Harman US

Wilmington, IL Weather & Growing Conditions

Tonight
64°F
Mostly Cloudy then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 3am. Mostly cloudy, with a low around 64. East southeast wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 30%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Tonight 64°F Mostly Cloudy then Chance Showers And Thunderstorms 10 mph ESE 33%
Saturday 82°F Showers And Thunderstorms Likely 5 to 10 mph SE 72%
Saturday Night 67°F Showers And Thunderstorms Likely 5 mph SSW 79%
Sunday 72°F Showers And Thunderstorms 5 to 15 mph NNE 79%
Sunday Night 57°F Showers And Thunderstorms Likely 10 to 15 mph NE 71%
Monday 67°F Showers And Thunderstorms Likely 10 to 15 mph ENE 60%
Monday Night 53°F Chance Rain Showers 10 to 15 mph NE 35%
Tuesday 65°F Chance Rain Showers 10 mph NE 25%
Tuesday Night 52°F Slight Chance Rain Showers then Mostly Cloudy 5 to 10 mph NE 16%
Wednesday 68°F Partly Sunny 5 to 10 mph NNE 6%
Wednesday Night 53°F Mostly Cloudy 0 to 5 mph NNE 6%
Thursday 70°F Partly Sunny 0 to 5 mph NNE 4%
Thursday Night 54°F Mostly Cloudy 0 to 5 mph NNE 3%
Friday 72°F Mostly Sunny 0 to 5 mph NNE 4%

Forecast source: National Weather Service (api.weather.gov). Updated through the day.

Growing snapshot for Wilmington, IL

Last spring frost
Apr 16
First fall frost
Oct 26
Growing season
191 days
Hardiness zone
5b

Explore more for Wilmington, IL: full frost dates · planting calendar · Illinois frost dates

Climate data from the nearest NOAA station, Channahon Dresden Isl Dam, Il (11.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.