January in Ongjin averages a daily high of 1.6°C with nights around -7°C. Expect roughly 5 wet days totalling 7.2mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Ongjin is September–October.
Based on HAEJU, KN (31.6km), 1995–2024. 21 years of January data.