May in Parma averages a daily high of 21.3°C with nights around 10.4°C. Expect roughly 13.4 wet days totalling 98.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Parma is May–September.
Based on CLEVELAND HOPKINS INTERNATIONAL AIRPORT, OH US (11.5km), 1995–2024. 30 years of May data.