Summit, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a village in Waukesha County, Wisconsin.
Tonight
58°F
Light Rain
Rain. Cloudy, with a low around 58. Southeast wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 58°F | Light Rain | 5 to 10 mph SE | 84% |
| Wednesday | 60°F | Chance Light Rain then Cloudy | 10 to 15 mph S | 26% |
| Wednesday Night | 46°F | Cloudy then Slight Chance Light Rain | 15 mph SW | 21% |
| Thursday | 53°F | Chance Light Rain | 10 to 15 mph W | 53% |
| Thursday Night | 39°F | Chance Light Rain | 5 to 10 mph NW | 54% |
| Friday | 49°F | Slight Chance Light Rain then Mostly Cloudy | 10 to 15 mph N | 21% |
| Friday Night | 32°F | Mostly Cloudy | 0 to 5 mph N | 3% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph W | 3% |
| Saturday Night | 32°F | Partly Cloudy | 0 to 5 mph W | 7% |
| Sunday | 57°F | Slight Chance Light Rain | 5 to 10 mph W | 18% |
| Sunday Night | 34°F | Mostly Clear | 5 mph W | 5% |
| Monday | 59°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 38°F | Partly Cloudy | 5 to 10 mph W | 1% |
| Tuesday | 59°F | Mostly Sunny | 5 to 10 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Summit (43.046, -88.477). Updated through the day.
Growing snapshot for Summit
Last spring frost
Apr 30
First fall frost
Oct 12
Growing season
164 days
Hardiness zone
5b
More local growing data for Summit: 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 Summit). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.