July in Hyesan averages a daily high of 27.7°C with nights around 15.2°C. Expect roughly 16 wet days totalling 151mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Hyesan is May.
Based on HYESAN, KN (0.9km), 1995–2024. 22 years of July data.