Winchester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winchester, a city in Scott County, Illinois.
Today
88°F
Sunny
Sunny, with a high near 88. South southeast wind around 6 mph.
7-day forecast for Winchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 88°F | Sunny | 6 mph SSE | 0% |
| Tonight | 69°F | Partly Cloudy | 6 mph SSE | 1% |
| Wednesday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 6 mph S | 29% |
| Wednesday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 6 mph SSE | 77% |
| Thursday | 84°F | Showers And Thunderstorms | 5 mph S | 77% |
| Thursday Night | 65°F | Partly Cloudy | 2 mph SE | 14% |
| Friday | 86°F | Partly Sunny | 2 mph SSW | 8% |
| Friday Night | 66°F | Slight Chance Showers And Thunderstorms | 2 mph S | 24% |
| Saturday | 89°F | Slight Chance Showers And Thunderstorms then Sunny | 5 mph SSW | 24% |
| Saturday Night | 71°F | Mostly Clear | 3 to 7 mph S | 6% |
| Sunday | 91°F | Sunny | 7 to 10 mph SSW | 3% |
| Sunday Night | 72°F | Mostly Clear | 9 mph SSW | 9% |
| Monday | 92°F | Mostly Sunny | 9 mph SSW | 9% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 8 mph SSW | 24% |
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 Aug 4, 2026.