April in Sariwŏn-si averages a daily high of 16.3°C with nights around 6.7°C. Expect roughly 7 wet days totalling 57.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Sariwŏn-si is September–October.
Based on HAEJU, KN (53km), 1995–2024. 23 years of April data.