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

67°F

19°C

Humidity 75%
Wind Speed NA
Barometer 29.76 in
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 18 Oct 2:35 am CDT
Extended Forecast for

Grantfork IL

  • Overnight

    Overnight: Mostly clear, with a low around 61. South wind around 9 mph.

    Low: 61 °F

    Mostly Clear

  • Saturday

    Saturday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11am. High near 76. South wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 76 °F

    Showers

  • Saturday Night

    Saturday Night: Showers, mainly before 4am. The rain could be heavy at times. Low around 49. Breezy, with a south wind 8 to 13 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 100%.

    Low: 49 °F

    Heavy Rain
    and Breezy

  • Sunday

    Sunday: A 30 percent chance of showers before 7am. Cloudy through mid morning, then gradual clearing, with a high near 63. Breezy, with a northwest wind 17 to 22 mph, with gusts as high as 31 mph.

    High: 63 °F

    Breezy.
    Chance
    Showers then
    Sunny

  • Sunday Night

    Sunday Night: Clear, with a low around 42. West wind 5 to 7 mph becoming calm.

    Low: 42 °F

    Clear

  • Monday

    Monday: Sunny, with a high near 71. Breezy.

    High: 71 °F

    Sunny then
    Sunny and
    Breezy

  • Monday Night

    Monday Night: Mostly clear, with a low around 47.

    Low: 47 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 38.

    Low: 38 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly clear, with a low around 61. South wind around 9 mph.
Saturday
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 11am. High near 76. South wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Saturday Night
Showers, mainly before 4am. The rain could be heavy at times. Low around 49. Breezy, with a south wind 8 to 13 mph becoming northwest 15 to 20 mph after midnight. Winds could gust as high as 31 mph. Chance of precipitation is 100%.
Sunday
A 30 percent chance of showers before 7am. Cloudy through mid morning, then gradual clearing, with a high near 63. Breezy, with a northwest wind 17 to 22 mph, with gusts as high as 31 mph.
Sunday Night
Clear, with a low around 42. West wind 5 to 7 mph becoming calm.
Monday
Sunny, with a high near 71. Breezy.
Monday Night
Mostly clear, with a low around 47.
Tuesday
Sunny, with a high near 63.
Tuesday Night
Mostly clear, with a low around 38.
Wednesday
Sunny, with a high near 64.
Wednesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 43.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 68.
Thursday Night
A 20 percent chance of showers. Partly cloudy, with a low around 42.
Friday
Mostly sunny, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grantfork IL
 38.82°N 89.65°W (Elev. 577 ft)
Last Update:
1:06 am CDT Oct 18, 2025
Forecast Valid:
2am CDT Oct 18, 2025-6pm CDT Oct 24, 2025
 
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