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

84°F

29°C

Humidity 65%
Wind Speed S 9 mph
Barometer 30.07 in (1017.6 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index89°F (32°C)
Last update 17 Aug 11:53 am CDT
Extended Forecast for

4 Miles E Lerna IL

Heat Advisory August 17, 12:24pm until August 17, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 17, 12:24pm until August 17, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • This Afternoon

    High: 90 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Partly cloudy, with a low around 74. Calm wind.

    Low: 74 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 91. Heat index values as high as 100. Light east southeast wind.

    High: 91 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 73. Calm wind.

    Low: 73 °F

    Mostly Clear

  • Tuesday

    Tuesday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. Light and variable wind becoming west southwest around 6 mph in the morning. Chance of precipitation is 30%.

    High: 91 °F

    Sunny then
    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 70. Light north northwest wind.

    Low: 70 °F

    Chance
    T-storms

  • Wednesday

    Wednesday: Partly sunny, with a high near 84. North wind 5 to 7 mph.

    High: 84 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Light and variable wind.
Tonight
Partly cloudy, with a low around 74. Calm wind.
Monday
Sunny, with a high near 91. Heat index values as high as 100. Light east southeast wind.
Monday Night
Mostly clear, with a low around 73. Calm wind.
Tuesday
A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 91. Light and variable wind becoming west southwest around 6 mph in the morning. Chance of precipitation is 30%.
Tuesday Night
A 30 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 70. Light north northwest wind.
Wednesday
Partly sunny, with a high near 84. North wind 5 to 7 mph.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Mostly clear, with a low around 65.
Friday
Sunny, with a high near 85.
Friday Night
Mostly clear, with a low around 65.
Saturday
Sunny, with a high near 86.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles E Lerna IL
 39.42°N 88.19°W (Elev. 653 ft)
Last Update:
11:40 am CDT Aug 17, 2025
Forecast Valid:
12pm CDT Aug 17, 2025-6pm CDT Aug 23, 2025
 
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