Hazardous Weather Conditions
Current conditions at
Mount Vernon Airport (KMVN)
Lat: 38.33°NLon: 88.85°WElev: 466ft.
Fair
78°F
26°C
| Humidity | 93% |
| Wind Speed | SW 5 mph |
| Barometer | 29.92 in (1012.9 mb) |
| Dewpoint | 76°F (24°C) |
| Visibility | 10.00 mi |
| Heat Index | 81°F (27°C) |
| Last update | 12 Aug 12:56 am CDT |
Extended Forecast for
Mount Vernon IL
Heat Advisory August 12, 01:08am until August 14, 07:00pm
NOW until 7:00pm Fri
Heat Advisory
Overnight
Low: 76 °F
Partly Cloudy
Wednesday
High: 96 °F
Mostly Sunny
then Chance
T-stormsWednesday Night
Low: 76 °F
Chance
T-stormsThursday
High: 97 °F
Slight Chance
T-storms then
Mostly SunnyThursday Night
Low: 77 °F
Mostly Clear
Friday
High: 98 °F
Hot
Friday Night
Low: 76 °F
Mostly Clear
Saturday
High: 100 °F
Hot
Detailed Forecast
Overnight
Partly cloudy, with a low around 76. Southwest wind 3 to 6 mph.
Wednesday
A 40 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 96. Heat index values as high as 107. Southwest wind 3 to 6 mph.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly between 2am and 5am. Mostly cloudy, with a low around 76. Light and variable wind becoming southeast around 5 mph after midnight.
Thursday
A 20 percent chance of showers and thunderstorms before 8am. Partly sunny and hot, with a high near 97. Heat index values as high as 109. South southwest wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 77. South wind around 6 mph.
Friday
Mostly sunny and hot, with a high near 98. Light west wind.
Friday Night
Mostly clear, with a low around 76. Light south southeast wind.
Saturday
Sunny and hot, with a high near 100. Light and variable wind.
Saturday Night
Clear, with a low around 77. Calm wind becoming south around 5 mph after midnight.
Sunday
Sunny and hot, with a high near 99. West wind 3 to 7 mph.
Sunday Night
Mostly clear, with a low around 74. Calm wind.
Monday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Calm wind becoming north around 6 mph in the morning.
Monday Night
Partly cloudy, with a low around 68. North wind around 5 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 89. Calm wind.
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Forecast AreaABOUT THIS FORECAST
Point Forecast:
Mount Vernon IL
38.31°N 88.91°W
38.31°N 88.91°W
12:17 am CDT Aug 12, 2026
1am CDT Aug 12, 2026-6pm CDT Aug 18, 2026
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