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

65°F

18°C

Humidity 98%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 1.00 mi
Last update 4 Aug 5:35 am CDT
Extended Forecast for

Donnellson IL

  • Today

    Today: Sunny, with a high near 85. Calm wind.

    High: 85 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Wednesday

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

    High: 87 °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 68. Light southeast wind.  Chance of precipitation is 60%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm.  High near 83. Calm wind becoming southwest around 5 mph.  Chance of precipitation is 80%.

    High: 83 °F

    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Friday

    Friday: Partly sunny, with a high near 84.

    High: 84 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am.  Partly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Saturday

    Saturday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 85. Calm wind.
Tonight
Mostly clear, with a low around 64. Calm wind.
Wednesday
Sunny, with a high near 87. Calm wind becoming south around 5 mph.
Wednesday Night
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 68. Light southeast wind. Chance of precipitation is 60%.
Thursday
Showers and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. High near 83. Calm wind becoming southwest around 5 mph. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Friday
Partly sunny, with a high near 84.
Friday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 67.
Saturday
Mostly sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 88.
Sunday Night
Mostly clear, with a low around 72.
Monday
Mostly sunny, with a high near 90.
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ABOUT THIS FORECAST

 
Point Forecast:
Donnellson IL
 39.04°N 89.5°W (Elev. 554 ft)
5:21 am CDT Aug 4, 2026
5am 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