June in Mainz averages a daily high of 24.2°C with nights around 13.6°C. Expect roughly 9.9 wet days totalling 52.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Mainz is May–September.
Based on MAINZ LERCHENBERG ZDF, GM (5.1km), 1995–2024. 29 years of June data.