The weather observed at ST. LOUIS, MO (KSTL) at 02:51 PM CST was: The skies were clear. Temperature: 58F ( 14C) Dewpoint: 35F ( 2C) Relative Humidity: 42% Winds from the W (260 degs) at 3 mph. Pressure: 1025.3 millibars. Altimeter:30.27 inches of mercury. The prevailing visibility was 10 miles.