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 61%
Wind Speed SW 9 mph
Barometer 30.10 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 24 Jun 10:50 am CDT
Extended Forecast for

Grantfork IL

  • Today

    Today: A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 81. Southwest wind around 7 mph.

    High: 81 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am. Mostly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, then gradually becoming sunny, with a high near 84. Light and variable wind.

    High: 84 °F

    Mostly Cloudy
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 67. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 90%.

    Low: 67 °F

    T-storms

  • Friday

    Friday: Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 81. Southwest wind 6 to 8 mph. Chance of precipitation is 90%.

    High: 81 °F

    T-storms

  • Friday Night

    Friday Night: Showers and thunderstorms likely. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 68. Chance of precipitation is 70%.

    Low: 68 °F

    Heavy Rain

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 85. Chance of precipitation is 60%.

    High: 85 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms

  • Sunday

    Sunday: Mostly sunny, with a high near 91.

    High: 91 °F

    Mostly Sunny

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 81. Southwest wind around 7 mph.
Tonight
A 30 percent chance of showers and thunderstorms, mainly between 3am and 5am. Mostly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm in the evening.
Thursday
A 40 percent chance of showers and thunderstorms, mainly after 3pm. Mostly cloudy, then gradually becoming sunny, with a high near 84. Light and variable wind.
Thursday Night
Showers and thunderstorms likely, then showers and possibly a thunderstorm after 1am. Low around 67. Calm wind becoming south around 5 mph after midnight. Chance of precipitation is 90%.
Friday
Showers and possibly a thunderstorm before 1pm, then showers and thunderstorms likely after 1pm. High near 81. Southwest wind 6 to 8 mph. Chance of precipitation is 90%.
Friday Night
Showers and thunderstorms likely. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 68. Chance of precipitation is 70%.
Saturday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 85. Chance of precipitation is 60%.
Saturday Night
A 30 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 71.
Sunday
Mostly sunny, with a high near 91.
Sunday Night
Mostly clear, with a low around 74.
Monday
Sunny, with a high near 93.
Monday Night
Clear, with a low around 75.
Tuesday
Sunny, with a high near 94.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Grantfork IL
 38.83°N 89.68°W (Elev. 551 ft)
Last Update:
8:31 am CDT Jun 24, 2026
Forecast Valid:
11am CDT Jun 24, 2026-6pm CDT Jun 30, 2026
 
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