March in Rijeka averages a daily high of 13.8°C with nights around 6.1°C. Expect roughly 8.8 wet days totalling 112mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Rijeka is May–June.
Based on RIJEKA, HR (0.9km), 1995–2024. 29 years of March data.