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

Severe Thunderstorms and Critical Fire Weather Wednesday

Scattered severe thunderstorms are possible across portions of the northern High Plains Wednesday afternoon and evening. Severe wind gusts are the primary hazard. Gusty winds and low relative humidity will contribute to critical fire weather conditions across parts of the northern Great Plains and Great Basin Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

66°F

19°C

Humidity 54%
Wind Speed SW 9 mph
Barometer 29.98 in (1015.4 mb)
Dewpoint 49°F (9°C)
Visibility 10.00 mi
Last update 12 May 10:56 pm CDT
Extended Forecast for

Dahlgren IL

  • Tonight

    Tonight: Increasing clouds, with a low around 60. Southwest wind around 9 mph, with gusts as high as 18 mph.

    Low: 60 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Sunny, with a high near 74. Northwest wind 7 to 16 mph, with gusts as high as 23 mph.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 48. North northwest wind 5 to 9 mph becoming calm in the evening.

    Low: 48 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 74. Calm wind.

    High: 74 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 54. Light southeast wind becoming south southeast 5 to 10 mph in the evening.

    Low: 54 °F

    Partly Cloudy

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 84. South wind 11 to 17 mph, with gusts as high as 23 mph.

    High: 84 °F

    Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 68. South wind 9 to 11 mph, with gusts as high as 20 mph.

    Low: 68 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A chance of showers and thunderstorms. Mostly sunny, with a high near 89. South southwest wind around 10 mph.

    High: 89 °F

    Chance
    T-storms

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 5 to 7 mph.

    Low: 68 °F

    Slight Chance
    T-storms

Detailed Forecast

Tonight
Increasing clouds, with a low around 60. Southwest wind around 9 mph, with gusts as high as 18 mph.
Wednesday
Sunny, with a high near 74. Northwest wind 7 to 16 mph, with gusts as high as 23 mph.
Wednesday Night
Clear, with a low around 48. North northwest wind 5 to 9 mph becoming calm in the evening.
Thursday
Sunny, with a high near 74. Calm wind.
Thursday Night
Partly cloudy, with a low around 54. Light southeast wind becoming south southeast 5 to 10 mph in the evening.
Friday
A 50 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 84. South wind 11 to 17 mph, with gusts as high as 23 mph.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 68. South wind 9 to 11 mph, with gusts as high as 20 mph.
Saturday
A chance of showers and thunderstorms. Mostly sunny, with a high near 89. South southwest wind around 10 mph.
Saturday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 68. South wind 5 to 7 mph.
Sunday
Mostly sunny, with a high near 89. South wind 9 to 16 mph, with gusts as high as 22 mph.
Sunday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 72. South wind around 14 mph, with gusts as high as 22 mph.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 91. Breezy, with a south southwest wind 14 to 20 mph, with gusts as high as 25 mph.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. South wind 8 to 11 mph, with gusts as high as 20 mph.
Tuesday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 86. South southwest wind 9 to 11 mph, with gusts as high as 18 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dahlgren IL
 38.19°N 88.7°W
Last Update:
5:35 pm CDT May 12, 2026
Forecast Valid:
11pm CDT May 12, 2026-6pm CDT May 19, 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