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 brings a slight decrease in the average high-temperature, shifting from a comfortable 19°C (66.2°F) in August to a still refreshing 14.8°C (58.6°F). An average nighttime temperature of 5.1°C (41.2°F) is observed during September.Humidity
In September, the average relative humidity in Ollon, Switzerland, is 81%.Rainfall
The month with the least rainfall is September, when the rain falls for 16.3 days and typically collects 57mm (2.24") of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 3mm (0.12") of snow. Throughout the year, there are 83.4 snowfall days, and 3139mm (123.58") of snow is accumulated.Daylight
In Ollon, 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 20:10. On the last day of September, sunrise is at 07:29 and sunset at 19:13 CEST.
Sunshine
In September, the average sunshine in Ollon is 8.7h.UV index
In Ollon, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 3 during September translates into the following guidance:
Adopt protective measures - It is advised to guard against sun damage. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Ollon?
What is the average humidity in September in Ollon?
What is the driest month in Ollon?
How many days does it rain in September in Ollon?
When does it start to snow in Ollon?
How many hours of daylight does Ollon have in September?
What time are sunrise and sunset in September in Ollon?
How many hours of sunshine does Ollon have in September?
What is the UV index intensity in September in Ollon?
Average temperature in September
Ollon, Switzerland
- Average high temperature in September: 14.8°C
The warmest month (with the highest average high temperature) is August (19°C).
The month with the lowest average high temperature is January (-0.3°C).
- Average low temperature in September: 5.1°C
The month with the highest average low temperature is August (8.2°C).
The coldest month (with the lowest average low temperature) is February (-8.4°C).
Average pressure in September
Ollon, Switzerland
- Average pressure in September: 1018.3mbar
The month with the highest atmospheric pressure is December (1021mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Ollon, Switzerland
- Average wind speed in September: 6.7km/h
The windiest month (with the highest average wind speed) is December (8.8km/h).
The calmest month (with the lowest average wind speed) is August (6.5km/h).
Average humidity in September
Ollon, Switzerland
- Average humidity in September: 81%
The months with the highest relative humidity are February and March (88%).
The months with the lowest relative humidity are July, August and October (78%).
Average rainfall in September
Ollon, Switzerland
- Average rainfall in September: 57mm
The wettest month (with the highest rainfall) is May (150mm).
The driest month (with the least rainfall) is September (57mm).
Average rainfall days in September
Ollon, Switzerland
- Average rainfall days in September: 16.3 days
The month with the highest number of rainy days is May (23 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in September
Ollon, Switzerland
- Average snowfall in September: 3mm
The month with the highest snowfall is December (671mm).
The months with the least snowfall are July and August (0mm).
Average snowfall days in September
Ollon, Switzerland
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is January (15.3 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Ollon, 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 4min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Ollon, Switzerland
- Average sunshine days in September: 10.5 days
The month with the most sunshine days is October (16.8 days).
The month with the least sunshine days is June (4.8 days).
Average UV index in September
Ollon, Switzerland
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are January and February (UV index 1).
Average cloud cover in September
Ollon, Switzerland
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are August and October (Cloud cover 33).
Average visibility in September
Ollon, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are April, May, June, July, August, September, October, November and December (8km).
The months with the lowest visibility are January, February and March (7km).
