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

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

68°F

20°C

Humidity 78%
Wind Speed S 6 mph
Barometer 30.00 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 12 Oct 8:50 am CDT
Extended Forecast for

Hillsboro IL

  • Columbus Day

    Columbus Day: Increasing clouds, with a high near 92. Southwest wind 5 to 13 mph, with gusts as high as 21 mph.

    High: 92 °F

    Increasing
    Clouds

  • Tonight

    Tonight: Mostly cloudy, then gradually becoming clear, with a low around 68. Southwest wind 6 to 8 mph.

    Low: 68 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Sunny, with a high near 93. Southwest wind 6 to 9 mph.

    High: 93 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 69. Calm wind becoming south around 5 mph.

    Low: 69 °F

    Mostly Clear
    then Chance
    T-storms

  • Wednesday

    Wednesday: Showers and possibly a thunderstorm. High near 81. Light southwest wind. Chance of precipitation is 90%.

    High: 81 °F

    Showers

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.

    Low: 62 °F

    Showers
    Likely

  • Thursday

    Thursday: Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Thursday Night

    Thursday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 48.

    Low: 48 °F

    Chance
    T-storms

  • Friday

    Friday: Mostly sunny, with a high near 62. Breezy.

    High: 62 °F

    Mostly Sunny
    and Breezy

Detailed Forecast

Columbus Day
Increasing clouds, with a high near 92. Southwest wind 5 to 13 mph, with gusts as high as 21 mph.
Tonight
Mostly cloudy, then gradually becoming clear, with a low around 68. Southwest wind 6 to 8 mph.
Tuesday
Sunny, with a high near 93. Southwest wind 6 to 9 mph.
Tuesday Night
A 50 percent chance of showers and thunderstorms after 1am. Increasing clouds, with a low around 69. Calm wind becoming south around 5 mph.
Wednesday
Showers and possibly a thunderstorm. High near 81. Light southwest wind. Chance of precipitation is 90%.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 62. Chance of precipitation is 70%.
Thursday
Showers and possibly a thunderstorm. High near 79. Chance of precipitation is 80%.
Thursday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 48.
Friday
Mostly sunny, with a high near 62. Breezy.
Friday Night
Mostly clear, with a low around 35.
Saturday
Sunny, with a high near 61.
Saturday Night
Clear, with a low around 34.
Sunday
Sunny, with a high near 68.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Hillsboro IL
 39.17°N 89.49°W (Elev. 581 ft)
Last Update:
9:16 am CDT Oct 12, 2026
Forecast Valid:
9am CDT Oct 12, 2026-6pm CDT Oct 18, 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