Fontana-on-Geneva Lake, WI Weather & Growing Conditions
Tonight
61°F
Chance Showers And Thunderstorms then Showers And Thunderstorms
A chance of showers and thunderstorms before 11pm, then showers and thunderstorms. Cloudy, with a low around 61. East wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph E | 93% |
| Sunday | 64°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 10 to 15 mph NE | 72% |
| Sunday Night | 54°F | Mostly Cloudy | 10 to 15 mph NE | 6% |
| Monday | 62°F | Cloudy then Chance Rain Showers | 10 to 15 mph NE | 25% |
| Monday Night | 50°F | Chance Rain Showers | 5 to 10 mph NE | 40% |
| Tuesday | 60°F | Chance Rain Showers | 5 to 15 mph NE | 40% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 10 mph NE | 11% |
| Wednesday | 63°F | Partly Sunny | 5 to 10 mph NE | 7% |
| Wednesday Night | 50°F | Mostly Cloudy | 0 to 10 mph NE | 3% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NE | 4% |
| Thursday Night | 52°F | Mostly Cloudy | 0 to 5 mph NE | 11% |
| Friday | 69°F | Partly Sunny | 0 to 5 mph NE | 8% |
| Friday Night | 51°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Saturday | 70°F | Mostly Sunny | 0 to 5 mph NE | 6% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fontana-on-Geneva Lake, WI
Last spring frost
Apr 25
First fall frost
Oct 21
Growing season
179 days
Hardiness zone
5b
Explore more for Fontana-on-Geneva Lake, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Lake Geneva Wwtp, Wi (7.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.