National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that 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

71°F

22°C

Humidity 100%
Wind Speed N 5 mph
Barometer 29.92 in (1012.6 mb)
Dewpoint 71°F (22°C)
Visibility 8.00 mi
Last update 20 Aug 4:53 am CDT
Extended Forecast for

2 Miles SSW Dupo IL

  • Today

    Today: Partly sunny, with a high near 83. Calm wind becoming north 5 to 7 mph in the morning.

    High: 83 °F

    Partly Sunny

  • Tonight

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

    Low: 67 °F

    Mostly Clear

  • Friday

    Friday: Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind.

    High: 87 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 86. Northwest wind 3 to 7 mph.

    High: 86 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy

  • Monday

    Monday: A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

Detailed Forecast

Today
Partly sunny, with a high near 83. Calm wind becoming north 5 to 7 mph in the morning.
Tonight
Mostly clear, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.
Friday
Patchy fog before 8am. Otherwise, sunny, with a high near 87. Calm wind.
Friday Night
Mostly clear, with a low around 69. Calm wind.
Saturday
Mostly sunny, with a high near 86. Northwest wind 3 to 7 mph.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Mostly sunny, with a high near 83.
Sunday Night
Mostly cloudy, with a low around 63.
Monday
A slight chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 82. Chance of precipitation is 20%.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 65.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 68.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles SSW Dupo IL
 38.49°N 90.21°W (Elev. 499 ft)
Last Update:
5:31 am CDT Aug 20, 2026
Forecast Valid:
5am CDT Aug 20, 2026-6pm CDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation