Current conditions at

St. Louis Downtown Airport (KCPS)

Lat: 38.56° N Lon: 90.15° W Elev: 410 ft.

Fair

94°F

34°C

Humidity 54%
Wind Speed Vrbl 7 mph
Barometer 29.75 in (1006.8 mb)
Dewpoint 75°F (24°C)
Visibility 10.00 mi
Heat Index106°F (41°C)
Last update 27 Jul 5:53 pm CDT
Detailed forecast for

St. Clair County

Tonight
Partly cloudy. A slight chance of showers and thunderstorms this evening. Lows in the upper 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 113 early this evening.
Tuesday
Sunny in the morning, then partly sunny with isolated showers and thunderstorms in the afternoon. Humid with highs around 90. North winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 105.
Tuesday Night
Mostly cloudy in the evening, then becoming partly cloudy. Isolated showers and thunderstorms. Cooler with lows in the upper 60s. Northeast winds 5 to 10 mph. Chance of rain 20 percent. Heat index values up to 100 early in the evening.
Wednesday
Sunny. Highs in the upper 80s. Northeast winds 5 to 10 mph.
Wednesday Night
Clear. Lows in the mid 60s. Northeast winds 5 to 10 mph in the evening, becoming light and variable.
Thursday
Sunny. Highs in the upper 80s.
Thursday Night
Partly cloudy. A slight chance of showers after midnight. Lows in the upper 60s. Chance of rain 20 percent.
Friday
Partly sunny with a chance of showers in the morning, then mostly cloudy with a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 50 percent.
Friday Night
Showers likely with a chance of thunderstorms. Lows in the upper 60s. Chance of rain 70 percent.
Saturday
Partly sunny. A chance of showers in the morning, then a chance of showers with a slight chance of thunderstorms in the afternoon. Highs in the lower 80s. Chance of rain 50 percent.
Saturday Night
Partly cloudy. A chance of showers with a slight chance of thunderstorms in the evening. Lows in the upper 60s. Chance of rain 50 percent.
Sunday
Mostly sunny. A slight chance of showers and thunderstorms in the afternoon. Highs in the mid 80s. Chance of rain 20 percent.
Sunday Night
Mostly clear. Lows in the upper 60s.
Monday
Sunny. A slight chance of showers in the afternoon. Highs in the mid 80s. Chance of rain 20 percent.



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453 PM CDT Mon Jul 27 2026
 
 

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