South Wilmington, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for South Wilmington, a village in Grundy County, Illinois.
Today
84°F
Mostly Sunny
Mostly sunny, with a high near 84. South southwest wind 5 to 10 mph.
7-day forecast for South Wilmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Mostly Sunny | 5 to 10 mph SSW | 2% |
| Tonight | 66°F | Partly Cloudy | 5 mph S | 4% |
| Wednesday | 83°F | Chance Showers And Thunderstorms | 5 mph SW | 46% |
| Wednesday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 0 to 5 mph W | 89% |
| Thursday | 81°F | Showers And Thunderstorms | 0 to 5 mph S | 78% |
| Thursday Night | 64°F | Chance Showers And Thunderstorms | 0 mph | 42% |
| Friday | 83°F | Mostly Sunny | 0 mph | 6% |
| Friday Night | 65°F | Mostly Clear | 0 mph | 10% |
| Saturday | 86°F | Mostly Sunny | 0 to 5 mph SSW | 11% |
| Saturday Night | 70°F | Mostly Clear | 0 to 5 mph SSW | 11% |
| Sunday | 88°F | Mostly Sunny | 5 to 10 mph SW | 10% |
| Sunday Night | 71°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 28% |
| Monday | 87°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 to 10 mph SSW | 28% |
| Monday Night | 70°F | Chance Showers And Thunderstorms | 5 mph WSW | 38% |
Forecast source: National Weather Service (api.weather.gov) for South Wilmington (41.174, -88.279). Updated through the day.
Growing snapshot for South Wilmington
Last spring frost
Apr 27
First fall frost
Oct 15
Growing season
170 days
Hardiness zone
5b
More local growing data for South Wilmington: nearby ZIP 60474 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Dwight, Il (8.9 mi from South Wilmington). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.