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
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| 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.