May in Joplin averages a daily high of 25.1°C with nights around 13.7°C. Expect roughly 12.9 wet days totalling 177.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Joplin is September–October.
Based on JOPLIN REGIONAL AIRPORT, MO US (7.7km), 1995–2024. 30 years of May data.