Current conditions at

St. Louis Lambert International Airport (KSTL)

Lat: 38.75° N Lon: 90.37° W Elev: 604 ft.

Partly Cloudy

85°F

29°C

Humidity 70%
Wind Speed S 9 mph
Barometer 30.03 in (1015.7 mb)
Dewpoint 74°F (23°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 18 Jul 6:51 pm CDT
Detailed forecast for

St. Louis County

Tonight
Mostly cloudy with scattered showers and thunderstorms. Lows in the mid 70s. Southeast winds around 5 mph. Chance of rain 30 percent.
Saturday
Mostly sunny with a chance of showers and thunderstorms. Humid with highs in the lower 90s. Southwest winds 5 to 10 mph. Chance of rain 50 percent. Heat index values up to 106 in the afternoon.
Saturday Night
A slight chance of thunderstorms in the evening. Mostly clear with a slight chance of showers. Humid with lows in the mid 70s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 104 early in the evening.
Sunday
Mostly sunny with a slight chance of showers and thunderstorms. Hot with highs in the mid 90s. Southwest winds around 5 mph. Chance of rain 20 percent. Heat index values up to 109.
Sunday Night
Mostly clear with a chance of showers and thunderstorms in the evening, then partly cloudy with a slight chance of showers and thunderstorms after midnight. Humid with lows in the mid 70s. South winds around 5 mph. Chance of rain 40 percent. Heat index values up to 107 early in the evening.
Monday And Monday Night
Partly cloudy. A slight chance of showers and thunderstorms. Highs in the mid 90s. Lows in the mid 70s. Chance of rain 20 percent. Heat index values up to 110.
Tuesday
Sunny. A slight chance of showers and thunderstorms in the morning. Hot with highs in the mid 90s. Chance of rain 20 percent. Heat index values up to 110.
Tuesday Night Through Friday
Mostly clear. Hot. Lows in the upper 70s. Highs in the upper 90s. Heat index values up to 110.



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539 PM CDT Fri Jul 18 2025
 
 

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database