Oconomowoc, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oconomowoc, a city in Waukesha County, Wisconsin.
This Afternoon
69°F
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a high near 69. East wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oconomowoc
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Rain Showers Likely | 10 mph E | 65% |
| Tonight | 59°F | Showers And Thunderstorms | 10 to 15 mph E | 97% |
| Saturday | 72°F | Showers And Thunderstorms | 10 to 15 mph SE | 95% |
| Saturday Night | 58°F | Showers And Thunderstorms Likely | 5 to 10 mph NE | 74% |
| Sunday | 67°F | Chance Rain Showers | 10 to 15 mph NE | 40% |
| Sunday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 21% |
| Monday | 63°F | Slight Chance Rain Showers | 10 to 15 mph NE | 15% |
| Monday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 14% |
| Tuesday | 61°F | Partly Sunny | 5 to 15 mph NE | 14% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 10 mph NE | 8% |
| Wednesday | 64°F | Partly Sunny | 5 to 10 mph NE | 8% |
| Wednesday Night | 48°F | Partly Cloudy | 0 to 5 mph NE | 4% |
| Thursday | 67°F | Partly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 49°F | Partly Cloudy | 0 to 5 mph NE | 4% |
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 Sep 19, 2026.