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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

64°F

18°C

Humidity 94%
Wind Speed S 14 mph
Barometer 29.96 in
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 18 May 9:50 pm CDT
Extended Forecast for

Troy IL

Flood Watch May 18, 10:19pm until May 19, 01:00pm
Flood Advisory until May 19, 12:00am
Click here for hazard details and duration
Flood Watch
Flood Advisory
  •  
    Flood Watch May 18, 10:19pm until May 19, 01:00pm
    Flood Advisory until May 19, 12:00am

    NOW: Multiple hazards in effect

    Click HERE for Details

  • Tonight

    Low: 65 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: Showers and thunderstorms likely, mainly after 4pm. Mostly cloudy, with a high near 82. Southwest wind 11 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.

    High: 82 °F

    Chance
    T-storms then
    T-storms
    Likely

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then showers likely after 1am. Cloudy, with a low around 58. North wind 8 to 10 mph. Chance of precipitation is 70%.

    Low: 58 °F

    T-storms
    Likely then
    Showers
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of showers. Mostly cloudy, with a high near 69. North wind 9 to 11 mph.

    High: 69 °F

    Slight Chance
    Showers

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 51. Northeast wind around 9 mph.

    Low: 51 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 72.

    High: 72 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 57.

    Low: 57 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.

    High: 74 °F

    Showers
    Likely

Detailed Forecast

Tonight
A slight chance of showers between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 65. South wind 9 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Tuesday
Showers and thunderstorms likely, mainly after 4pm. Mostly cloudy, with a high near 82. Southwest wind 11 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 60%.
Tuesday Night
Showers and thunderstorms likely before 7pm, then showers likely and possibly a thunderstorm between 7pm and 1am, then showers likely after 1am. Cloudy, with a low around 58. North wind 8 to 10 mph. Chance of precipitation is 70%.
Wednesday
A 20 percent chance of showers. Mostly cloudy, with a high near 69. North wind 9 to 11 mph.
Wednesday Night
Mostly cloudy, with a low around 51. Northeast wind around 9 mph.
Thursday
Partly sunny, with a high near 72.
Thursday Night
A 50 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 57.
Friday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 74. Chance of precipitation is 70%.
Friday Night
A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 61.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 80. Chance of precipitation is 30%.
Saturday Night
A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 62.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 83.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 65.
Memorial Day
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Troy IL
 38.72°N 89.89°W (Elev. 551 ft)
Last Update:
9:51 pm CDT May 18, 2026
Forecast Valid:
10pm CDT May 18, 2026-6pm CDT May 25, 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