Winnebago, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winnebago, a village in Winnebago County, Illinois.
Overnight
61°F
Mostly Clear
Mostly clear, with a low around 61. South wind around 5 mph.
7-day forecast for Winnebago
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 61°F | Mostly Clear | 5 mph S | 0% |
| Tuesday | 84°F | Mostly Sunny | 5 to 10 mph SSW | 9% |
| Tuesday Night | 65°F | Chance Showers And Thunderstorms | 5 to 10 mph WSW | 74% |
| Wednesday | 76°F | Showers And Thunderstorms Likely | 5 mph WNW | 74% |
| Wednesday Night | 59°F | Showers And Thunderstorms Likely | 0 to 5 mph WNW | 69% |
| Thursday | 78°F | Chance Rain Showers then Mostly Sunny | 0 to 5 mph NE | 33% |
| Thursday Night | 58°F | Mostly Clear | 0 to 5 mph SE | 11% |
| Friday | 80°F | Mostly Sunny | 0 to 5 mph S | 6% |
| Friday Night | 61°F | Mostly Clear | 5 mph SSW | 6% |
| Saturday | 82°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 15% |
| Saturday Night | 67°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 22% |
| Sunday | 84°F | Slight Chance Showers And Thunderstorms | 10 to 15 mph SW | 22% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SSW | 41% |
| Monday | 83°F | Chance Showers And Thunderstorms | 5 to 10 mph SSW | 40% |
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 Aug 4, 2026.