August in Sinŭiju averages a daily high of 29°C with nights around 20.4°C. Expect roughly 9 wet days totalling 314.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sinŭiju is September–October.
Based on SINUIJU, KN (1.3km), 1995–2024. 17 years of August data.