January in St. Louis averages a daily high of 4.7°C with nights around -4.1°C. Expect roughly 8.2 wet days totalling 70.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit St. Louis is April–May.
Based on ST LOUIS SCIENCE CENTER, MO US (6.3km), 1995–2024. 17 years of January data.