April in Rennes averages a daily high of 16.2°C with nights around 5.9°C. Expect roughly 11.6 wet days totalling 50.1mm. 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 April data.