Portage, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portage, a city in Columbia County, Wisconsin.
Today
80°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Southwest wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Portage
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 80°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 mph SW | 36% |
| Tonight | 61°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 69% |
| Wednesday | 78°F | Areas Of Fog then Partly Sunny | 0 to 5 mph W | 31% |
| Wednesday Night | 54°F | Partly Cloudy | 0 to 5 mph SW | 5% |
| Thursday | 78°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 | 39% |
Forecast source: National Weather Service (api.weather.gov) for Portage (43.549, -89.466). Updated through the day.
Growing snapshot for Portage
Last spring frost
Apr 28
First fall frost
Oct 10
Growing season
164 days
Hardiness zone
5a
More local growing data for Portage: nearby ZIP 53901 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Arlington
Cambria
Columbus
Dekorra
Doylestown
Fall River
Friesland
Lake Wisconsin
Lodi
Pardeeville
Poynette
Randolph
Rio
Wyocena
Climate data from the nearest NOAA station, Portage Wwtp, Wi (3.1 mi from Portage). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.