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
83°F
Showers And Thunderstorms Likely
Showers and thunderstorms likely before 8am, then showers and thunderstorms between 8am and 11am, then showers and thunderstorms likely. Cloudy. High near 83, with temperatures falling to around 81 in the afternoon. East southeast wind around 5 mph, with gusts as high as 15 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
7-day forecast for South Wilmington
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 83°F | Showers And Thunderstorms Likely | 5 mph ESE | 80% |
| Tonight | 67°F | Showers And Thunderstorms Likely | 0 to 5 mph SSW | 83% |
| Sunday | 74°F | Showers And Thunderstorms Likely | 5 to 15 mph N | 70% |
| Sunday Night | 58°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 47% |
| Monday | 67°F | Rain Showers Likely | 10 to 15 mph ENE | 56% |
| Monday Night | 53°F | Chance Rain Showers | 10 to 15 mph NE | 46% |
| Tuesday | 66°F | Slight Chance Rain Showers | 10 to 15 mph NE | 23% |
| Tuesday Night | 53°F | Slight Chance Rain Showers then Mostly Cloudy | 5 to 10 mph NE | 17% |
| Wednesday | 69°F | Mostly Sunny | 5 to 10 mph NNE | 8% |
| Wednesday Night | 54°F | Mostly Cloudy | 0 to 5 mph NNE | 1% |
| Thursday | 71°F | Partly Sunny | 5 mph NNE | 3% |
| Thursday Night | 55°F | Partly Cloudy | 0 to 5 mph NNE | 3% |
| Friday | 74°F | Mostly Sunny | 0 to 5 mph NE | 3% |
| Friday Night | 54°F | Partly Cloudy | 0 to 5 mph ENE | 3% |
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 Sep 19, 2026.