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

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fog/Mist

62°F

17°C

Humidity 100%
Wind Speed NW 5 mph
Barometer 29.91 in (1012.5 mb)
Dewpoint 62°F (17°C)
Visibility 5.00 mi
Last update 3 Aug 2:53 am CDT
Extended Forecast for

Lerna IL

  • Overnight

    Overnight: Patchy dense fog. Otherwise, mostly clear, with a low around 61. North wind around 6 mph.

    Low: 61 °F

    Patchy Dense
    Fog

  • Monday

    Monday: Patchy dense fog before 10am. Otherwise, mostly sunny, with a high near 82. North northeast wind around 5 mph.

    High: 82 °F

    Patchy Dense
    Fog then
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 61. East wind 3 to 5 mph.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 83. Southeast wind around 5 mph becoming calm in the morning.

    High: 83 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 61. Light east southeast wind.

    Low: 61 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 85. Calm wind becoming south around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. Light south wind.

    Low: 66 °F

    Mostly Clear
    then Chance
    T-storms

  • Thursday

    Thursday: Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 60%.

    High: 82 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

Detailed Forecast

Overnight
Patchy dense fog. Otherwise, mostly clear, with a low around 61. North wind around 6 mph.
Monday
Patchy dense fog before 10am. Otherwise, mostly sunny, with a high near 82. North northeast wind around 5 mph.
Monday Night
Mostly clear, with a low around 61. East wind 3 to 5 mph.
Tuesday
Sunny, with a high near 83. Southeast wind around 5 mph becoming calm in the morning.
Tuesday Night
Mostly clear, with a low around 61. Light east southeast wind.
Wednesday
Sunny, with a high near 85. Calm wind becoming south around 5 mph in the afternoon.
Wednesday Night
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 66. Light south wind.
Thursday
Showers likely, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 60%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.
Friday
A 30 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 82.
Friday Night
A chance of showers. Mostly cloudy, with a low around 65.
Saturday
A chance of showers. Mostly sunny, with a high near 84.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Mostly sunny, with a high near 86.
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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:
3:06 am CDT Aug 3, 2026
Forecast Valid:
3am CDT Aug 3, 2026-6pm CDT Aug 9, 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