The highest day temperature in July 2025 was 83°F. The lowest night temperature was 48°F. The average values for day and night temperatures during July were 73.3°F и 59.5°F respectivly.

The average sea surface temperature in July 2025 for Lake Geneva was 74.3°F. The maximum and minimum values were 71.6°F and 77.0°F respectively.

Most of the days in July are sunny but you can also expect cloudy and gloomy days.

Precipitation total in July for Lake Geneva is 3.1 in.

The average wind speed in July is 4.4 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Lake Geneva in July is 10.4 hours.