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
63°F
Cloudy then Isolated Rain Showers
Isolated rain showers after 3pm. Cloudy. High near 63, with temperatures falling to around 54 in the afternoon. Southwest wind 10 to 15 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Oconomowoc Lake
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 63°F | Cloudy then Isolated Rain Showers | 10 to 15 mph SW | 14% |
| Tonight | 45°F | Chance Rain Showers | 10 to 15 mph SW | 39% |
| Thursday | 54°F | Rain Showers Likely then Chance Light Rain | 10 to 15 mph W | 60% |
| Thursday Night | 37°F | Chance Light Rain then Mostly Cloudy | 10 mph N | 27% |
| Friday | 48°F | Mostly Cloudy | 5 to 15 mph N | 8% |
| Friday Night | 30°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Saturday | 50°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 0 to 5 mph W | 3% |
| Sunday | 55°F | Sunny | 5 to 10 mph W | 7% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 1% |
| Monday | 59°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Monday Night | 39°F | Mostly Clear | 5 to 10 mph W | 1% |
| Tuesday | 59°F | Sunny | 5 to 10 mph NW | 2% |
| Tuesday Night | 37°F | Partly Cloudy | 0 to 5 mph NW | 1% |
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 Nov 4, 2026.