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.

Partly Cloudy

77°F

25°C

Humidity 77%
Wind Speed E 5 mph
Barometer 29.95 in (1012.9 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 18 Aug 10:51 pm CDT
Extended Forecast for

Wellston MO

  • Tonight

    Tonight: Showers and thunderstorms, mainly after 3am.  Low around 72. Light and variable wind.  Chance of precipitation is 80%.

    Low: 72 °F

    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms, mainly before 8am.  High near 82. West wind around 5 mph becoming light and variable  in the morning.  Chance of precipitation is 80%.

    High: 82 °F

    T-storms then
    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm.  Mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 69 °F

    Chance
    T-storms then
    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Northeast wind 3 to 5 mph.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 67. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 1am.  Mostly clear, with a low around 69.

    Low: 69 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 87.

    High: 87 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

Detailed Forecast

Tonight
Showers and thunderstorms, mainly after 3am. Low around 72. Light and variable wind. Chance of precipitation is 80%.
Wednesday
Showers and thunderstorms, mainly before 8am. High near 82. West wind around 5 mph becoming light and variable in the morning. Chance of precipitation is 80%.
Wednesday Night
A 30 percent chance of showers and thunderstorms, mainly before 10pm. Mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 84. Northeast wind 3 to 5 mph.
Thursday Night
Mostly clear, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 87.
Friday Night
A 20 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 69.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 87.
Saturday Night
Mostly clear, with a low around 67.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 87.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Tuesday
Mostly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Wellston MO
 38.64°N 90.29°W (Elev. 489 ft)
10:26 pm CDT Aug 18, 2026
11pm CDT Aug 18, 2026-6pm CDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database