Oconomowoc Lake, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Oconomowoc Lake, a village 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 60%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oconomowoc Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Rain Showers Likely | 10 mph E | 62% |
| Tonight | 59°F | Showers And Thunderstorms | 10 to 15 mph E | 97% |
| Saturday | 71°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 | 41% |
| Sunday Night | 52°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 22% |
| 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 | Mostly 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 | 5% |
| Thursday | 67°F | Mostly 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 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
Nearby towns & communities
Big Bend
Brookfield
Butler
Chenequa
Delafield
Dousman
Eagle
Elm Grove
Hartland
Lac La Belle
Lannon
Menomonee Falls
Merton
Mukwonago
Muskego
Nashotah
New Berlin
North Lake
North Prairie
Oconomowoc
Okauchee Lake
Pewaukee
Pewaukee
Potter Lake
Summit
Sussex
Vernon
Wales
Waukesha
Waukesha
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 Sep 19, 2026.