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.

Overcast

73°F

23°C

Humidity 96%
Wind Speed Calm
Barometer 29.91 in (1012.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 20 Aug 12:53 am CDT
Extended Forecast for

Columbia IL

  • Overnight

    Overnight: Patchy fog after 4am. Otherwise, partly cloudy, with a low around 70. Calm wind.

    Low: 70 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Calm wind becoming north 5 to 7 mph in the morning.

    High: 83 °F

    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Mostly Clear
    then Patchy
    Fog

  • 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 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 86.

    High: 86 °F

    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 84.

    High: 84 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Slight Chance
    Showers

Detailed Forecast

Overnight
Patchy fog after 4am. Otherwise, partly cloudy, with a low around 70. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, partly sunny, with a high near 83. Calm wind becoming north 5 to 7 mph in the morning.
Thursday Night
Patchy fog after 4am. Otherwise, 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 68. Calm wind.
Saturday
Sunny, with a high near 86.
Saturday Night
Mostly clear, with a low around 66.
Sunday
Mostly sunny, with a high near 84.
Sunday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 65.
Monday
A 20 percent chance of showers before 1pm. Partly sunny, with a high near 85.
Monday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 67.
Tuesday
A 20 percent chance of showers. Mostly sunny, with a high near 88.
Tuesday Night
Partly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 89.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Columbia IL
 38.46°N 90.21°W (Elev. 436 ft)
Last Update:
1:20 am CDT Aug 20, 2026
Forecast Valid:
1am 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

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High Temperature

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Chance of Precipitation