Summit, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a village in Waukesha County, Wisconsin.
Tonight
61°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 61. East wind 10 to 15 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Showers And Thunderstorms | 10 to 15 mph E | 96% |
| Saturday | 69°F | Showers And Thunderstorms | 5 to 15 mph SE | 99% |
| Saturday Night | 59°F | Showers And Thunderstorms Likely | 5 to 10 mph E | 74% |
| Sunday | 65°F | Chance Rain Showers | 10 to 15 mph NE | 37% |
| Sunday Night | 52°F | Mostly Cloudy | 10 to 15 mph NE | 8% |
| 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 | 10 to 15 mph NE | 14% |
| Tuesday Night | 47°F | Mostly Cloudy | 5 to 10 mph NE | 9% |
| 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% |
| Friday | 69°F | Mostly Sunny | 0 to 5 mph NE | 4% |
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 Sep 19, 2026.