McLeansboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McLeansboro, a city in Hamilton County, Illinois.
Today
87°F
Sunny
Sunny, with a high near 87. East wind around 2 mph.
7-day forecast for McLeansboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Sunny | 2 mph E | 0% |
| Tonight | 63°F | Mostly Clear | 2 mph NE | 0% |
| Wednesday | 90°F | Sunny | 2 mph S | 0% |
| Wednesday Night | 68°F | Partly Cloudy | 2 mph S | 5% |
| Thursday | 90°F | Chance Showers And Thunderstorms | 1 to 6 mph SSW | 26% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms | 1 to 5 mph S | 56% |
| Friday | 89°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 1 to 5 mph SW | 56% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 2 mph SSW | 43% |
| Saturday | 90°F | Chance Showers And Thunderstorms | 1 to 5 mph SSW | 43% |
| Saturday Night | 70°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 3 mph S | 17% |
| Sunday | 92°F | Mostly Sunny | 2 to 8 mph SSW | 7% |
| Sunday Night | 72°F | Mostly Clear | 5 to 8 mph SSW | 5% |
| Monday | 94°F | Sunny | 5 to 9 mph SSW | 5% |
| Monday Night | 73°F | Partly Cloudy | 7 mph SSW | 10% |
Forecast source: National Weather Service (api.weather.gov) for McLeansboro (38.090, -88.539). Updated through the day.
Growing snapshot for McLeansboro
Last spring frost
Apr 11
First fall frost
Oct 21
Growing season
190 days
Hardiness zone
6b
More local growing data for McLeansboro: nearby ZIP 62859 weather · frost dates · planting calendar · Illinois frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Mcleansboro, Il (1.3 mi from McLeansboro). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.