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

57°F

14°C

Humidity 72%
Wind Speed Calm
Barometer 29.91 in
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 20 Mar 11:55 pm CDT
Extended Forecast for

Brighton IL

  • Overnight

    Overnight: Mostly clear, with a low around 50. East wind around 6 mph.

    Low: 50 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 83. East wind around 7 mph becoming southwest in the afternoon.

    High: 83 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62. South wind 6 to 10 mph.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 83. Southwest wind 10 to 18 mph becoming north in the afternoon.

    High: 83 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 38. Breezy, with a north wind 14 to 21 mph, with gusts as high as 30 mph.

    Low: 38 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Clear

  • Monday

    Monday: Sunny, with a high near 56.

    High: 56 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 59.

    High: 59 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy
    then Slight
    Chance
    T-storms

Detailed Forecast

Overnight
Mostly clear, with a low around 50. East wind around 6 mph.
Saturday
Sunny, with a high near 83. East wind around 7 mph becoming southwest in the afternoon.
Saturday Night
Mostly clear, with a low around 62. South wind 6 to 10 mph.
Sunday
Increasing clouds, with a high near 83. Southwest wind 10 to 18 mph becoming north in the afternoon.
Sunday Night
Partly cloudy, with a low around 38. Breezy, with a north wind 14 to 21 mph, with gusts as high as 30 mph.
Monday
Sunny, with a high near 56.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Partly sunny, with a high near 59.
Tuesday Night
A 20 percent chance of rain and thunderstorms after 1am. Mostly cloudy, with a low around 42.
Wednesday
Mostly cloudy, with a high near 66.
Wednesday Night
Mostly cloudy, with a low around 50.
Thursday
A 20 percent chance of rain. Sunny, with a high near 77.
Thursday Night
A 40 percent chance of rain. Partly cloudy, with a low around 39.
Friday
A 20 percent chance of rain. Partly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Brighton IL
 39.04°N 90.13°W (Elev. 650 ft)
Last Update:
10:26 pm CDT Mar 20, 2026
Forecast Valid:
12am CDT Mar 21, 2026-6pm CDT Mar 27, 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