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June 21, 2026 Severe Storm Summary

Hazardous Weather Conditions

Current conditions at

Mattoon / Charleston, Coles County Memorial Airport (KMTO)

Lat: 39.48°NLon: 88.28°WElev: 722ft.

Fog

72°F

22°C

Humidity	100%
Wind Speed	S 6 mph
Barometer	29.90 in (1012.0 mb)
Dewpoint	72°F (22°C)
Visibility	0.25 mi
Last update	28 Jun 6:53 am CDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

4 Miles WSW Casey IL

Heat Advisory June 29, 11:00am until July 3, 12:00am

Heat Advisory June 28, 01:00pm until June 28, 07:00pm

Dense Fog Advisory June 28, 07:16am until June 28, 08:00am

Click here for hazard details and duration

Heat Advisory

...

Dense Fog Advisory June 28, 07:16am until June 28, 08:00am
NOW until 8:00am Sun
Dense Fog Advisory
Today
High: 89 °F
Areas Dense
Fog then
Mostly Sunny
Tonight
Low: 73 °F
Mostly Clear
Monday
High: 93 °F
Mostly Sunny
Monday Night
Low: 74 °F
Mostly Clear
Tuesday
High: 93 °F
Sunny
Tuesday Night
Low: 74 °F
Clear
Wednesday
High: 93 °F
Sunny
Wednesday Night
Low: 74 °F
Clear

Detailed Forecast

Today

Areas of dense fog before 9am. Otherwise, partly sunny, with a high near 89. Heat index values as high as 100. Calm wind becoming south around 6 mph in the morning.

Tonight

Mostly clear, with a low around 73. South southeast wind around 7 mph.

Monday

Mostly sunny, with a high near 93. Heat index values as high as 107. South southwest wind 6 to 11 mph, with gusts as high as 18 mph.

Monday Night

Mostly clear, with a low around 74. South southwest wind 6 to 10 mph, with gusts as high as 17 mph.

Tuesday

Sunny, with a high near 93. South southwest wind 6 to 9 mph, with gusts as high as 16 mph.

Tuesday Night

Clear, with a low around 74. South southwest wind 5 to 8 mph.

Wednesday

Sunny, with a high near 93. South southwest wind 5 to 7 mph.