Weather in Lake Geneva: August
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Average day temperature: | 74.4°F |
| Average night temperature: | 56.8°F | |
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Sea water temperature: | 69.8°F |
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Number of sunny days: | 19 days |
| Day length: | 13.4 - 14.8 hours | |
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Number of rainy days: | 5 days |
| Precipitation totals: | 3.0 in. | |
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forecast
| Lake Geneva |
temperature
| Lake Geneva |
Air temperature in August, °F
The highest day temperature during August of 2025 was 87°F. At the same time the lowest night temperature was 51°F. Daily and nightly averages during August were 74.5°F and 60.0°F.
Sea water temperature in Lake Geneva in August, °F
The average sea water temperature in August of 2025 was 72.5°F. The highest and lowest sea temperatures during the month were 75.6°F and 69.8°F.
Mostly all days in August are sunny but cloudy days are also possible.
Precipitation total in August, in.
Precipitation total value in Lake Geneva in August is 3.4 in. Other months of the year show relatively similar values.
The average wind speed value in August is 4.1 mph It makes August lest windy month of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in August is: 9.6.
Best time for vacation in Lake Geneva
Lake Geneva on a weather map
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