Lake Lucerne Weather in August

The climate in Lake Lucerne during August can be summarized as very hot, humid and wet.

August is in the summer in Lake Lucerne and is typically the warmest month of the year. Daytime maximum temperatures average around a steamy 32°C (89°F), whilst at night 25°C (76°F) is normal.

On average August is the 3rd wettest month of the year in Lake Lucerne with around 166mm 6.5 inches of rain making it a wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.8 hours of sunshine per day.

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 Lake Lucerne in August 2025.