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.

Fog/Mist

64°F

18°C

Humidity 97%
Wind Speed Calm
Barometer 30.04 in
Dewpoint 64°F (18°C)
Visibility 5.00 mi
Last update 4 Aug 6:35 am CDT
Extended Forecast for

4 Miles SSW South Roxana IL

  • Today

    Today: Sunny, with a high near 88. Light and variable wind.

    High: 88 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 68. Southeast wind 3 to 6 mph.

    Low: 68 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 90. Calm wind becoming south 5 to 7 mph in the morning.

    High: 90 °F

    Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am.  Mostly cloudy, with a low around 71. Southeast wind 5 to 7 mph.  Chance of precipitation is 70%.

    Low: 71 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm before 1pm.  Partly sunny, with a high near 87. South wind 5 to 7 mph.  Chance of precipitation is 70%.

    High: 87 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly after 1am.  Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Friday

    Friday: A 20 percent chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 87.

    High: 87 °F

    Partly Sunny
    then Slight
    Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 70.

    Low: 70 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 88. Light and variable wind.
Tonight
Mostly clear, with a low around 68. Southeast wind 3 to 6 mph.
Wednesday
Sunny, with a high near 90. Calm wind becoming south 5 to 7 mph in the morning.
Wednesday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 71. Southeast wind 5 to 7 mph. Chance of precipitation is 70%.
Thursday
Showers likely and possibly a thunderstorm before 1pm. Partly sunny, with a high near 87. South wind 5 to 7 mph. Chance of precipitation is 70%.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 70.
Friday
A 20 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87.
Friday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 70.
Saturday
Mostly sunny, with a high near 89.
Saturday Night
Mostly clear, with a low around 72.
Sunday
Sunny, with a high near 92.
Sunday Night
Mostly clear, with a low around 74.
Monday
Mostly sunny, with a high near 93.
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SSW South Roxana IL
 38.77°N 90.08°W (Elev. 427 ft)
5:21 am CDT Aug 4, 2026
6am 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