McLeansboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McLeansboro, a city in Hamilton County, Illinois.
This Afternoon
79°F
Mostly Sunny
Mostly sunny. High near 79, with temperatures falling to around 76 in the afternoon. South wind around 21 mph, with gusts as high as 29 mph.
7-day forecast for McLeansboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 21 mph S | 4% |
| Tonight | 57°F | Showers And Thunderstorms | 8 to 18 mph S | 97% |
| Wednesday | 68°F | Partly Sunny | 6 to 13 mph SW | 12% |
| Wednesday Night | 45°F | Partly Cloudy | 3 mph WSW | 0% |
| Thursday | 69°F | Sunny | 3 to 10 mph SW | 0% |
| Thursday Night | 45°F | Partly Cloudy | 2 mph WNW | 5% |
| Friday | 61°F | Partly Sunny | 2 to 10 mph NNW | 3% |
| Friday Night | 40°F | Partly Cloudy | 2 to 8 mph NNW | 1% |
| Saturday | 57°F | Mostly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 1 mph NW | 1% |
| Sunday | 62°F | Sunny | 1 to 8 mph W | 6% |
| Sunday Night | 34°F | Mostly Clear | 3 mph NW | 6% |
| Monday | 65°F | Sunny | 1 to 9 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 5 mph SW | 0% |
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 Nov 3, 2026.