Fontana-on-Geneva Lake, WI Weather & Growing Conditions
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Southwest wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 5 to 10 mph SW | 4% |
| Tonight | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 83% |
| Wednesday | 75°F | Showers And Thunderstorms | 0 to 5 mph W | 75% |
| Wednesday Night | 60°F | Showers And Thunderstorms Likely | 0 to 5 mph N | 61% |
| Thursday | 78°F | Chance Rain Showers then Partly Sunny | 0 to 5 mph NE | 35% |
| Thursday Night | 59°F | Partly Cloudy | 0 mph | 12% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 3% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph S | 6% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SW | 10% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 25% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 25% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 45% |
| Monday | 83°F | Chance Rain Showers | 5 mph S | 44% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 mph W | 45% |
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 Aug 4, 2026.