionnaz, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are October and November (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September and December (8km).
Vionnaz, Switzerland
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