March in Rennes averages a daily high of 13.3°C with nights around 4.4°C. Expect roughly 12.3 wet days totalling 51.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Rennes is May–September.
Based on RENNES ST JACQUES, FR (6.4km), 1995–2024. 30 years of March data.