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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

73°F

23°C

Humidity 76%
Wind Speed N 5 mph
Barometer 30.01 in (1015.9 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 22 Aug 8:53 pm CDT
Extended Forecast for

2 Miles ESE Arnold MO

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear
    then Patchy
    Fog

  • Sunday

    Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 62. Calm wind.

    Low: 62 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 83. Light southeast wind.

    High: 83 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A 20 percent chance of showers after 1am. Partly cloudy, with a low around 65. Light southeast wind.

    Low: 65 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 64. Calm wind.
Sunday
Patchy fog before 8am. Otherwise, sunny, with a high near 84. Calm wind becoming northwest around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 62. Calm wind.
Monday
Mostly sunny, with a high near 83. Light southeast wind.
Monday Night
A 20 percent chance of showers after 1am. Partly cloudy, with a low around 65. Light southeast wind.
Tuesday
Mostly sunny, with a high near 86.
Tuesday Night
Partly cloudy, with a low around 67.
Wednesday
Partly sunny, with a high near 88.
Wednesday Night
Partly cloudy, with a low around 68.
Thursday
Sunny, with a high near 89.
Thursday Night
Mostly clear, with a low around 66.
Friday
Sunny, with a high near 87.
Friday Night
Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ESE Arnold MO
 38.4°N 90.33°W (Elev. 466 ft)
Last Update:
5:56 pm CDT Aug 22, 2026
Forecast Valid:
9pm CDT Aug 22, 2026-6pm CDT Aug 29, 2026
 
Forecast Discussion
 
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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

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation