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

41°F

5°C

Humidity 63%
Wind Speed Calm
Barometer 30.08 in
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Last update 14 Mar 12:15 am CDT
Extended Forecast for

Pierron IL

  • Overnight

    Overnight: Partly cloudy, with a low around 35. Calm wind becoming northeast around 5 mph.

    Low: 35 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 61. Southeast wind 6 to 15 mph.

    High: 61 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 52. South wind 10 to 18 mph, with gusts as high as 28 mph.

    Low: 52 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 66. Windy, with a south wind 22 to 30 mph, with gusts as high as 40 mph. Chance of precipitation is 80%.

    High: 66 °F

    Slight Chance
    Rain and
    Breezy then
    Showers and
    Windy

  • Sunday Night

    Sunday Night: Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 22. Breezy, with a west wind 24 to 28 mph, with gusts as high as 43 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.

    Low: 22 °F

    Rain/Snow and
    Breezy

  • Monday

    Monday: A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 27. Blustery.

    High: 27 °F

    Chance Snow
    and Blustery

  • Monday Night

    Monday Night: Partly cloudy, with a low around 11. Blustery.

    Low: 11 °F

    Partly Cloudy
    and Blustery
    then Mostly
    Clear

  • Tuesday

    Tuesday: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A chance of rain and snow after 1am. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Rain/Snow

Detailed Forecast

Overnight
Partly cloudy, with a low around 35. Calm wind becoming northeast around 5 mph.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 61. Southeast wind 6 to 15 mph.
Saturday Night
Partly cloudy, with a low around 52. South wind 10 to 18 mph, with gusts as high as 28 mph.
Sunday
Rain, mainly between 1pm and 4pm, then showers and possibly a thunderstorm after 4pm. High near 66. Windy, with a south wind 22 to 30 mph, with gusts as high as 40 mph. Chance of precipitation is 80%.
Sunday Night
Rain before 10pm, then snow, possibly mixed with rain between 10pm and 1am, then a chance of snow after 1am. Some thunder is also possible. Low around 22. Breezy, with a west wind 24 to 28 mph, with gusts as high as 43 mph. Chance of precipitation is 90%. New snow accumulation of less than one inch possible.
Monday
A 30 percent chance of snow before 1pm. Mostly cloudy, with a high near 27. Blustery.
Monday Night
Partly cloudy, with a low around 11. Blustery.
Tuesday
Sunny, with a high near 34.
Tuesday Night
A chance of rain and snow after 1am. Mostly cloudy, with a low around 27. Chance of precipitation is 30%.
Wednesday
Partly sunny, with a high near 59.
Wednesday Night
Mostly clear, with a low around 38.
Thursday
Mostly sunny, with a high near 66.
Thursday Night
Mostly clear, with a low around 43.
Friday
Mostly sunny, with a high near 65.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Pierron IL
 38.78°N 89.57°W (Elev. 512 ft)
Last Update:
11:46 pm CDT Mar 13, 2026
Forecast Valid:
12am CDT Mar 14, 2026-6pm CDT Mar 20, 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

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation