The weather observed at ST. LOUIS, MO (KSTL) at 09:51 AM CDT was: The skies were mostly cloudy. Temperature: 58F ( 14C) Dewpoint: 49F ( 9C) Relative Humidity: 72% Winds from the SE (130 degs) at 16 mph. Pressure: 1012.1 millibars. Altimeter:29.90 inches of mercury. The prevailing visibility was 10 miles. There has been 0.00 inches of precipitation in the past hour. There has been 0.00 inches of precipitation in the past 6 hours.