October in Rennes averages a daily high of 17.7°C with nights around 9.6°C. Expect roughly 14.9 wet days totalling 77.1mm. Generally workable, with some weather to plan around.
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 October data.