Areas of Severe Thunderstorms, Excessive Rainfall, and Extreme Heat Wednesday

In the Upper Midwest, heavy to excessive rain may bring flash and urban flooding through Wednesday. Scattered severe thunderstorms capable of large hail and damaging wind gusts are possible from the central High Plains into the Upper Midwest Wednesday. Extreme heat is ongoing over the Desert Southwest through Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Mount Vernon Airport (KMVN)

Lat: 38.33°NLon: 88.85°WElev: 466ft.

Fair

73°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 30.02 in (1016.4 mb)
Dewpoint 72°F (22°C)
Visibility 9.00 mi
Last update 8 Jul 2:56 am CDT
Extended Forecast for

4 Miles SSE Dahlgren IL

  • Overnight

    Overnight: Patchy fog.  Otherwise, mostly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Patchy Fog

  • Wednesday

    Wednesday: A 40 percent chance of showers and thunderstorms, mainly after noon.  Patchy fog before 8am.  Otherwise, partly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Chance
    T-storms and
    Patchy Fog

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 9pm.  Mostly clear, with a low around 70. Calm wind.

    Low: 70 °F

    Slight Chance
    T-storms then
    Mostly Clear

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms, mainly after 4pm.  Sunny, with a high near 93. Southwest wind 3 to 7 mph.

    High: 93 °F

    Sunny then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm.  Mostly cloudy, with a low around 73. South wind around 6 mph.  Chance of precipitation is 70%.

    Low: 73 °F

    Showers
    Likely

  • Friday

    Friday: Showers and possibly a thunderstorm.  High near 90. West southwest wind 5 to 7 mph.  Chance of precipitation is 80%.

    High: 90 °F

    Showers
    Likely then
    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 7pm, then showers likely and possibly a thunderstorm after 7pm.  Mostly cloudy, with a low around 71. Northwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 70%.

    Low: 71 °F

    T-storms
    Likely then
    Showers
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm.  Partly sunny, with a high near 87. Light west southwest wind.

    High: 87 °F

    Chance
    T-storms then
    Showers
    Likely

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers.  Mostly cloudy, with a low around 70. Light and variable wind.

    Low: 70 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Patchy fog. Otherwise, mostly cloudy, with a low around 69. Calm wind.
Wednesday
A 40 percent chance of showers and thunderstorms, mainly after noon. Patchy fog before 8am. Otherwise, partly sunny, with a high near 87. Calm wind.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 9pm. Mostly clear, with a low around 70. Calm wind.
Thursday
A 30 percent chance of showers and thunderstorms, mainly after 4pm. Sunny, with a high near 93. Southwest wind 3 to 7 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 73. South wind around 6 mph. Chance of precipitation is 70%.
Friday
Showers and possibly a thunderstorm. High near 90. West southwest wind 5 to 7 mph. Chance of precipitation is 80%.
Friday Night
Showers and thunderstorms likely before 7pm, then showers likely and possibly a thunderstorm after 7pm. Mostly cloudy, with a low around 71. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 87. Light west southwest wind.
Saturday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Mostly cloudy, with a low around 70. Light and variable wind.
Sunday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Calm wind becoming north northeast around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 69. North northeast wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 89. Calm wind becoming northeast around 5 mph in the afternoon.
Monday Night
Clear, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 91. Calm wind becoming northeast around 5 mph in the afternoon.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSE Dahlgren IL
 38.15°N 88.67°W
1:56 am CDT Jul 8, 2026
3am CDT Jul 8, 2026-6pm CDT Jul 14, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database