Climate almanac
Saint Peters
Missouri, United States · 38.80°, -90.63°
What is the climate like in Saint Peters?
The best time to visit Saint Peters is typically September – October, with trip comfort peaking in September (7.4/10). Saint Peters is warmest in July, when daily highs average 88°F (31°C), and coolest in January, when lows fall to about 26°F (-3°C). The wettest month is typically May and the driest is December; the year sees roughly 43 in (1093 mm) of precipitation.
- Best time to visitSeptember – October — comfort peaks in September (7.4/10)
- Warmest monthJuly — average high 88°F (31°C)
- Coolest monthJanuary — average low 26°F (-3°C)
- Wettest monthMay (5.2 in (132 mm))
- Driest monthDecember (2.1 in (53 mm))
- Annual precipitation43 in (1093 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)
- Records fromSt Charles Elm Pt, 10 km away (1893-2026)