McLeansboro, IL Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for McLeansboro, a city in Hamilton County, Illinois.
This Afternoon
99°F
Slight Chance Showers And Thunderstorms
A slight chance of rain showers between 3pm and 4pm, then a slight chance of showers and thunderstorms. Sunny. High near 99, with temperatures falling to around 96 in the afternoon. Southwest wind around 6 mph. Chance of precipitation is 20%.
7-day forecast for McLeansboro
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 99°F | Slight Chance Showers And Thunderstorms | 6 mph SW | 21% |
| Tonight | 71°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 1 to 5 mph SE | 24% |
| Saturday | 98°F | Sunny | 2 to 8 mph SW | 6% |
| Saturday Night | 73°F | Partly Cloudy | 5 mph SSW | 4% |
| Sunday | 97°F | Mostly Sunny | 3 to 9 mph W | 13% |
| Sunday Night | 69°F | Mostly Cloudy then Slight Chance Rain Showers | 6 mph NNE | 24% |
| Monday | 87°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 12 mph NNE | 49% |
| Monday Night | 62°F | Chance Showers And Thunderstorms | 7 to 14 mph NNE | 49% |
| Tuesday | 76°F | Chance Showers And Thunderstorms | 8 to 14 mph N | 36% |
| Tuesday Night | 57°F | Mostly Cloudy | 5 to 14 mph N | 7% |
| Wednesday | 76°F | Mostly Sunny | 6 to 12 mph N | 3% |
| Wednesday Night | 56°F | Partly Cloudy | 3 to 10 mph NNE | 2% |
| Thursday | 77°F | Mostly Sunny | 3 to 10 mph N | 3% |
| Thursday Night | 58°F | Partly Cloudy | 3 to 9 mph NNE | 3% |
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 Sep 18, 2026.