January in Cannes averages a daily high of 13.3°C with nights around 5.8°C. Expect roughly 6.6 wet days totalling 72.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Cannes is May–October.
Based on NICE, FR (19.2km), 1995–2024. 30 years of January data.