Winnebago, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winnebago, a village in Winnebago County, Illinois.
This Afternoon
67°F
Rain Showers
Rain showers. Cloudy. High near 67, with temperatures falling to around 64 in the afternoon. South southeast wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 90%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Winnebago
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 67°F | Rain Showers | 15 mph SSE | 85% |
| Tonight | 56°F | Rain Showers | 15 mph S | 85% |
| Wednesday | 59°F | Chance Rain Showers | 15 mph SSW | 41% |
| Wednesday Night | 45°F | Chance Rain Showers | 15 mph SW | 29% |
| Thursday | 54°F | Chance Rain Showers | 10 to 15 mph WSW | 53% |
| Thursday Night | 40°F | Chance Rain Showers | 10 to 15 mph NW | 30% |
| Friday | 50°F | Slight Chance Rain Showers then Partly Sunny | 10 to 15 mph N | 15% |
| Friday Night | 32°F | Partly Cloudy | 0 to 10 mph NNW | 2% |
| Saturday | 51°F | Mostly Sunny | 0 to 5 mph WNW | 2% |
| Saturday Night | 32°F | Partly Cloudy | 5 mph WSW | 3% |
| Sunday | 58°F | Mostly Sunny then Slight Chance Rain | 5 to 10 mph W | 15% |
| Sunday Night | 33°F | Mostly Clear | 5 to 10 mph W | 4% |
| Monday | 60°F | Sunny | 5 to 15 mph SW | 1% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 0% |
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 Nov 4, 2026.