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

51°F

11°C

Humidity 66%
Wind Speed S 3 mph
Barometer 30.09 in
Dewpoint 40°F (4°C)
Visibility 10.00 mi
Last update 14 Nov 12:35 am CST
Extended Forecast for

Dorchester IL

  • Overnight

    Overnight: Partly cloudy, with a low around 46. Southeast wind around 6 mph.

    Low: 46 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 74. Southwest wind 6 to 10 mph.

    High: 74 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 57. Southwest wind 6 to 10 mph.

    Low: 57 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 76. Southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 23 mph.

    High: 76 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40. North wind 6 to 10 mph.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 58.

    High: 58 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 36.

    Low: 36 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of rain after noon. Mostly sunny, with a high near 56.

    High: 56 °F

    Mostly Sunny
    then Slight
    Chance Rain

  • Monday Night

    Monday Night: Rain likely, mainly before midnight. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.

    Low: 42 °F

    Rain Likely

Detailed Forecast

Overnight
Partly cloudy, with a low around 46. Southeast wind around 6 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 74. Southwest wind 6 to 10 mph.
Friday Night
Partly cloudy, with a low around 57. Southwest wind 6 to 10 mph.
Saturday
Partly sunny, with a high near 76. Southwest wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 23 mph.
Saturday Night
Mostly clear, with a low around 40. North wind 6 to 10 mph.
Sunday
Sunny, with a high near 58.
Sunday Night
Mostly clear, with a low around 36.
Monday
A 20 percent chance of rain after noon. Mostly sunny, with a high near 56.
Monday Night
Rain likely, mainly before midnight. Mostly cloudy, with a low around 42. Chance of precipitation is 60%.
Tuesday
A 20 percent chance of rain before noon. Partly sunny, with a high near 59.
Tuesday Night
A 20 percent chance of rain. Mostly cloudy, with a low around 41.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 57.
Wednesday Night
Rain likely. Cloudy, with a low around 45. Chance of precipitation is 60%.
Thursday
Rain likely. Mostly cloudy, with a high near 59. Chance of precipitation is 60%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Dorchester IL
 39.08°N 89.9°W (Elev. 659 ft)
Last Update:
9:41 pm CST Nov 13, 2025
Forecast Valid:
12am CST Nov 14, 2025-6pm CST Nov 20, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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