Winnebago, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winnebago, a village in Winnebago County, Illinois.
Overnight
56°F
Rain Showers Likely
Rain showers likely. Cloudy. Low around 56, with temperatures rising to around 60 overnight. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Winnebago
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 56°F | Rain Showers Likely | 15 mph S | 66% |
| Wednesday | 60°F | Slight Chance Rain Showers | 15 mph SSW | 18% |
| Wednesday Night | 45°F | Slight Chance Rain Showers | 15 mph SW | 23% |
| Thursday | 55°F | Chance Rain Showers | 10 to 15 mph W | 52% |
| Thursday Night | 38°F | Slight Chance Rain Showers then Mostly Cloudy | 10 to 15 mph NNW | 21% |
| Friday | 48°F | Partly Sunny | 10 to 15 mph N | 4% |
| Friday Night | 29°F | Partly Cloudy | 0 to 10 mph NNW | 0% |
| Saturday | 51°F | Sunny | 0 to 5 mph NW | 0% |
| Saturday Night | 32°F | Mostly Clear | 5 mph W | 1% |
| Sunday | 56°F | Sunny | 5 to 10 mph W | 5% |
| Sunday Night | 33°F | Mostly Clear | 5 mph WSW | 0% |
| Monday | 60°F | Sunny | 5 to 10 mph SW | 0% |
| Monday Night | 38°F | Mostly Clear | 5 to 10 mph W | 0% |
| Tuesday | 61°F | Sunny | 5 mph WNW | 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.