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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Columbia IL

  • Overnight

    Overnight: Partly cloudy, with a low around 73. Southwest wind around 5 mph.

    Low: 73 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 94. Heat index values as high as 100. Light and variable wind becoming northwest around 6 mph in the morning.

    High: 94 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 68. Northeast wind 3 to 6 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

  • Monday

    Monday: A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. North wind 5 to 8 mph. Chance of precipitation is 40%.

    High: 81 °F

    Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 62. North wind 5 to 8 mph.

    Low: 62 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 73.

    High: 73 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 55.

    Low: 55 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 54.

    Low: 54 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 73. Southwest wind around 5 mph.
Sunday
Partly sunny, with a high near 94. Heat index values as high as 100. Light and variable wind becoming northwest around 6 mph in the morning.
Sunday Night
A chance of showers and thunderstorms before 10pm, then showers likely and possibly a thunderstorm between 10pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 68. Northeast wind 3 to 6 mph. Chance of precipitation is 60%.
Monday
A chance of showers and thunderstorms before 10am, then a slight chance of showers between 10am and 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 81. North wind 5 to 8 mph. Chance of precipitation is 40%.
Monday Night
A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 62. North wind 5 to 8 mph.
Tuesday
Partly sunny, with a high near 73.
Tuesday Night
Mostly cloudy, with a low around 55.
Wednesday
Mostly sunny, with a high near 74.
Wednesday Night
Partly cloudy, with a low around 54.
Thursday
Mostly sunny, with a high near 75.
Thursday Night
Partly cloudy, with a low around 56.
Friday
Partly sunny, with a high near 77.
Friday Night
Partly cloudy, with a low around 55.
Saturday
Mostly sunny, with a high near 79.
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ABOUT THIS FORECAST

 
Point Forecast:
Columbia IL
 38.46°N 90.24°W (Elev. 407 ft)
Last Update:
1:26 am CDT Sep 20, 2026
Forecast Valid:
2am CDT Sep 20, 2026-6pm CDT Sep 26, 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