Portage, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Portage, a city in Columbia County, Wisconsin.
This Afternoon
69°F
Light Rain
Rain. Cloudy, with a high near 69. South wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Portage
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 69°F | Light Rain | 10 to 15 mph S | 75% |
| Tonight | 56°F | Light Rain | 10 to 15 mph S | 93% |
| Wednesday | 60°F | Light Rain Likely | 10 to 15 mph S | 72% |
| Wednesday Night | 45°F | Light Rain | 10 mph SW | 78% |
| Thursday | 54°F | Light Rain | 5 to 10 mph W | 86% |
| Thursday Night | 37°F | Chance Light Rain then Cloudy | 5 to 10 mph N | 26% |
| Friday | 48°F | Slight Chance Light Rain then Partly Sunny | 5 to 10 mph N | 16% |
| Friday Night | 30°F | Partly Cloudy | 0 mph | 2% |
| Saturday | 52°F | Mostly Sunny | 0 to 5 mph W | 1% |
| Saturday Night | 33°F | Partly Cloudy | 0 to 5 mph W | 7% |
| Sunday | 58°F | Slight Chance Light Rain | 5 to 10 mph W | 17% |
| Sunday Night | 34°F | Mostly Clear | 0 to 5 mph W | 5% |
| Monday | 60°F | Mostly Sunny | 5 to 10 mph SW | 1% |
| Monday Night | 38°F | Partly Cloudy | 5 mph W | 1% |
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
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Lake Wisconsin
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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 Nov 3, 2026.