Summit, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Summit, a village in Waukesha County, Wisconsin.
This Afternoon
66°F
Slight Chance Showers And Thunderstorms
A slight chance of showers and thunderstorms before 3pm, then a chance of showers and thunderstorms. Cloudy, with a high near 66. East wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Summit
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 66°F | Slight Chance Showers And Thunderstorms | 5 mph E | 58% |
| Tonight | 61°F | Showers And Thunderstorms | 5 to 10 mph NE | 81% |
| Sunday | 65°F | Scattered Rain Showers then Mostly Cloudy | 10 to 15 mph NE | 52% |
| Sunday Night | 54°F | Mostly Cloudy | 10 to 15 mph NE | 5% |
| Monday | 62°F | Mostly Cloudy | 10 to 15 mph NE | 9% |
| Monday Night | 48°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph NE | 20% |
| Tuesday | 61°F | Slight Chance Rain Showers | 5 to 15 mph NE | 20% |
| Tuesday Night | 48°F | Mostly Cloudy | 5 to 10 mph NE | 7% |
| Wednesday | 63°F | Partly Sunny | 5 to 10 mph NE | 6% |
| Wednesday Night | 49°F | Mostly Cloudy | 0 to 5 mph NE | 3% |
| Thursday | 66°F | Partly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 51°F | Mostly Cloudy | 0 to 5 mph NE | 7% |
| Friday | 70°F | Partly Sunny | 0 to 5 mph NE | 4% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph NE | 3% |
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
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
Oconomowoc Lake
Okauchee Lake
Pewaukee
Pewaukee
Potter Lake
Sussex
Vernon
Wales
Waukesha
Waukesha
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.