Windsor, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Windsor, a village in Mercer County, Illinois.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Southwest wind 5 to 10 mph.
7-day forecast for Windsor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 5 to 10 mph SW | 2% |
| Tonight | 68°F | Chance Showers And Thunderstorms | 5 mph E | 46% |
| Wednesday | 80°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 5 mph N | 75% |
| Wednesday Night | 63°F | Showers And Thunderstorms | 5 mph N | 83% |
| Thursday | 80°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph NE | 61% |
| Thursday Night | 62°F | Partly Cloudy | 0 to 5 mph E | 13% |
| Friday | 82°F | Mostly Sunny | 0 to 5 mph S | 12% |
| Friday Night | 65°F | Mostly Clear | 5 mph S | 12% |
| Saturday | 85°F | Sunny | 5 to 10 mph S | 9% |
| Saturday Night | 71°F | Mostly Clear then Slight Chance Showers And Thunderstorms | 5 to 10 mph S | 15% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms then Sunny | 10 to 15 mph SW | 15% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 10 mph S | 31% |
| Monday | 86°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 10 to 15 mph S | 31% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 10 mph S | 33% |
Forecast source: National Weather Service (api.weather.gov) for Windsor (41.202, -90.444). Updated through the day.
Growing snapshot for Windsor
Last spring frost
Apr 22
First fall frost
Oct 19
Growing season
181 days
Hardiness zone
5b
More local growing data for Windsor: nearby ZIP 61465 weather · frost dates · planting calendar · Illinois frost dates
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Millersburg
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Preemption
Reynolds
Seaton
Sherrard
Viola
Climate data from the nearest NOAA station, Aledo, Il (13.8 mi from Windsor). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.