Oconomowoc, WI Weather & Growing Conditions
This Afternoon
70°F
Light Rain Likely
Rain likely and a slight chance of thunderstorms. Cloudy, with a high near 70. South wind around 15 mph, with gusts as high as 35 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Light Rain Likely | 15 mph S | 63% |
| Tonight | 58°F | Light Rain | 10 to 15 mph S | 95% |
| Wednesday | 62°F | Light Rain | 10 to 15 mph S | 86% |
| Wednesday Night | 46°F | Light Rain Likely | 10 mph SW | 57% |
| Thursday | 54°F | Light Rain | 5 to 10 mph W | 75% |
| Thursday Night | 39°F | Chance Light Rain | 5 to 10 mph NW | 52% |
| Friday | 49°F | Slight Chance Light Rain then Partly Sunny | 5 to 15 mph N | 21% |
| Friday Night | 32°F | Partly Cloudy | 0 to 5 mph N | 3% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph W | 8% |
| Sunday | 57°F | Slight Chance Light Rain | 5 to 10 mph W | 18% |
| Sunday Night | 34°F | Partly Cloudy | 0 to 5 mph W | 5% |
| Monday | 59°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 38°F | Partly Cloudy | 5 to 10 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Oconomowoc, WI
Last spring frost
Apr 30
First fall frost
Oct 12
Growing season
164 days
Hardiness zone
5b
Explore more for Oconomowoc, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Oconomowoc Wwtp, Wi (1.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.