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

Record Heat for the Intermountain West and Northern Plains; Heavy Rainfall and Severe Weather Threats

Record setting heat is expected over the next several days from the Intermountain West through the northern Plains. Furthermore, fire weather concerns increase with dry and breezy conditions. Meanwhile, heavy rainfall and severe thunderstorm threats for the Ohio/Tennessee Valleys, central Appalachians and Southeast today. The threat shifts to central Gulf Coast and across central Texas this week. Read More >

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

A Few Clouds

84°F

29°C

Humidity 59%
Wind Speed NE 12 mph
Barometer 30.14 in (1020.1 mb)
Dewpoint 68°F (20°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 12 Jul 1:53 pm CDT
Extended Forecast for

Janesville IL

  • This Afternoon

    This Afternoon: Sunny, with a high near 84. Northeast wind around 11 mph, with gusts as high as 18 mph.

    High: 84 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 64. North northeast wind 6 to 8 mph, with gusts as high as 15 mph.

    Low: 64 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 85. North northeast wind 6 to 10 mph, with gusts as high as 16 mph.

    High: 85 °F

    Sunny

  • Monday Night

    Monday Night: Clear, with a low around 67. North northeast wind 3 to 6 mph.

    Low: 67 °F

    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 88. East northeast wind 3 to 6 mph.

    High: 88 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Clear, with a low around 69. Light northeast wind.

    Low: 69 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90. Calm wind.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 70.

    Low: 70 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 84. Northeast wind around 11 mph, with gusts as high as 18 mph.
Tonight
Clear, with a low around 64. North northeast wind 6 to 8 mph, with gusts as high as 15 mph.
Monday
Sunny, with a high near 85. North northeast wind 6 to 10 mph, with gusts as high as 16 mph.
Monday Night
Clear, with a low around 67. North northeast wind 3 to 6 mph.
Tuesday
Sunny, with a high near 88. East northeast wind 3 to 6 mph.
Tuesday Night
Clear, with a low around 69. Light northeast wind.
Wednesday
Sunny, with a high near 90. Calm wind.
Wednesday Night
Clear, with a low around 70.
Thursday
Sunny, with a high near 90.
Thursday Night
Mostly clear, with a low around 70.
Friday
Sunny, with a high near 89.
Friday Night
Mostly clear, with a low around 70.
Saturday
Sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Janesville IL
 39.37°N 88.25°W (Elev. 669 ft)
Last Update:
1:26 pm CDT Jul 12, 2026
Forecast Valid:
2pm CDT Jul 12, 2026-6pm CDT Jul 18, 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