Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

70°F

21°C

Humidity 94%
Wind Speed SE 6 mph
Barometer 30.05 in
Dewpoint 68°F (20°C)
Visibility 7.00 mi
Last update 4 Aug 7:50 am CDT
Extended Forecast for

3 Miles N Chesterfield IL

  • Today

    Today: Sunny, with a high near 87. Calm wind becoming south around 5 mph.

    High: 87 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 65. Light southeast wind.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 88. South wind 3 to 6 mph.

    High: 88 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am.  Low around 68. Southeast wind 3 to 5 mph.  Chance of precipitation is 80%.

    Low: 68 °F

    Chance
    T-storms then
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm.  Mostly cloudy, with a high near 84. South wind 3 to 5 mph.  Chance of precipitation is 70%.

    High: 84 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 20 percent chance of showers and thunderstorms before 1am.  Partly cloudy, with a low around 65.

    Low: 65 °F

    Slight Chance
    T-storms

  • Friday

    Friday: Partly sunny, with a high near 86.

    High: 86 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Partly cloudy, with a low around 66.

    Low: 66 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 87. Calm wind becoming south around 5 mph.
Tonight
Mostly clear, with a low around 65. Light southeast wind.
Wednesday
Mostly sunny, with a high near 88. South wind 3 to 6 mph.
Wednesday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 68. Southeast wind 3 to 5 mph. Chance of precipitation is 80%.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Mostly cloudy, with a high near 84. South wind 3 to 5 mph. Chance of precipitation is 70%.
Thursday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 65.
Friday
Partly sunny, with a high near 86.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 66.
Saturday
Mostly sunny, with a high near 88.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 72.
Monday
Mostly sunny, with a high near 92.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles N Chesterfield IL
 39.3°N 90.09°W (Elev. 515 ft)
5:21 am CDT Aug 4, 2026
8am CDT Aug 4, 2026-6pm CDT Aug 10, 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