Winchester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winchester, a city in Scott County, Illinois.
Tonight
71°F
Partly Cloudy
Partly cloudy, with a low around 71. Southeast wind around 6 mph.
7-day forecast for Winchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 71°F | Partly Cloudy | 6 mph SE | 10% |
| Saturday | 94°F | Partly Sunny | 5 to 9 mph SW | 7% |
| Saturday Night | 69°F | Partly Cloudy then Chance Showers And Thunderstorms | 6 mph SSW | 29% |
| Sunday | 86°F | Rain Showers Likely | 1 to 7 mph NW | 69% |
| Sunday Night | 61°F | Showers And Thunderstorms Likely | 6 to 10 mph NE | 69% |
| Monday | 72°F | Showers And Thunderstorms Likely | 7 to 10 mph NE | 69% |
| Monday Night | 55°F | Chance Showers And Thunderstorms | 7 to 12 mph NNE | 44% |
| Tuesday | 68°F | Chance Rain Showers then Mostly Cloudy | 10 mph NNE | 32% |
| Tuesday Night | 50°F | Mostly Cloudy | 5 to 10 mph NNE | 4% |
| Wednesday | 72°F | Mostly Sunny | 5 to 8 mph NNE | 0% |
| Wednesday Night | 52°F | Partly Cloudy | 1 to 6 mph NNE | 0% |
| Thursday | 73°F | Mostly Sunny | 2 to 6 mph NNE | 4% |
| Thursday Night | 55°F | Partly Cloudy | 5 mph NNE | 4% |
| Friday | 74°F | Mostly Sunny | 2 to 6 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Winchester (39.630, -90.456). Updated through the day.
Growing snapshot for Winchester
Last spring frost
Apr 18
First fall frost
Oct 20
Growing season
183 days
Hardiness zone
6a
More local growing data for Winchester: nearby ZIP 62694 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Winchester, Il (1.5 mi from Winchester). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.