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 Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

73°F

23°C

Humidity 90%
Wind Speed Calm
Barometer 29.96 in (1014.1 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 19 Aug 12:53 am CDT
Extended Forecast for

2 Miles SW Pontoon Beach IL

  • Overnight

    Overnight: Showers and thunderstorms, mainly after 4am.  Low around 71. Light southwest wind.  Chance of precipitation is 80%.

    Low: 71 °F

    T-storms

  • Wednesday

    Wednesday: Showers and thunderstorms, mainly before 1pm.  High near 82. Southwest wind around 5 mph becoming south in the morning.  Chance of precipitation is 80%.

    High: 82 °F

    T-storms then
    Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm.  Mostly cloudy, with a low around 68. Light north wind.

    Low: 68 °F

    Chance
    T-storms then
    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 84. Northeast wind 3 to 6 mph.

    High: 84 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 65. Northeast wind around 5 mph becoming calm  in the evening.

    Low: 65 °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.  Mostly clear, with a low around 67.

    Low: 67 °F

    Slight Chance
    T-storms

  • Saturday

    Saturday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 86.

    High: 86 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
Showers and thunderstorms, mainly after 4am. Low around 71. Light southwest wind. Chance of precipitation is 80%.
Wednesday
Showers and thunderstorms, mainly before 1pm. High near 82. Southwest wind around 5 mph becoming south 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 68. Light north wind.
Thursday
Mostly sunny, with a high near 84. Northeast wind 3 to 6 mph.
Thursday Night
Mostly clear, with a low around 65. 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. Mostly clear, with a low around 67.
Saturday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 65.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A 30 percent chance of showers. Partly cloudy, with a low around 65.
Monday
A 20 percent chance of showers. Mostly sunny, with a high near 86.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Tuesday
Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SW Pontoon Beach IL
 38.7°N 90.09°W (Elev. 404 ft)
1:21 am CDT Aug 19, 2026
1am CDT Aug 19, 2026-6pm CDT Aug 25, 2026
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database