St. Charles, Missouri Weather:
Tuesday, September 15, 2026
Cloudy Weather
Day 81°
Night 63°
Precipitation 10 %
Wind 2 mph
UV Index (0 - 11+) 6
Weather Forecast History
Last Year's Weather on This Day (September 15, 2025)
Cloudy Weather

Day

95°

Night

63°

Wind

6 mph

UV Index

60

Precipitation

3 %