Oconomowoc Lake, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oconomowoc Lake, a village in Waukesha County, Wisconsin.
Today
83°F
Mostly Sunny
Mostly sunny, with a high near 83. Southwest wind around 10 mph.
7-day forecast for Oconomowoc Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Mostly Sunny | 10 mph SW | 13% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 to 10 mph W | 90% |
| Wednesday | 75°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 5 mph W | 67% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 40% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 mph | 20% |
| 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 | 85°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 30% |
| Sunday Night | 66°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 to 10 mph SW | 51% |
| Monday | 83°F | Chance Rain Showers | 5 mph S | 43% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 44% |
Forecast source: National Weather Service (api.weather.gov) for Oconomowoc Lake (43.104, -88.450). Updated through the day.
Growing snapshot for Oconomowoc Lake
Last spring frost
Apr 30
First fall frost
Oct 12
Growing season
164 days
Hardiness zone
5b
More local growing data for Oconomowoc Lake: nearby ZIP 53069 weather · frost dates · planting calendar · Wisconsin frost dates
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Climate data from the nearest NOAA station, Oconomowoc Wwtp, Wi (3.7 mi from Oconomowoc Lake). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.