St. Peters, Missouri Weather:
Wednesday, September 30, 2026
Cloudy Weather
Day 77°
Night 54°
Precipitation 1 %
Wind 6 mph
UV Index (0 - 11+) 5
Weather Forecast History
Last Year's Weather on This Day (September 30, 2025)
Cloudy Weather

Day

90°

Night

55°

Wind

4 mph

UV Index

50

Precipitation

1 %