Oconomowoc, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oconomowoc, a city in Waukesha County, Wisconsin.
Today
84°F
Partly Sunny then Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 84. Southwest wind around 10 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oconomowoc
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Partly Sunny then Slight Chance Showers And Thunderstorms | 10 mph SW | 15% |
| Tonight | 63°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 10 mph W | 90% |
| Wednesday | 75°F | Patchy Fog then Chance Showers And Thunderstorms | 5 mph W | 66% |
| Wednesday Night | 59°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 39% |
| Thursday | 79°F | Slight Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 19% |
| 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 | 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 (43.100, -88.493). Updated through the day.
Growing snapshot for Oconomowoc
Last spring frost
Apr 30
First fall frost
Oct 12
Growing season
164 days
Hardiness zone
5b
More local growing data for Oconomowoc: nearby ZIP 53066 weather · frost dates · planting calendar · Wisconsin frost dates
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Climate data from the nearest NOAA station, Oconomowoc Wwtp, Wi (1.2 mi from Oconomowoc). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.