Lake Koshkonong, WI Weather & Growing Conditions
Tonight
57°F
Light Rain
Rain. Cloudy, with a low around 57. South wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 57°F | Light Rain | 10 to 15 mph S | 95% |
| Wednesday | 61°F | Slight Chance Light Rain | 10 to 15 mph SW | 24% |
| Wednesday Night | 45°F | Cloudy then Chance Light Rain | 15 mph SW | 28% |
| Thursday | 54°F | Light Rain Likely | 10 to 15 mph W | 58% |
| Thursday Night | 36°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 30% |
| Friday | 48°F | Partly Sunny | 5 to 15 mph N | 4% |
| Friday Night | 31°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 4% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 7% |
| Sunday | 57°F | Slight Chance Light Rain | 5 to 10 mph W | 17% |
| Sunday Night | 33°F | Mostly Clear | 5 mph W | 5% |
| Monday | 60°F | Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 60°F | Sunny | 5 to 10 mph W | 1% |
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 Nov 4, 2026.