May in Saint Joseph averages a daily high of 24.6°C with nights around 12.1°C. Expect roughly 12.4 wet days totalling 114.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Saint Joseph is April–May.
Based on ST JOSEPH ROSECRANS MEMORIAL AIRPORT, MO US (5.4km), 1995–2024. 28 years of May data.