The weather in Switzerland on sunday 21 September 2025
The average max temperature in Switzerland on 21 September is normally around 19°C. For comparison: the highest daytime temperature in the past 10 years was 25°C in 2018, while the lowest was 14°C in 2016.
There’s a very slim chance of precipitation, as only 2 out of the last 10 years saw any, with an average of 10,5 mm on this day. The wind often comes from the Southwest with a maximum strength of 3 Bft.The UV index can reach 7.
20 September
Temperature on 21 September in Switzerland per year
This chart shows the average temperature on 21 September in Switzerland, measured in degrees Celsius, over the past years.
Precipitation on 21 September in Switzerland over the past years
This chart shows the total measured precipitation in millimetres on 21 September in Switzerland over the past years.
Average Weather in Switzerland by Month
Click on a month below to see detailed weather info for Switzerland. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Switzerland for all months at once
