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
Start of September brings a slight shift in the average high-temperature, dipping a bit from August's moderately hot 24.1°C (75.4°F) to a refreshing 19.7°C (67.5°F). During September, the nighttime temperature averages of 9.4°C (48.9°F).Humidity
In Allschwil, the average relative humidity in September is 80%.Rainfall
The month with the least rainfall in Allschwil 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 the month, sunrise is at 06:49 and sunset at 20:10. On the last day of September, sunrise is at 07:28 and sunset at 19:11 CEST.
Sunshine
The average sunshine in September in Allschwil is 8.7h.UV index
The average daily maximum UV index in September in Allschwil is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, an average UV index of 4 transforms into the following instructions:
Undertake protective steps - Preventing sun damage is advised. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures in Allschwil?
What is the average humidity in September in Allschwil?
What is the driest month in Allschwil?
How many days does it rain in September in Allschwil?
When it does not snow in Allschwil?
Does it snow in Allschwil in September?
What is the average length of the day in September in Allschwil?
When is the sunrise / sunset in September in Allschwil?
How long on average sun shines in September in Allschwil?
How high is the UV index in September in Allschwil?
Average temperature in September
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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
Allschwil, 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).
Allschwil, Switzerland
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