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 Lambert International Airport (KSTL)

Lat: 38.75°NLon: 90.37°WElev: 604ft.

Overcast

79°F

26°C

Humidity 79%
Wind Speed SW 7 mph
Barometer 29.93 in (1012.3 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 19 Aug 3:51 pm CDT
Extended Forecast for

Wellston MO

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 82. Light southwest wind.

    High: 82 °F

    Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly before 8pm.  Patchy fog after 3am.  Otherwise, mostly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 70 °F

    Chance
    T-storms and
    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 9am.  Otherwise, partly sunny, with a high near 85. Calm wind becoming northeast around 5 mph in the afternoon.

    High: 85 °F

    Patchy Fog
    then Partly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 68 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms after 1am.  Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear
    then Slight
    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 82. Light southwest wind.
Tonight
A 30 percent chance of showers and thunderstorms, mainly before 8pm. Patchy fog after 3am. Otherwise, mostly cloudy, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 85. Calm wind becoming northeast around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 88. Light and variable wind.
Friday Night
A 20 percent chance of showers and thunderstorms after 1am. Mostly clear, with a low around 70.
Saturday
Mostly sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 68.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
A slight chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 20%.
Monday
A 20 percent chance of showers. Partly sunny, with a high near 85.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 88.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
Wellston MO
 38.64°N 90.29°W (Elev. 489 ft)
4:16 pm CDT Aug 19, 2026
4pm CDT Aug 19, 2026-6pm CDT Aug 26, 2026
 
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Additional Resources

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