September in Bihać averages a daily high of 21.2°C with nights around 8.5°C. Expect roughly 10 wet days totalling 159.8mm. 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 September data.