Thunderstorms from the Plains into the Central Appalachians; Heavy Rain in the Central Gulf Coast; Heat Across Portions of the East

Widespread showers and thunderstorms are likely from from northeast New Mexico/Southeast Colorado, eastward into the Central Plains through the Central Appalachians. Slow moving low to bring heavy rainfall to the Central Gulf Coast into the weekend. Dangerous heat is expected from the Lower Mississippi Valley, Tennessee Valley, Ohio Valley into the Mid-Atlantic and Northeast. Read More >

Hazardous Weather Conditions

Current conditions at

Southern Illinois Airport (KMDH)

Lat: 37.78°NLon: 89.25°WElev: 400ft.

Fair

79°F

26°C

Humidity 90%
Wind Speed SW 6 mph
Barometer 29.93 in (1012.9 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 16 Jul 11:52 pm CDT
Extended Forecast for

2 Miles N Saint Johns IL

  • Overnight

    Overnight: Partly cloudy, with a low around 74. Light southwest wind.

    Low: 74 °F

    Partly Cloudy

  • Thursday

    Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm.  Partly sunny, with a high near 91. Light and variable wind becoming west around 5 mph in the morning.

    High: 91 °F

    Slight Chance
    T-storms then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers and thunderstorms likely after 4am.  Mostly cloudy, with a low around 72. Light and variable wind.  Chance of precipitation is 60%.

    Low: 72 °F

    T-storms
    Likely

  • Friday

    Friday: Showers and thunderstorms likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm.  Mostly cloudy, with a high near 88. Light and variable wind becoming east southeast around 5 mph in the morning.  Chance of precipitation is 60%.

    High: 88 °F

    T-storms
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 4am, then a slight chance of showers.  Mostly cloudy, with a low around 73. South wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 60%.

    Low: 73 °F

    T-storms
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 10am.  Mostly sunny, with a high near 92. South southwest wind 5 to 8 mph.  Chance of precipitation is 30%.

    High: 92 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 75. South southwest wind around 6 mph.

    Low: 75 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A chance of showers and thunderstorms after 1pm.  Mostly sunny, with a high near 93. Southwest wind around 6 mph.

    High: 93 °F

    Mostly Sunny
    then Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, mainly before 1am.  Mostly cloudy, with a low around 75. South wind 3 to 5 mph.

    Low: 75 °F

    Chance
    T-storms

Detailed Forecast

Overnight
Partly cloudy, with a low around 74. Light southwest wind.
Thursday
A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 91. Light and variable wind becoming west around 5 mph in the morning.
Thursday Night
A chance of showers and thunderstorms before 1am, then showers likely and possibly a thunderstorm between 1am and 4am, then showers and thunderstorms likely after 4am. Mostly cloudy, with a low around 72. Light and variable wind. Chance of precipitation is 60%.
Friday
Showers and thunderstorms likely before 1pm, then showers likely and possibly a thunderstorm between 1pm and 4pm, then showers and thunderstorms likely after 4pm. Mostly cloudy, with a high near 88. Light and variable wind becoming east southeast around 5 mph in the morning. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely before 4am, then a slight chance of showers. Mostly cloudy, with a low around 73. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 92. South southwest wind 5 to 8 mph. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 75. South southwest wind around 6 mph.
Sunday
A chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Southwest wind around 6 mph.
Sunday Night
A chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 75. South wind 3 to 5 mph.
Monday
A chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 95. South southwest wind 5 to 8 mph.
Monday Night
Partly cloudy, with a low around 76. South wind 5 to 7 mph.
Tuesday
Sunny, with a high near 96. Southwest wind 6 to 8 mph.
Tuesday Night
Mostly clear, with a low around 76. South wind 5 to 7 mph.
Wednesday
Sunny and hot, with a high near 97. South southwest wind 5 to 7 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles N Saint Johns IL
 38.06°N 89.24°W
11:48 pm CDT Jul 16, 2025
12am CDT Jul 17, 2025-6pm CDT Jul 23, 2025
 
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Additional Resources

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Hourly Weather Forecast

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