July in Haeju averages a daily high of 27.3°C with nights around 21.2°C. Expect roughly 15 wet days totalling 227.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Haeju is September–October.
Based on HAEJU, KN (1.5km), 1995–2024. 23 years of July data.