April in Ŭndŏk averages a daily high of 12.5°C with nights around 3°C. Expect roughly 6.4 wet days totalling 43.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Ŭndŏk is September.
Based on POSET, RS (40.8km), 1995–2024. 30 years of April data.