Lake Koshkonong, WI Weather & Growing Conditions
Today
83°F
Partly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 83. Southwest wind around 10 mph. Chance of precipitation is 20%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 17% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 92% |
| Wednesday | 75°F | Patchy Fog then Chance Showers And Thunderstorms | 5 mph NW | 68% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 40% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph N | 21% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 7% |
| Friday | 81°F | Mostly Sunny | 0 to 5 mph S | 2% |
| Friday Night | 62°F | Mostly Clear | 5 mph SW | 5% |
| Saturday | 84°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 68°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 10 mph SW | 30% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 47% |
| Monday | 83°F | Chance Rain Showers | 5 mph S | 46% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 5 mph W | 44% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Lake Koshkonong, WI
Last spring frost
Apr 28
First fall frost
Oct 13
Growing season
166 days
Hardiness zone
5b
Explore more for Lake Koshkonong, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Ft Atkinson, Wi (0.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.