Willisau Weather in September
What's the weather like in Willisau (Lucerne) in September 2025?
The climate in Willisau during September can be summarized as mild and a little damp.
September is in the fall / autumn in Willisau and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 17°C (63°F), whilst at night 9°C (48°F) is normal.
| Daytime temperature | 17.3°C 63.1°F |
|---|---|
| Nightly temperature | 8.8°C 47.8°F |
| Average temperature | 13°C 55.4°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 95 mm 3.7 ins |
| Rainy days | 13 days |
| Sea temperature | 20.5°C 68.9°F |
| Humidity | 78% |
| Windspeed | 7.2kph 5 mph |
On average September is the 5th wettest month of the year in Willisau with around 95mm 3.7 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 13 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Willisau
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Willisau in September 2025.
Other monthly averages
Best places to visit in September
Willisau weather stats
| Hottest month: | July | 21°C 69.8°F |
|---|---|---|
| Driest month: | October | 67mm 2.6ins |
| Sunniest month: | July | 7.7hrs |
| Coldest month: | January | 1.1°C 34°F |
| Wettest month: | August | 146mm 5.7ins |
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