May in Bihać averages a daily high of 20.2°C with nights around 7.6°C. Expect roughly 12.1 wet days totalling 110mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Bihać is June–September.
Based on GOSPIC, HR (49.7km), 1995–2024. 29 years of May data.