Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

81°F

27°C

Humidity 74%
Wind Speed W 8 mph
Barometer 29.93 in
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 19 Aug 2:50 pm CDT
Extended Forecast for

4 Miles N Chesterfield IL

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms.  Cloudy, with a high near 81. Light southwest wind.

    High: 81 °F

    Chance
    T-storms

  • Tonight

    Tonight: A chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 4am.  Patchy fog after 5am.  Otherwise, mostly cloudy, with a low around 66. Calm wind.  Chance of precipitation is 40%.

    Low: 66 °F

    Chance
    Showers and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am.  Otherwise, mostly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 61. Light northeast wind.

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 86. Calm wind becoming west around 5 mph in the afternoon.

    High: 86 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Mostly clear, with a low around 63.

    Low: 63 °F

    Chance
    T-storms

  • Saturday

    Saturday: A slight chance of showers, with thunderstorms also possible after 1pm.  Mostly sunny, with a high near 85. Chance of precipitation is 20%.

    High: 85 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Cloudy, with a high near 81. Light southwest wind.
Tonight
A chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 4am. Patchy fog after 5am. Otherwise, mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 40%.
Thursday
Patchy fog before 8am. Otherwise, mostly sunny, with a high near 83. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 61. Light northeast wind.
Friday
Sunny, with a high near 86. Calm wind becoming west around 5 mph in the afternoon.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 63.
Saturday
A slight chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 85. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 61.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 61.
Monday
Mostly sunny, with a high near 83.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Tuesday
Mostly sunny, with a high near 87.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles N Chesterfield IL
 39.3°N 90.09°W (Elev. 515 ft)
1:26 pm CDT Aug 19, 2026
2pm CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

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