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 >

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

72°F

22°C

Humidity 97%
Wind Speed Calm
Barometer 30.05 in (1017.0 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 7 Jul 11:52 pm CDT
Extended Forecast for

5 Miles NNW Vergennes IL

Flood Advisory until July 8, 03:00am
Click here for hazard details and duration
Flood Advisory
  •  
    Flood Advisory until July 8, 03:00am

    NOW until 3:00am Wed

    Flood Advisory

  • Overnight

    Low: 68 °F

    Chance
    Showers and
    Patchy Fog

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms, mainly after 3pm.  Mostly sunny, with a high near 88. Calm wind.

    High: 88 °F

    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Thursday

    Thursday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 93. South southwest wind 3 to 7 mph.

    High: 93 °F

    Sunny then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Partly cloudy, with a low around 73. South wind around 6 mph.  Chance of precipitation is 60%.

    Low: 73 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm.  Partly sunny, with a high near 91. Southwest wind 6 to 8 mph.  Chance of precipitation is 70%.

    High: 91 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm.  Mostly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 70%.

    Low: 71 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers and thunderstorms.  Partly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms, mainly before 1am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 68. Calm wind.
Wednesday
A 30 percent chance of showers and thunderstorms, mainly after 3pm. Mostly sunny, with a high near 88. Calm wind.
Wednesday Night
Mostly clear, with a low around 69. Calm wind.
Thursday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. South southwest wind 3 to 7 mph.
Thursday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 73. South wind around 6 mph. Chance of precipitation is 60%.
Friday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 91. Southwest wind 6 to 8 mph. Chance of precipitation is 70%.
Friday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming west southwest around 5 mph.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light south southwest wind.
Sunday
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 88. Calm wind becoming north northeast around 6 mph in the morning.
Sunday Night
Partly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm in the evening.
Monday
Sunny, with a high near 89. Calm wind becoming east northeast around 5 mph in the afternoon.
Monday Night
Clear, with a low around 69. Light and variable wind.
Tuesday
Sunny, with a high near 91. Light east northeast wind.
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ABOUT THIS FORECAST

 
Point Forecast:
5 Miles NNW Vergennes IL
 37.97°N 89.36°W
12:26 am CDT Jul 8, 2026
12am CDT Jul 8, 2026-6pm CDT Jul 14, 2026
 
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Additional Resources

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Hourly Weather Forecast

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