Willisau Weather & Climate: Best Time to Visit

In Willisau, temperatures differ significantly between summer and winter months. Average maximum daytime temperatures range from a comfortable 24°C (75°F) in July, the warmest time of the year, to a chilly 4°C (39°F) during cooler months like January.

At night, you can expect temperatures ranging from 13°C (55°F) in July to around -2°C (28°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Willisau experiences significant rain/snowfall throughout the year, averaging 1588 mm (63 in) of precipitation annually. While rainfall varies throughout the year, each season offers its own charm. July brings wetter days averaging 179 mm (7 in) of precipitation, spread over 16 rainy days.

In contrast, the driest month January experiences a drier climate, with about 100 mm (3.9 in) of snow/rainfall spread across 15 snowy/rainy days. For more details, please visit our Willisau Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Willisau. While July receives considerable daily sunshine with up to 8.1 hours, December marks the darkest time of the year, where sunshine is scarce with only 1.8 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Willisau.

The city experiences its highest humidity in October, reaching 85%. In April, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year