April in Bihać averages a daily high of 15.4°C with nights around 3.4°C. Expect roughly 12 wet days totalling 98.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bihać is June–September.
Based on GOSPIC, HR (49.7km), 1995–2024. 29 years of April data.