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

Thunderstorms and Heavy Rainfall in the Mid-Atlantic; Fire Weather Concerns in the West

Thunderstorms are expected to bring heavy rain and potential significant flash and urban flooding to the Mid-Atlantic on Thursday, especially along the I-95 urban corridor. Dry conditions, gusty winds, and isolated dry thunderstorms will continue to bring a critical fire weather threat to the northwestern Great Basin into the interior Northwest through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

A Few Clouds

78°F

26°C

Humidity 93%
Wind Speed NE 3 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 31 Jul 1:56 am CDT
Extended Forecast for

4 Miles SSE Dahlgren IL

  • Overnight

    Overnight: A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 74. Calm wind.

    Low: 74 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. North northwest wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.

    High: 83 °F

    Chance
    T-storms

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 65. North northeast wind 8 to 13 mph, with gusts as high as 20 mph.

    Low: 65 °F

    Mostly Cloudy

  • Friday

    Friday: Sunny, with a high near 82. Northeast wind 9 to 14 mph, with gusts as high as 18 mph.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. North northeast wind 6 to 10 mph.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80. Northeast wind 6 to 10 mph.

    High: 80 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61. Northeast wind 3 to 7 mph.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 83. East northeast wind 3 to 6 mph.

    High: 83 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 74. Calm wind.
Thursday
A chance of showers and thunderstorms before 10am, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. North northwest wind 6 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 30%.
Thursday Night
Mostly cloudy, with a low around 65. North northeast wind 8 to 13 mph, with gusts as high as 20 mph.
Friday
Sunny, with a high near 82. Northeast wind 9 to 14 mph, with gusts as high as 18 mph.
Friday Night
Mostly clear, with a low around 60. North northeast wind 6 to 10 mph.
Saturday
Sunny, with a high near 80. Northeast wind 6 to 10 mph.
Saturday Night
Mostly clear, with a low around 61. Northeast wind 3 to 7 mph.
Sunday
Sunny, with a high near 83. East northeast wind 3 to 6 mph.
Sunday Night
Partly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening.
Monday
A chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. Calm wind becoming southeast around 6 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 67. East southeast wind around 5 mph becoming calm in the evening.
Tuesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 85. Calm wind becoming south southeast around 6 mph in the morning.
Tuesday Night
A slight chance of showers and thunderstorms. Mostly clear, with a low around 68. East wind around 5 mph becoming calm in the evening.
Wednesday
A slight chance of showers and thunderstorms. Sunny, with a high near 89. Calm wind becoming south around 6 mph in the afternoon.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Dahlgren IL
 38.15°N 88.67°W
Last Update:
1:32 am CDT Jul 31, 2025
Forecast Valid:
2am CDT Jul 31, 2025-6pm CDT Aug 6, 2025
 
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