Current conditions at

St. Louis Downtown Airport (KCPS)

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

Fair

85°F

29°C

Humidity 75%
Wind Speed SE 10 mph
Barometer 29.98 in (1014.6 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index95°F (35°C)
Last update 29 Jun 9:53 am CDT
Detailed forecast for

St. Clair County

Rest Of Today
Mostly sunny. Hot with highs in the mid 90s. South winds 10 to 15 mph. Heat index values up to 110.
Tonight
Mostly clear. Humid with lows in the mid 70s. South winds 10 to 15 mph. Heat index values up to 109 early in the evening.
Tuesday
Sunny, hot with highs in the upper 90s. Southwest winds 5 to 10 mph. Heat index values up to 110.
Tuesday Night
Clear with lows in the mid 70s. South winds 5 to 10 mph. Heat index values up to 110 early in the evening.
Wednesday
Sunny, hot with highs in the upper 90s. South winds 5 to 10 mph. Heat index values up to 109.
Wednesday Night Through Thursday Night
Mostly clear. Hot. Lows in the upper 70s. Highs in the upper 90s. Heat index values up to 110.
Friday
Sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110.
Friday Night
Partly cloudy in the evening, then becoming mostly clear. Lows in the mid 70s. Heat index values up to 110 early in the evening.
Independence Day
Sunny. A slight chance of showers and thunderstorms in the afternoon. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 105.
Saturday Night
Partly cloudy. A slight chance of showers and thunderstorms after midnight. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 105 early in the evening.
Sunday
Mostly sunny. A slight chance of showers and thunderstorms in the morning, then a chance of showers and thunderstorms in the afternoon. Highs in the lower 90s. Chance of rain 30 percent. Heat index values up to 100.



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923 AM CDT Mon Jun 29 2026
 
 

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