Oconomowoc, WI Weather & Growing Conditions
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. Southwest wind around 10 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 10 mph SW | 8% |
| Tonight | 64°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph W | 83% |
| Wednesday | 74°F | Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 78% |
| Wednesday Night | 57°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 mph | 26% |
| Thursday | 79°F | Mostly Sunny | 0 mph | 7% |
| Thursday Night | 58°F | Mostly Clear | 0 mph | 7% |
| Friday | 81°F | Sunny | 0 to 5 mph SW | 1% |
| Friday Night | 62°F | Mostly Clear | 0 to 5 mph SW | 6% |
| Saturday | 83°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 mph SW | 30% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Sunday Night | 65°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 10 mph SW | 51% |
| Monday | 82°F | Chance Rain Showers | 5 mph S | 43% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph NW | 44% |
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 Aug 4, 2026.