Winnebago, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winnebago, a village in Winnebago County, Illinois.
This Afternoon
72°F
Showers And Thunderstorms
Showers and thunderstorms. Cloudy, with a high near 72. South southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
7-day forecast for Winnebago
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 72°F | Showers And Thunderstorms | 5 mph SSE | 89% |
| Tonight | 60°F | Showers And Thunderstorms | 5 to 10 mph E | 92% |
| Sunday | 68°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 15 to 20 mph NE | 55% |
| Sunday Night | 54°F | Slight Chance Rain Showers | 15 mph NE | 22% |
| Monday | 63°F | Chance Rain Showers | 15 mph ENE | 42% |
| Monday Night | 48°F | Slight Chance Rain Showers | 10 to 15 mph NE | 19% |
| Tuesday | 61°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph NE | 15% |
| Tuesday Night | 47°F | Partly Cloudy | 5 to 15 mph NE | 8% |
| Wednesday | 65°F | Mostly Sunny | 10 to 15 mph NE | 3% |
| Wednesday Night | 48°F | Partly Cloudy | 5 to 10 mph NE | 1% |
| Thursday | 66°F | Mostly Sunny | 5 to 10 mph NE | 5% |
| Thursday Night | 50°F | Mostly Cloudy | 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 5 to 10 mph NE | 4% |
| Friday Night | 50°F | Partly Cloudy | 0 to 5 mph ENE | 2% |
Forecast source: National Weather Service (api.weather.gov) for Winnebago (42.267, -89.234). Updated through the day.
Growing snapshot for Winnebago
Last spring frost
Apr 24
First fall frost
Oct 17
Growing season
174 days
Hardiness zone
5b
More local growing data for Winnebago: nearby ZIP 61088 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Cherry Valley
Durand
Loves Park
Machesney Park
New Milford
Pecatonica
Rockford
Rockton
Roscoe
South Beloit
Westlake Village
Climate data from the nearest NOAA station, Rockford Gtr Rockford Ap, Il (10.1 mi from Winnebago). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.