The highest day temperature in January 2026 was 46°F. The lowest night temperature was 17°F. The average values for day and night temperatures during January were 38.0°F и 31.6°F respectivly.

The average sea surface temperature in January 2026 for Lake Geneva was 44.5°F. The maximum and minimum values were 42.0°F and 47.4°F respectively.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Lake Geneva is 3.5 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 6.4 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 January is 5.1 hours.