McLeansboro, IL Weather & Growing Conditions
This Afternoon
79°F
Mostly Sunny
Mostly sunny. High near 79, with temperatures falling to around 76 in the afternoon. South southeast wind around 21 mph, with gusts as high as 28 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 21 mph SSE | 4% |
| Tonight | 57°F | Showers And Thunderstorms | 8 to 17 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 | 2 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 | Mostly Cloudy | 2 to 7 mph NNW | 1% |
| Saturday | 57°F | Mostly Sunny | 2 to 6 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 0 mph | 1% |
| Sunday | 62°F | Sunny | 0 to 8 mph WNW | 6% |
| Sunday Night | 35°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). Updated through the day.
Growing snapshot for McLeansboro, IL
Last spring frost
Apr 11
First fall frost
Oct 21
Growing season
190 days
Hardiness zone
6b
Explore more for McLeansboro, IL: full frost dates · planting calendar · Illinois frost dates
Climate data from the nearest NOAA station, Mcleansboro, Il (1.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.