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

Areas of Dangerous Heat and Heavy Rain with Possible Flooding into this Weekend

Hot temperatures and high humidity are forecast to continue across much of northeast Texas into the mid-Mississippi Valley into this weekend with heat advisories in effect. Heavy to excessive rainfall occurring at times through Saturday could bring areas of flooding across parts of the central Plains into the upper Midwest/Great Lakes, and Four Corners states. Read More >

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fair

83°F

28°C

Humidity 63%
Wind Speed SW 7 mph
Barometer 30.24 in (1023.4 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 17 Sep 8:53 am CDT
Extended Forecast for

Mattoon IL

  • Today

    Today: Mostly sunny and hot, with a high near 96. Heat index values as high as 101. Southwest wind around 7 mph becoming north in the morning.

    High: 96 °F

    Hot

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms, mainly between midnight and 1am. Partly cloudy, with a low around 71. Light and variable wind becoming northeast around 6 mph after midnight.

    Low: 71 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms before 9am. Mostly sunny, with a high near 90. East northeast wind around 6 mph.

    High: 90 °F

    Slight Chance
    T-storms then
    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 69. East northeast wind around 8 mph becoming south southeast after midnight.

    Low: 69 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 94. South wind around 9 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.

    High: 94 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 72. South southwest wind around 6 mph.

    Low: 72 °F

    Mostly Cloudy
    then Chance
    Showers

  • Sunday

    Sunday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 89. Northwest wind 5 to 8 mph.

    High: 89 °F

    Partly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers after 1am. Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy
    then Chance
    Showers

  • Monday

    Monday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.

    High: 82 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
Mostly sunny and hot, with a high near 96. Heat index values as high as 101. Southwest wind around 7 mph becoming north in the morning.
Tonight
A 20 percent chance of showers and thunderstorms, mainly between midnight and 1am. Partly cloudy, with a low around 71. Light and variable wind becoming northeast around 6 mph after midnight.
Friday
A 20 percent chance of showers and thunderstorms before 9am. Mostly sunny, with a high near 90. East northeast wind around 6 mph.
Friday Night
Partly cloudy, with a low around 69. East northeast wind around 8 mph becoming south southeast after midnight.
Saturday
Mostly sunny, with a high near 94. South wind around 9 mph becoming west southwest in the afternoon. Winds could gust as high as 15 mph.
Saturday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 72. South southwest wind around 6 mph.
Sunday
A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 89. Northwest wind 5 to 8 mph.
Sunday Night
A 30 percent chance of showers after 1am. Partly cloudy, with a low around 65.
Monday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.
Monday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 78.
Tuesday Night
Mostly clear, with a low around 58.
Wednesday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Mattoon IL
 39.47°N 88.36°W (Elev. 728 ft)
Last Update:
8:26 am CDT Sep 17, 2026
Forecast Valid:
8am CDT Sep 17, 2026-6pm CDT Sep 23, 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