Windsor, IL Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Windsor, a village in Mercer County, Illinois.

This Afternoon

68°F

Showers And Thunderstorms

Showers and thunderstorms. Mostly cloudy, with a high near 68. South wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

7-day forecast for Windsor

When	Temp	Forecast	Wind	Precip
This Afternoon	68°F	Showers And Thunderstorms	15 to 20 mph S	95%
Tonight	52°F	Showers And Thunderstorms	10 to 15 mph S	80%
Wednesday	56°F	Chance Rain Showers	15 mph SW	27%
Wednesday Night	45°F	Mostly Cloudy	15 mph SW	12%
Thursday	55°F	Chance Rain Showers	10 to 15 mph W	30%
Thursday Night	43°F	Chance Rain Showers then Mostly Cloudy	5 to 10 mph NW	30%
Friday	52°F	Partly Sunny	5 to 15 mph N	12%
Friday Night	35°F	Partly Cloudy	0 to 5 mph N	1%
Saturday	53°F	Mostly Sunny	0 to 5 mph W	5%
Saturday Night	36°F	Partly Cloudy	0 to 5 mph W	3%
Sunday	58°F	Sunny	5 to 10 mph W	8%
Sunday Night	37°F	Mostly Clear	5 mph W	2%
Monday	63°F	Sunny	5 to 10 mph SW	1%
Monday Night	41°F	Mostly Clear	5 to 10 mph W	0%

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

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

All Illinois locations ›

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 Nov 3, 2026.