Windsor, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Windsor, a village in Mercer County, Illinois.
Tonight
68°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2am. Mostly cloudy. Low around 68, with temperatures rising to around 70 overnight. Southeast wind 10 to 15 mph. Chance of precipitation is 50%.
7-day forecast for Windsor
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 68°F | Mostly Cloudy then Chance Showers And Thunderstorms | 10 to 15 mph SE | 45% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 5 to 10 mph S | 54% |
| Saturday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 5 mph N | 78% |
| Sunday | 72°F | Showers And Thunderstorms Likely | 10 to 15 mph NE | 78% |
| Sunday Night | 58°F | Showers And Thunderstorms Likely | 15 mph NE | 65% |
| Monday | 64°F | Showers And Thunderstorms Likely | 15 to 20 mph NE | 62% |
| Monday Night | 53°F | Chance Rain Showers | 15 mph NE | 50% |
| Tuesday | 63°F | Chance Rain Showers | 15 mph NE | 40% |
| Tuesday Night | 49°F | Mostly Cloudy | 5 to 15 mph NE | 5% |
| Wednesday | 67°F | Mostly Sunny | 10 mph NE | 2% |
| Wednesday Night | 52°F | Partly Cloudy | 5 mph NE | 2% |
| Thursday | 68°F | Mostly Sunny | 5 mph NE | 4% |
| Thursday Night | 54°F | Partly Cloudy | 0 to 5 mph NE | 5% |
| Friday | 70°F | Mostly Sunny | 5 mph NE | 5% |
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
Nearby towns & communities
Aledo
Alexis
Cable
Eliza
Hamlet
Joy
Keithsburg
Matherville
Millersburg
New Boston
North Henderson
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 Sep 19, 2026.