Hazardous Weather Conditions
Current conditions at
Mount Vernon Airport (KMVN)
Lat: 38.33°NLon: 88.85°WElev: 466ft.
Overcast
79°F
26°C
| Humidity | 79% |
| Wind Speed | S 6 mph |
| Barometer | 30.01 in (1016.1 mb) |
| Dewpoint | 72°F (22°C) |
| Visibility | 10.00 mi |
| Heat Index | 82°F (28°C) |
| Last update | 25 Jul 1:56 pm CDT |
Extended Forecast for
3 Miles SW Dahlgren IL
Heat Advisory July 26, 11:00am until July 28, 07:00pm
This Afternoon

High: 85 °F
Mostly Sunny
Tonight
Low: 72 °F
Partly Cloudy
then Patchy
FogSunday
High: 93 °F
Patchy Fog
then Slight
Chance
T-stormsSunday Night
Low: 75 °F
Slight Chance
T-storms then
Mostly ClearMonday

High: 97 °F
Hot
Monday Night

Low: 77 °F
Mostly Clear
Tuesday

High: 94 °F
Sunny
Tuesday Night

Low: 68 °F
Partly Cloudy
Wednesday

High: 89 °F
Sunny
Detailed Forecast
This Afternoon
Mostly sunny, with a high near 85. Southwest wind 3 to 5 mph.
Tonight
Patchy fog after 2am. Otherwise, increasing clouds, with a low around 72. Calm wind.
Sunday
A 10 percent chance of showers and thunderstorms after 5pm. Patchy fog before 8am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 93. Calm wind.
Sunday Night
A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 75. Light and variable wind.
Monday
Mostly sunny and hot, with a high near 97. Light south southwest wind becoming southwest 5 to 10 mph in the morning.
Monday Night
Mostly clear, with a low around 77. South southwest wind around 9 mph.
Tuesday
Sunny, with a high near 94. North northwest wind 7 to 11 mph, with gusts as high as 18 mph.
Tuesday Night
Partly cloudy, with a low around 68. North northeast wind 5 to 9 mph.
Wednesday
Sunny, with a high near 89. North northeast wind 3 to 8 mph.
Wednesday Night
Mostly clear, with a low around 66. North wind 5 to 7 mph becoming calm in the evening.
Thursday
Sunny, with a high near 88. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 68. Light east wind.
Friday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Calm wind becoming west northwest around 6 mph in the afternoon.
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ABOUT THIS FORECAST
Point Forecast:
3 Miles SW Dahlgren IL
38.17°N 88.72°W
38.17°N 88.72°W
1:46 pm CDT Jul 25, 2026
2pm CDT Jul 25, 2026-6pm CDT Jul 31, 2026



