Portage, WI Weather & Growing Conditions
Today
80°F
Partly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 80. Southwest wind 5 to 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Partly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 36% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 67% |
| Wednesday | 78°F | Areas Of Fog then Partly Sunny | 0 to 5 mph W | 30% |
| Wednesday Night | 54°F | Partly Cloudy | 0 to 5 mph SW | 5% |
| Thursday | 79°F | Sunny | 0 to 5 mph SE | 5% |
| Thursday Night | 57°F | Mostly Clear | 0 mph | 2% |
| Friday | 81°F | Sunny | 0 to 10 mph SW | 2% |
| Friday Night | 61°F | Mostly Clear | 5 mph SW | 7% |
| Saturday | 83°F | Mostly Sunny | 5 to 10 mph SW | 12% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 32% |
| Sunday | 84°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 32% |
| Sunday Night | 64°F | Chance Showers And Thunderstorms | 0 to 10 mph SW | 51% |
| Monday | 82°F | Chance Rain Showers | 5 mph S | 47% |
| Monday Night | 63°F | Chance Showers And Thunderstorms | 0 to 5 mph NE | 38% |
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 Aug 4, 2026.