Portage, WI Weather & Growing Conditions
Overnight
55°F
Showers And Thunderstorms
Showers and thunderstorms. Some of the storms could produce heavy rain. Cloudy, with a low around 55. East wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 55°F | Showers And Thunderstorms | 10 mph E | 100% |
| Saturday | 66°F | Showers And Thunderstorms | 5 to 10 mph E | 100% |
| Saturday Night | 55°F | Showers And Thunderstorms | 5 to 10 mph NE | 82% |
| Sunday | 66°F | Scattered Rain Showers then Partly Sunny | 10 to 15 mph NE | 28% |
| Sunday Night | 47°F | Mostly Cloudy | 10 mph NE | 2% |
| Monday | 61°F | Mostly Cloudy | 10 mph NE | 4% |
| Monday Night | 43°F | Mostly Cloudy | 5 to 10 mph NE | 4% |
| Tuesday | 61°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Tuesday Night | 42°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Wednesday | 64°F | Mostly Sunny | 0 to 10 mph NE | 2% |
| Wednesday Night | 45°F | Partly Cloudy | 0 to 5 mph NE | 1% |
| Thursday | 66°F | Mostly Sunny | 0 to 5 mph NE | 3% |
| Thursday Night | 46°F | Partly Cloudy | 0 to 5 mph NE | 3% |
| Friday | 70°F | Mostly Sunny | 0 to 5 mph NE | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portage, WI
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
164 days
Hardiness zone
5a
Explore more for Portage, WI: full frost dates · planting calendar · Wisconsin frost dates
Climate data from the nearest NOAA station, Portage Wwtp, Wi (3.1 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.