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
With September's onset, the weather reveals a slight temperature decrease, transitioning from a moderate 15.3°C (59.5°F) in August to a cool 10.9°C (51.6°F). The temperature in Casaccia dips to an average of 1.6°C (34.9°F) during September nights.Humidity
The average relative humidity in September is 85%.Rainfall
In Casaccia, in September, during 15.6 rainfall days, 39mm (1.54") of precipitation is typically accumulated. In Casaccia, Switzerland, during the entire year, the rain falls for 139.9 days and collects up to 641mm (25.24") of precipitation.Snowfall
Months with snowfall in Casaccia are January through June, September through December. September is the first month it typically snows in Casaccia, Switzerland. Throughout September, in the average 1.2 snowfall days, it receives 33mm (1.3") of snow. In Casaccia, during the entire year, snow falls for 97.2 days and aggregates up to 1956mm (77.01") of snow.Daylight
In Casaccia, the average length of the day in September is 12h and 33min.On the first day of September, sunrise is at 06:42 and sunset at 20:00. On the last day of the month, sunrise is at 07:19 and sunset at 19:03 CEST.
Sunshine
The average sunshine in September in Casaccia is 7.8h.UV index
The average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, the maximum UV index of 2 translates into these guidelines:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Casaccia in September?
What is the average humidity in September in Casaccia?
How much does it rain in Casaccia in September?
When does it start snowing in Casaccia?
What is the average length of the day in September in Casaccia?
When is the sunrise / sunset in September in Casaccia?
How long on average sun shines in September in Casaccia?
What is the UV index reading in September in Casaccia?
Average temperature in September
Casaccia, Switzerland
- Average high temperature in September: 10.9°C
The warmest month (with the highest average high temperature) is July (15.4°C).
The month with the lowest average high temperature is January (-4.4°C).
- Average low temperature in September: 1.6°C
The month with the highest average low temperature is August (5°C).
The coldest month (with the lowest average low temperature) is January (-13.9°C).
Average pressure in September
Casaccia, Switzerland
- Average pressure in September: 1018mbar
The month with the highest atmospheric pressure is December (1020.6mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Casaccia, Switzerland
- Average wind speed in September: 7.8km/h
The windiest months (with the highest average wind speed) are February and December (9.9km/h).
The calmest month (with the lowest average wind speed) is August (7.5km/h).
Average humidity in September
Casaccia, Switzerland
- Average humidity in September: 85%
The month with the highest relative humidity is April (94%).
The month with the lowest relative humidity is July (81%).
Average rainfall in September
Casaccia, Switzerland
- Average rainfall in September: 39mm
The wettest month (with the highest rainfall) is November (84mm).
The driest month (with the least rainfall) is January (20mm).
Average rainfall days in September
Casaccia, Switzerland
- Average rainfall days in September: 15.6 days
The month with the highest number of rainy days is July (22.6 days).
The month with the least rainy days is December (2.6 days).
Average snowfall in September
Casaccia, Switzerland
- Average snowfall in September: 33mm
The month with the highest snowfall is November (492mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Casaccia, Switzerland
- Average snowfall days in September: 1.2 days
The month with the highest number of snowfall days is March (17 days).
The month with the least snowfall days is August (0 days).
Average daylight in September /
Average sunshine in September
Casaccia, 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: 7h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is November (Average sunshine: 3h and 54min).
Average sunshine days in September
Casaccia, Switzerland
- Average sunshine days in September: 11 days
The month with the most sunshine days is December (18.8 days).
The month with the least sunshine days is July (6.2 days).
Average UV index in September
Casaccia, Switzerland
- Average UV index in September: 2
The months with the highest UV index are June, July and August (UV index 3).
The months with the lowest UV index are January, February, March, April, October and November (UV index 1).
Average cloud cover in September
Casaccia, Switzerland
- Average cloud cover in September: 54
The month with the most cloud cover is April (Cloud cover 66).
The month with the least cloud cover is July (Cloud cover 47).
Average visibility in September
Casaccia, Switzerland
- Average visibility in September: 7km
The month with the highest visibility is July (8km).
The month with the lowest visibility is April (5km).
