Summit Lake, WI Weather & Growing Conditions
Today
77°F
Chance Showers And Thunderstorms then Mostly Cloudy
A chance of showers and thunderstorms before 11am. Mostly cloudy, with a high near 77. Heat index values as high as 77. West wind 5 to 9 mph, with gusts as high as 18 mph. Chance of precipitation is 30%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 77°F | Chance Showers And Thunderstorms then Mostly Cloudy | 5 to 9 mph W | 27% |
| Tonight | 53°F | Mostly Cloudy then Patchy Fog | 1 to 6 mph NNW | 9% |
| Wednesday | 76°F | Patchy Fog then Mostly Sunny | 0 to 5 mph N | 8% |
| Wednesday Night | 50°F | Partly Cloudy | 0 to 3 mph SW | 0% |
| Thursday | 81°F | Sunny | 1 to 8 mph SW | 0% |
| Thursday Night | 56°F | Mostly Clear | 6 mph SSW | 0% |
| Friday | 82°F | Sunny then Chance Showers And Thunderstorms | 3 to 13 mph SW | 26% |
| Friday Night | 60°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 33% |
| Saturday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 3 to 8 mph SW | 22% |
| Saturday Night | 60°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 2 to 7 mph WSW | 47% |
| Sunday | 81°F | Chance Showers And Thunderstorms | 2 to 8 mph W | 45% |
| Sunday Night | 57°F | Chance Showers And Thunderstorms | 1 to 7 mph NNW | 31% |
| Monday | 79°F | Patchy Fog then Chance Showers And Thunderstorms | 2 to 6 mph WSW | 30% |
| Monday Night | 57°F | Chance Showers And Thunderstorms | 2 to 6 mph N | 30% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Summit Lake, WI
Last spring frost
May 22
First fall frost
Sep 24
Growing season
125 days
Hardiness zone
4b
Explore more for Summit Lake, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Rhinelander, Wi (16.5 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.