March in Vannes averages a daily high of 12°C with nights around 7.2°C. Expect roughly 12.4 wet days totalling 50.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Vannes is June–September.
Based on BELLE ILE LE TALUT, FR (52.9km), 1995–2024. 30 years of March data.