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
The move into September indicates a slight reduction in the average high-temperature, down from August's warm 24.1°C (75.4°F) to a refreshing 19.7°C (67.5°F). Therwil's average low-temperature for the month of September records at a frosty 9.4°C (48.9°F).Humidity
In September, the average relative humidity is 80%.Rainfall
The month with the least rainfall in Therwil, Switzerland, is September, when the rain falls for 12.5 days and typically collects 33mm (1.3") of precipitation.Snowfall
April through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 34min.On the first day of September, sunrise is at 06:49 and sunset at 20:10. On the last day of the month, sunrise is at 07:28 and sunset at 19:11 CEST.
Sunshine
The average sunshine in September in Therwil is 8.7h.UV index
The average daily maximum UV index in September in Therwil, Switzerland, is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Heed the precautions - It is counselled to guard against solar damage. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Therwil?
What is the average humidity in September in Therwil?
What is the driest month in Therwil?
How much does it rain in Therwil in September?
When it does not snow in Therwil?
Does it snow in Therwil in September?
How many hours of daylight does Therwil have in September?
When is the sunrise / sunset in September in Therwil?
How many hours of sunshine does Therwil have in September?
How high is the UV index in September in Therwil?
Average temperature in September
Therwil, Switzerland
- Average high temperature in September: 19.7°C
The warmest month (with the highest average high temperature) is August (24.1°C).
The month with the lowest average high temperature is January (3.5°C).
- Average low temperature in September: 9.4°C
The month with the highest average low temperature is August (13.3°C).
The coldest month (with the lowest average low temperature) is January (-1.8°C).
Average pressure in September
Therwil, Switzerland
- Average pressure in September: 1018.6mbar
The month with the highest atmospheric pressure is December (1020.7mbar).
The months with the lowest atmospheric pressure are April and November (1015.7mbar).
Average wind speed in September
Therwil, Switzerland
- Average wind speed in September: 7.1km/h
The windiest months (with the highest average wind speed) are February and March (9.9km/h).
The calmest month (with the lowest average wind speed) is August (6.7km/h).
Average humidity in September
Therwil, Switzerland
- Average humidity in September: 80%
The month with the highest relative humidity is January (87%).
The months with the lowest relative humidity are April, July and August (77%).
Average rainfall in September
Therwil, Switzerland
- Average rainfall in September: 33mm
The wettest month (with the highest rainfall) is June (84mm).
The driest month (with the least rainfall) is September (33mm).
Average rainfall days in September
Therwil, Switzerland
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (20.3 days).
The month with the least rainy days is October (11.5 days).
Average snowfall in September
Therwil, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is December (61mm).
The months with the least snowfall are April, May, June, July, August and September (0mm).
Average snowfall days in September
Therwil, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Therwil, 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: 8h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Therwil, Switzerland
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is October (16.8 days).
The months with the least sunshine days are May and June (8.3 days).
Average UV index in September
Therwil, Switzerland
- Average UV index in September: 4
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
Therwil, Switzerland
- Average cloud cover in September: 35
The months with the most cloud cover are January and December (Cloud cover 53).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Therwil, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are March, April, May, June, July and August (9km).
The months with the lowest visibility are January, February, September, October, November and December (8km).
