May in Rijeka averages a daily high of 22.5°C with nights around 13.6°C. Expect roughly 10.6 wet days totalling 119.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Rijeka is May–June.
Based on RIJEKA, HR (0.9km), 1995–2024. 29 years of May data.