March in Mainz averages a daily high of 11.3°C with nights around 3.1°C. Expect roughly 11 wet days totalling 42.3mm. Demanding conditions — pack for it and plan indoor options.
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 March data.