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

52°F

11°C

Humidity 81%
Wind Speed Calm
Barometer 30.08 in
Dewpoint 47°F (8°C)
Visibility 10.00 mi
Last update 9 Oct 3:35 am CDT
Extended Forecast for

4 Miles W Greenville IL

  • Overnight

    Overnight: Patchy fog. Otherwise, clear, with a low around 50. Calm wind.

    Low: 50 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 9am. Otherwise, sunny, with a high near 88. Calm wind becoming south 5 to 9 mph in the morning.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 58. Southeast wind 3 to 5 mph.

    Low: 58 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Mostly cloudy, with a high near 79. Calm wind becoming southeast 5 to 8 mph in the morning.

    High: 79 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 57. East wind 3 to 8 mph.

    Low: 57 °F

    Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 56.

    Low: 56 °F

    Mostly Clear

  • Columbus Day

    Columbus Day: Sunny, with a high near 91.

    High: 91 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Overnight
Patchy fog. Otherwise, clear, with a low around 50. Calm wind.
Friday
Patchy fog before 9am. Otherwise, sunny, with a high near 88. Calm wind becoming south 5 to 9 mph in the morning.
Friday Night
Increasing clouds, with a low around 58. Southeast wind 3 to 5 mph.
Saturday
Mostly cloudy, with a high near 79. Calm wind becoming southeast 5 to 8 mph in the morning.
Saturday Night
A 30 percent chance of showers, mainly before 1am. Mostly cloudy, with a low around 57. East wind 3 to 8 mph.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Mostly clear, with a low around 56.
Columbus Day
Sunny, with a high near 91.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Sunny, with a high near 88.
Tuesday Night
A 20 percent chance of showers. Mostly clear, with a low around 60.
Wednesday
A 40 percent chance of showers. Mostly sunny, with a high near 82.
Wednesday Night
A 30 percent chance of showers. Partly cloudy, with a low around 61.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 81.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles W Greenville IL
 38.91°N 89.48°W (Elev. 499 ft)
Last Update:
1:25 am CDT Oct 9, 2026
Forecast Valid:
3am CDT Oct 9, 2026-6pm CDT Oct 15, 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