January in Osijek averages a daily high of 4.4°C with nights around -2.3°C. Expect roughly 10.4 wet days totalling 45.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Osijek is April–October.
Based on OSIJEK, HR (5.1km), 1995–2024. 29 years of January data.