Summit Lake, WI Weather & Growing Conditions
Overnight
48°F
Patchy Fog
Patchy fog before 3am. Mostly cloudy, with a low around 48. Northeast wind 2 to 7 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 48°F | Patchy Fog | 2 to 7 mph NE | 1% |
| Sunday | 67°F | Partly Sunny | 7 to 12 mph NE | 0% |
| Sunday Night | 40°F | Mostly Cloudy | 6 to 9 mph NE | 0% |
| Monday | 62°F | Mostly Cloudy | 8 mph ENE | 0% |
| Monday Night | 35°F | Mostly Cloudy | 6 mph ENE | 0% |
| Tuesday | 64°F | Mostly Sunny | 3 to 8 mph ENE | 2% |
| Tuesday Night | 40°F | Mostly Clear | 6 mph E | 2% |
| Wednesday | 67°F | Sunny | 3 to 7 mph E | 1% |
| Wednesday Night | 43°F | Patchy Fog | 1 to 5 mph E | 1% |
| Thursday | 69°F | Patchy Fog then Mostly Sunny | 3 mph ESE | 9% |
| Thursday Night | 46°F | Mostly Cloudy | 2 mph ESE | 9% |
| Friday | 73°F | Partly Sunny | 2 mph E | 5% |
| Friday Night | 48°F | Partly Cloudy | 1 mph ESE | 4% |
| Saturday | 73°F | Mostly Sunny | 0 to 5 mph SE | 7% |
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 Sep 20, 2026.