January in Rijeka averages a daily high of 9.7°C with nights around 3.4°C. Expect roughly 9.5 wet days totalling 131.6mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Rijeka is May–June.
Based on RIJEKA, HR (0.9km), 1995–2024. 29 years of January data.