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
September
Weather in September
Temperature
September marks a gentle change in average high-temperature, declining from August's agreeable 21.9°C (71.4°F) to a refreshing 17.6°C (63.7°F). The nighttime temperature, during September, averages of 7.4°C (45.3°F).Humidity
The average relative humidity in September is 79%.Rainfall
In Au, during September, the rain falls for 14.6 days and regularly aggregates up to 60mm (2.36") of precipitation. Throughout the year, there are 174 rainfall days, and 955mm (37.6") of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 1mm (0.04") of snow. Throughout the year, in Au, there are 49.1 snowfall days, and 1273mm (50.12") of snow is accumulated.Daylight
In September, the average length of the day in Au is 12h and 34min.On the first day of September, sunrise is at 06:40 and sunset at 20:01. On the last day of the month, sunrise is at 07:19 and sunset at 19:02 CEST.
Sunshine
In Au, the average sunshine in September is 9.2h.UV index
The average daily maximum UV index in September in Au is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A maximum daily UV index of 3 during September morphs into the following directions:
Put precautions into practice - Guidance to elude sunburn is provided. To guard against the harmful effects of the Sun, minimize exposure during midday. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Au?
What is the average humidity in September in Au?
How much does it rain in Au in September?
When does it start snowing in Au?
How many hours of daylight does Au have in September?
When is the sunrise / sunset in September in Au?
How many hours of sunshine does Au have in September?
How high is the UV index in September in Au?
Average temperature in September
Au, Switzerland
- Average high temperature in September: 17.6°C
The warmest month (with the highest average high temperature) is July (22.2°C).
The month with the lowest average high temperature is January (1.8°C).
- Average low temperature in September: 7.4°C
The month with the highest average low temperature is August (11.2°C).
The coldest month (with the lowest average low temperature) is February (-4.8°C).
Average pressure in September
Au, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.7mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in September
Au, Switzerland
- Average wind speed in September: 6.6km/h
The windiest month (with the highest average wind speed) is March (8.3km/h).
The calmest month (with the lowest average wind speed) is August (6.5km/h).
Average humidity in September
Au, Switzerland
- Average humidity in September: 79%
The months with the highest relative humidity are January and February (86%).
The months with the lowest relative humidity are July and August (76%).
Average rainfall in September
Au, Switzerland
- Average rainfall in September: 60mm
The wettest month (with the highest rainfall) is August (110mm).
The driest month (with the least rainfall) is April (47mm).
Average rainfall days in September
Au, Switzerland
- Average rainfall days in September: 14.6 days
The month with the highest number of rainy days is May (20.3 days).
The month with the least rainy days is February (9 days).
Average snowfall in September
Au, Switzerland
- Average snowfall in September: 1mm
The month with the highest snowfall is January (376mm).
The months with the least snowfall are June, July and August (0mm).
Average snowfall days in September
Au, Switzerland
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (11.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Au, Switzerland
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 1min
The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Au, Switzerland
- Average sunshine days in September: 13 days
The month with the most sunshine days is October (17.7 days).
The month with the least sunshine days is June (7.7 days).
Average UV index in September
Au, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Au, Switzerland
- Average cloud cover in September: 36
The months with the most cloud cover are January and February (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Au, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are April, June, July and August (9km).
The months with the lowest visibility are January and February (7km).
