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

42°F

6°C

Humidity 56%
Wind Speed NW 3 mph
Barometer 29.69 in
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Last update 25 Feb 3:55 am CST
Extended Forecast for

Dorchester IL

  • Today

    Today: Mostly cloudy, with a high near 49. North wind around 6 mph becoming light and variable in the afternoon.

    High: 49 °F

    Mostly Cloudy

  • Tonight

    Tonight: A 50 percent chance of rain, mainly after 8pm. Mostly cloudy, with a low around 32. Northeast wind 3 to 6 mph.

    Low: 32 °F

    Chance Rain

  • Thursday

    Thursday: Mostly sunny, with a high near 50. East wind around 6 mph becoming light and variable in the afternoon.

    High: 50 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 33. Calm wind becoming south around 6 mph after midnight.

    Low: 33 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 65. Southwest wind 6 to 14 mph.

    High: 65 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A 20 percent chance of rain. Mostly cloudy, with a low around 29.

    Low: 29 °F

    Slight Chance
    Rain

  • Sunday

    Sunday: A slight chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.

    High: 42 °F

    Slight Chance
    Rain then
    Chance
    Rain/Snow

Detailed Forecast

Today
Mostly cloudy, with a high near 49. North wind around 6 mph becoming light and variable in the afternoon.
Tonight
A 50 percent chance of rain, mainly after 8pm. Mostly cloudy, with a low around 32. Northeast wind 3 to 6 mph.
Thursday
Mostly sunny, with a high near 50. East wind around 6 mph becoming light and variable in the afternoon.
Thursday Night
Mostly clear, with a low around 33. Calm wind becoming south around 6 mph after midnight.
Friday
Sunny, with a high near 65. Southwest wind 6 to 14 mph.
Friday Night
Mostly clear, with a low around 39.
Saturday
Mostly sunny, with a high near 58.
Saturday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 29.
Sunday
A slight chance of rain before noon, then a chance of rain and snow. Mostly cloudy, with a high near 42. Chance of precipitation is 40%.
Sunday Night
Rain and snow likely, mainly before midnight. Mostly cloudy, with a low around 28. Chance of precipitation is 60%.
Monday
A 30 percent chance of rain. Mostly cloudy, with a high near 38.
Monday Night
A 40 percent chance of rain and thunderstorms. Mostly cloudy, with a low around 27.
Tuesday
A 50 percent chance of rain. Mostly cloudy, with a high near 43.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dorchester IL
 39.08°N 89.9°W (Elev. 659 ft)
Last Update:
1:51 am CST Feb 25, 2026
Forecast Valid:
4am CST Feb 25, 2026-6pm CST Mar 3, 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