October in Rijeka averages a daily high of 19.6°C with nights around 11.9°C. Expect roughly 11 wet days totalling 195mm. 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 October data.