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

79°F

26°C

Humidity 65%
Wind Speed NE 6 mph
Barometer 29.96 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 29 Jul 7:45 pm CDT
Extended Forecast for

Dorchester IL

  • Tonight

    Tonight: Clear, with a low around 63. East wind 3 to 5 mph.

    Low: 63 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 84. Southeast wind 3 to 6 mph.

    High: 84 °F

    Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 64. Southeast wind 3 to 5 mph.

    Low: 64 °F

    Partly Cloudy

  • Friday

    Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 81. South wind 6 to 14 mph. Chance of precipitation is 70%.

    High: 81 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm before 4am, then showers likely. Low around 65. Southeast wind 9 to 14 mph becoming west after midnight. Chance of precipitation is 80%.

    Low: 65 °F

    Showers

  • Saturday

    Saturday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.

    High: 77 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.

    Low: 62 °F

    Slight Chance
    T-storms

  • Sunday

    Sunday: A 20 percent chance of showers after 1pm. Sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
Clear, with a low around 63. East wind 3 to 5 mph.
Thursday
Sunny, with a high near 84. Southeast wind 3 to 6 mph.
Thursday Night
Partly cloudy, with a low around 64. Southeast wind 3 to 5 mph.
Friday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 81. South wind 6 to 14 mph. Chance of precipitation is 70%.
Friday Night
Showers and possibly a thunderstorm before 4am, then showers likely. Low around 65. Southeast wind 9 to 14 mph becoming west after midnight. Chance of precipitation is 80%.
Saturday
A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 77. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.
Sunday
A 20 percent chance of showers after 1pm. Sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 62.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 64.
Tuesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 66.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Dorchester IL
 39.08°N 89.9°W (Elev. 659 ft)
Last Update:
5:26 pm CDT Jul 29, 2026
Forecast Valid:
8pm CDT Jul 29, 2026-6pm CDT Aug 5, 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