Winchester, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Winchester, a city in Scott County, Illinois.
Overnight
54°F
Slight Chance Light Rain
A slight chance of rain before 3am. Mostly cloudy, with a low around 54. Southwest wind around 10 mph, with gusts as high as 21 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Winchester
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 54°F | Slight Chance Light Rain | 10 mph SW | 15% |
| Wednesday | 60°F | Patchy Drizzle | 10 to 15 mph WSW | 10% |
| Wednesday Night | 46°F | Patchy Drizzle then Mostly Cloudy | 10 mph WSW | 10% |
| Thursday | 61°F | Partly Sunny | 9 to 13 mph W | 4% |
| Thursday Night | 42°F | Mostly Cloudy | 6 mph NW | 6% |
| Friday | 55°F | Partly Sunny | 9 mph NNW | 2% |
| Friday Night | 31°F | Partly Cloudy | 0 to 6 mph N | 0% |
| Saturday | 55°F | Mostly Sunny | 0 to 3 mph NNW | 0% |
| Saturday Night | 31°F | Partly Cloudy | 1 mph WNW | 0% |
| Sunday | 60°F | Sunny | 1 to 6 mph WNW | 2% |
| Sunday Night | 33°F | Clear | 2 mph WSW | 0% |
| Monday | 65°F | Sunny | 0 to 6 mph SW | 0% |
| Monday Night | 38°F | Clear | 3 mph SW | 0% |
| Tuesday | 67°F | Sunny | 3 mph WNW | 1% |
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 Nov 4, 2026.