Harman US

Wilmington, IL Weather & Growing Conditions

Overnight
65°F
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Cloudy, with a low around 65. Southeast wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.

7-day forecast

WhenTempForecastWindPrecip
Overnight 65°F Chance Showers And Thunderstorms 10 mph SE 38%
Saturday 81°F Showers And Thunderstorms Likely 5 mph ESE 89%
Saturday Night 66°F Showers And Thunderstorms Likely 5 mph SSW 88%
Sunday 73°F Showers And Thunderstorms Likely 5 to 15 mph NNE 68%
Sunday Night 57°F Chance Showers And Thunderstorms 10 to 15 mph NE 45%
Monday 66°F Chance Rain Showers 15 mph ENE 53%
Monday Night 52°F Chance Rain Showers then Mostly Cloudy 10 to 15 mph NE 44%
Tuesday 65°F Slight Chance Rain Showers 10 to 15 mph NE 19%
Tuesday Night 52°F Mostly Cloudy 5 to 10 mph NE 13%
Wednesday 68°F Partly Sunny 5 to 10 mph NNE 8%
Wednesday Night 53°F Mostly Cloudy 5 to 10 mph NNE 2%
Thursday 70°F Partly Sunny 5 mph NNE 3%
Thursday Night 54°F Mostly Cloudy 0 to 5 mph NE 3%
Friday 73°F Mostly Sunny 0 to 5 mph NE 3%

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.