Colby, WI Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colby, a city in Marathon County, Wisconsin.
This Afternoon
63°F
Showers And Thunderstorms
Showers and thunderstorms. Mostly cloudy. High near 63, with temperatures falling to around 58 in the afternoon. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for Colby
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 63°F | Showers And Thunderstorms | 10 mph ESE | 96% |
| Tonight | 49°F | Showers And Thunderstorms | 12 to 15 mph ESE | 95% |
| Saturday | 62°F | Showers And Thunderstorms Likely | 9 to 14 mph E | 69% |
| Saturday Night | 48°F | Chance Rain Showers then Mostly Cloudy | 6 to 9 mph NE | 53% |
| Sunday | 67°F | Partly Sunny | 9 to 13 mph NE | 3% |
| Sunday Night | 41°F | Mostly Cloudy | 8 mph ENE | 1% |
| Monday | 62°F | Mostly Cloudy | 10 mph ENE | 3% |
| Monday Night | 38°F | Mostly Cloudy | 6 mph ENE | 3% |
| Tuesday | 62°F | Mostly Sunny | 6 to 9 mph ENE | 4% |
| Tuesday Night | 39°F | Partly Cloudy | 5 mph E | 3% |
| Wednesday | 65°F | Mostly Sunny | 3 to 7 mph E | 1% |
| Wednesday Night | 42°F | Partly Cloudy | 3 mph ESE | 2% |
| Thursday | 68°F | Mostly Sunny | 3 mph SSE | 9% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph SSW | 8% |
Forecast source: National Weather Service (api.weather.gov) for Colby (44.911, -90.316). Updated through the day.
Growing snapshot for Colby
Last spring frost
May 13
First fall frost
Sep 26
Growing season
136 days
Hardiness zone
4b
More local growing data for Colby: nearby ZIP 54421 weather · frost dates · planting calendar · Wisconsin frost dates
Nearby towns & communities
Abbotsford
Athens
Edgar
Eland
Elderon
Fenwood
Hatley
Knowlton
Kronenwetter
Maine
Marathon City
Mosinee
Rib Mountain
Rothschild
Schofield
Stratford
Wausau
Weston
Climate data from the nearest NOAA station, Owen 1E, Wi (13.3 mi from Colby). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.