About Saint Peters, MO's Climate & Weather History

Saint Peters is a city of approximately 52,600 people in Missouri, United States. Located in the Central Time Zone at 38.8°N latitude.

In 2025, Saint Peters recorded an average annual temperature of 57°F. The hottest temperatures reached 97°F in August; the coolest were -2°F in January. Total precipitation for the year was 39 inches, with the wettest month being April. Snowfall for the year totaled approximately 8 inches.