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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.

Thunderstorm

66°F

19°C

Humidity 94%
Wind Speed Calm
Barometer 30.03 in
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 18 May 12:45 pm CDT
Extended Forecast for

Troy IL

Flood Watch May 18, 01:17pm until May 18, 07:00pm
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch May 18, 01:17pm until May 18, 07:00pm

    NOW until 7:00pm Mon

    Flood Watch

  • This Afternoon

    High: 72 °F

    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 9pm. Mostly cloudy, with a low around 67. South wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.

    Low: 67 °F

    Showers
    Likely then
    Partly Cloudy

  • Tuesday

    Tuesday: Showers and thunderstorms before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then showers and thunderstorms likely after 5pm. High near 85. Southwest wind 11 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

    High: 85 °F

    Showers then
    T-storms

  • Tuesday Night

    Tuesday Night: Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm between 11pm and 4am, then showers likely after 4am. Mostly cloudy, with a low around 58. North wind 8 to 10 mph. Chance of precipitation is 70%.

    Low: 58 °F

    Showers
    Likely

  • Wednesday

    Wednesday: A 20 percent chance of showers. Partly sunny, 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.

    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

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. Steady temperature around 72. South wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 90%.
Tonight
Showers and thunderstorms likely, mainly before 9pm. Mostly cloudy, with a low around 67. South wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%.
Tuesday
Showers and thunderstorms before 4pm, then showers and possibly a thunderstorm between 4pm and 5pm, then showers and thunderstorms likely after 5pm. High near 85. Southwest wind 11 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.
Tuesday Night
Showers and thunderstorms likely before 11pm, then showers likely and possibly a thunderstorm between 11pm and 4am, then showers likely after 4am. Mostly cloudy, with a low around 58. North wind 8 to 10 mph. Chance of precipitation is 70%.
Wednesday
A 20 percent chance of showers. Partly sunny, with a high near 69. North wind 9 to 11 mph.
Wednesday Night
Mostly cloudy, with a low around 51.
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 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 80.
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.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Troy IL
 38.74°N 89.89°W (Elev. 551 ft)
Last Update:
12:11 pm CDT May 18, 2026
Forecast Valid:
1pm CDT May 18, 2026-6pm CDT May 24, 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