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

Hazardous Weather Conditions

Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56°NLon: 90.15°WElev: 410ft.

Fair

78°F

26°C

Humidity 76%
Wind Speed S 9 mph
Barometer 29.80 in (1008.8 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 21 Jun 10:53 am CDT
Extended Forecast for

4 Miles S Troy IL

Flood Watch June 21, 11:34am until June 22, 01:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch June 21, 11:34am until June 22, 01:00am

    NOW until 1:00am Mon

    Flood Watch

  • Today

    High: 81 °F

    Heavy Rain

  • Tonight

    Tonight: Scattered showers and thunderstorms before 1am, then isolated showers between 1am and 4am. Cloudy, with a low around 65. Southwest wind 8 to 10 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 50%.

    Low: 65 °F

    Scattered
    T-storms then
    Isolated
    T-storms

  • Monday

    Monday: Mostly cloudy, with a high near 77. North wind around 11 mph.

    High: 77 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy during the early evening, then becoming mostly clear, with a low around 61. North wind 5 to 8 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 82. Light northeast wind.

    High: 82 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 63.

    Low: 63 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.

    High: 84 °F

    Slight Chance
    T-storms

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Today
Showers and thunderstorms. Some of the storms could produce heavy rainfall. High near 81. South wind 10 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 80%.
Tonight
Scattered showers and thunderstorms before 1am, then isolated showers between 1am and 4am. Cloudy, with a low around 65. Southwest wind 8 to 10 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 50%.
Monday
Mostly cloudy, with a high near 77. North wind around 11 mph.
Monday Night
Mostly cloudy during the early evening, then becoming mostly clear, with a low around 61. North wind 5 to 8 mph becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 82. Light northeast wind.
Tuesday Night
Mostly clear, with a low around 63.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 65.
Thursday
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 84.
Thursday Night
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 20%.
Friday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 84.
Friday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Saturday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles S Troy IL
 38.68°N 89.92°W (Elev. 574 ft)
Last Update:
11:11 am CDT Jun 21, 2026
Forecast Valid:
11am CDT Jun 21, 2026-6pm CDT Jun 27, 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