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
With the onset of September, the average high-temperature subtly recedes from August's warm 24.4°C (75.9°F) to an enjoyable 19.6°C (67.3°F). During September, the average low-temperature in Illnau is a chilly 8.1°C (46.6°F).Humidity
In September, the average relative humidity in Illnau is 81%.Rainfall
The month with the least rainfall is September, when the rain falls for 9.9 days and typically collects 29mm (1.14") of precipitation.Snowfall
June through September are months without snowfall in Illnau, Switzerland.Daylight
In September, the average length of the day in Illnau is 12h and 34min.On the first day of the month, sunrise is at 06:44 and sunset at 20:05. On the last day of September, in Illnau, Switzerland, sunrise is at 07:23 and sunset at 19:06 CEST.
Sunshine
In September, the average sunshine in Illnau is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. When the Sun is at its strongest around midday, find shade and limit exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Illnau in September?
What is the average humidity in September in Illnau?
What is the driest month in Illnau?
How many days does it rain in September in Illnau?
When it does not snow in Illnau?
Does it snow in Illnau in September?
What is the average length of the day in September in Illnau?
What time are sunrise and sunset in September in Illnau?
How long on average sun shines in September in Illnau?
How high is the UV index in September in Illnau?
Average temperature in September
Illnau, Switzerland
- Average high temperature in September: 19.6°C
The warmest month (with the highest average high temperature) is July (24.6°C).
The month with the lowest average high temperature is January (3.3°C).
- Average low temperature in September: 8.1°C
The months with the highest average low temperature are July and August (12.1°C).
The coldest month (with the lowest average low temperature) is January (-3.3°C).
Average pressure in September
Illnau, Switzerland
- Average pressure in September: 1018.7mbar
The month with the highest atmospheric pressure is December (1020.8mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in September
Illnau, Switzerland
- Average wind speed in September: 6.5km/h
The windiest month (with the highest average wind speed) is March (8.8km/h).
The calmest month (with the lowest average wind speed) is August (6.2km/h).
Average humidity in September
Illnau, Switzerland
- Average humidity in September: 81%
The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and July (76%).
Average rainfall in September
Illnau, Switzerland
- Average rainfall in September: 29mm
The wettest month (with the highest rainfall) is December (82mm).
The driest month (with the least rainfall) is September (29mm).
Average rainfall days in September
Illnau, Switzerland
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is May (18.4 days).
The months with the least rainy days are September and November (9.9 days).
Average snowfall in September
Illnau, Switzerland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (182mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Illnau, Switzerland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (11.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Illnau, 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 months with the most sunshine are July and August (Average sunshine: 10h and 12min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).
Average sunshine days in September
Illnau, Switzerland
- Average sunshine days in September: 19 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is February (11.1 days).
Average UV index in September
Illnau, Switzerland
- Average UV index in September: 4
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in September
Illnau, Switzerland
- Average cloud cover in September: 38
The months with the most cloud cover are January and February (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Illnau, Switzerland
- Average visibility in September: 8km
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (8km).
The months with the lowest visibility are January and February (7km).
Illnau, Switzerland
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