August in Joplin averages a daily high of 32.6°C with nights around 20.5°C. Expect roughly 7.5 wet days totalling 87.7mm. 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 August data.