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May in Osan averages a daily high of 23.7°C. Expect roughly 13 wet days totalling 158.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Osan is June.
Based on SEOUL CITY, KS (47km), 1995–2024. 23 years of May data.
See all twelve months for Osan →