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April in Osan averages a daily high of 17.8°C. Expect roughly 6 wet days totalling 78.8mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Osan is June.
Based on SEOUL CITY, KS (47km), 1995–2024. 21 years of April data.
See all twelve months for Osan →