National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

NWS St. Louis Announces Changes To May 16, 2025 Tornado Damage Assessment

After a year-long review of new ground survey data and aerial imagery, NWS St. Louis made several adjustments to the May 16, 2025 tornado damage assessment. Read More >

Hazardous Weather Conditions

Current conditions at

St. Louis Regional Airport (KALN)

Lat: 38.89°NLon: 90.03°WElev: 518ft.

Fair

66°F

19°C

Humidity 94%
Wind Speed E 3 mph
Barometer 29.90 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 16 May 11:35 pm CDT
Extended Forecast for

Grantfork IL

  • Tonight

    Tonight: Mostly cloudy, with a low around 65. Southeast wind around 7 mph.

    Low: 65 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 87. Breezy, with a south wind 11 to 21 mph, with gusts as high as 28 mph.

    High: 87 °F

    Mostly Sunny
    then Sunny
    and Breezy

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 68. South wind 14 to 17 mph, with gusts as high as 25 mph.

    Low: 68 °F

    Increasing
    Clouds

  • Monday

    Monday: Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 86. Breezy, with a south wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.

    High: 86 °F

    Breezy.
    Slight Chance
    T-storms then
    T-storms
    Likely

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 70. South wind around 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 86. Breezy. Chance of precipitation is 90%.

    High: 86 °F

    Breezy.
    Showers
    Likely then
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 60. Chance of precipitation is 80%.

    Low: 60 °F

    Showers

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 71.

    High: 71 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers. Mostly cloudy, with a low around 52.

    Low: 52 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
Mostly cloudy, with a low around 65. Southeast wind around 7 mph.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 87. Breezy, with a south wind 11 to 21 mph, with gusts as high as 28 mph.
Sunday Night
Increasing clouds, with a low around 68. South wind 14 to 17 mph, with gusts as high as 25 mph.
Monday
Showers and thunderstorms likely, mainly between 1pm and 4pm, then showers likely and possibly a thunderstorm after 4pm. Partly sunny, with a high near 86. Breezy, with a south wind 16 to 21 mph, with gusts as high as 29 mph. Chance of precipitation is 70%.
Monday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 70. South wind around 16 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.
Tuesday
Showers and possibly a thunderstorm. High near 86. Breezy. Chance of precipitation is 90%.
Tuesday Night
Showers and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Low around 60. Chance of precipitation is 80%.
Wednesday
A 20 percent chance of showers and thunderstorms before 1pm. Mostly cloudy, with a high near 71.
Wednesday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 52.
Thursday
Partly sunny, with a high near 70.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
A 20 percent chance of showers. Partly sunny, with a high near 73.
Friday Night
A 20 percent chance of showers. Mostly cloudy, with a low around 56.
Saturday
A 20 percent chance of showers. Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Grantfork IL
 38.83°N 89.68°W (Elev. 551 ft)
Last Update:
11:36 pm CDT May 16, 2026
Forecast Valid:
11pm CDT May 16, 2026-6pm CDT May 23, 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