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

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

80°F

27°C

Humidity 51%
Wind Speed S 13 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 15 May 5:56 pm CDT
Extended Forecast for

5 Miles SW Dahlgren IL

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. South wind 9 to 13 mph, with gusts as high as 22 mph.

    Low: 67 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Saturday

    Saturday: Showers and thunderstorms likely, mainly before noon. Mostly cloudy, with a high near 85. Southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms, mainly between 10pm and midnight. Mostly cloudy, then gradually becoming clear, with a low around 65. South wind 6 to 8 mph.

    Low: 65 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 89. South wind 8 to 16 mph, with gusts as high as 22 mph.

    High: 89 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 68. South wind 11 to 13 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Mostly Clear

  • Monday

    Monday: A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Breezy, with a south wind 13 to 20 mph, with gusts as high as 26 mph.

    High: 90 °F

    Breezy.
    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind 14 to 16 mph, with gusts as high as 23 mph.

    Low: 71 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. Partly sunny, with a high near 83. South southwest wind 15 to 17 mph, with gusts as high as 24 mph.

    High: 83 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South southwest wind 5 to 9 mph becoming north northwest after midnight.

    Low: 63 °F

    Showers
    Likely

Detailed Forecast

Tonight
A 30 percent chance of showers and thunderstorms, mainly after 3am. Mostly cloudy, with a low around 67. South wind 9 to 13 mph, with gusts as high as 22 mph.
Saturday
Showers and thunderstorms likely, mainly before noon. Mostly cloudy, with a high near 85. Southwest wind 9 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers and thunderstorms, mainly between 10pm and midnight. Mostly cloudy, then gradually becoming clear, with a low around 65. South wind 6 to 8 mph.
Sunday
Sunny, with a high near 89. South wind 8 to 16 mph, with gusts as high as 22 mph.
Sunday Night
Mostly clear, with a low around 68. South wind 11 to 13 mph, with gusts as high as 20 mph.
Monday
A 50 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Breezy, with a south wind 13 to 20 mph, with gusts as high as 26 mph.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind 14 to 16 mph, with gusts as high as 23 mph.
Tuesday
Showers and possibly a thunderstorm. Partly sunny, with a high near 83. South southwest wind 15 to 17 mph, with gusts as high as 24 mph.
Tuesday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 63. South southwest wind 5 to 9 mph becoming north northwest after midnight.
Wednesday
A chance of showers and thunderstorms. Partly sunny, with a high near 73. North wind around 9 mph.
Wednesday Night
A slight chance of showers. Mostly cloudy, with a low around 55. North wind 5 to 8 mph.
Thursday
Mostly sunny, with a high near 75. Northeast wind around 9 mph.
Thursday Night
A slight chance of showers. Partly cloudy, with a low around 56. Northeast wind 3 to 6 mph.
Friday
A slight chance of showers. Mostly sunny, with a high near 80. East wind 5 to 7 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
5 Miles SW Dahlgren IL
 38.15°N 88.75°W
Last Update:
5:21 pm CDT May 15, 2026
Forecast Valid:
6pm CDT May 15, 2026-6pm CDT May 22, 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