National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

66°F

19°C

Humidity 93%
Wind Speed Calm
Barometer 30.08 in (1018.1 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 20 Aug 11:53 pm CDT
Extended Forecast for

Lerna IL

  • Overnight

    Overnight: Patchy fog after 3am. Otherwise, clear, with a low around 60. Light north northeast wind.

    Low: 60 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 82. Light and variable wind.

    High: 82 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly before 2am. Increasing clouds, with a low around 65. Calm wind becoming west southwest around 5 mph after midnight.

    Low: 65 °F

    Partly Cloudy
    then Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 81. Northwest wind 6 to 13 mph, with gusts as high as 20 mph.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 60. Northwest wind 3 to 7 mph.

    Low: 60 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79. North northwest wind 5 to 8 mph.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 57. North wind around 6 mph becoming calm in the evening.

    Low: 57 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 78.

    High: 78 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Patchy fog after 3am. Otherwise, clear, with a low around 60. Light north northeast wind.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 82. Light and variable wind.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly before 2am. Increasing clouds, with a low around 65. Calm wind becoming west southwest around 5 mph after midnight.
Saturday
Sunny, with a high near 81. Northwest wind 6 to 13 mph, with gusts as high as 20 mph.
Saturday Night
Mostly clear, with a low around 60. Northwest wind 3 to 7 mph.
Sunday
Sunny, with a high near 79. North northwest wind 5 to 8 mph.
Sunday Night
Mostly clear, with a low around 57. North wind around 6 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 78.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Sunny, with a high near 81.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 63.
Thursday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Lerna IL
 39.42°N 88.28°W (Elev. 741 ft)
Last Update:
11:36 pm CDT Aug 20, 2026
Forecast Valid:
12am CDT Aug 21, 2026-6pm CDT Aug 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation