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Osan in September

September in Osan averages a daily high of 26.3°C. Expect roughly 21 wet days totalling 253.7mm. 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. 19 years of September data.

See all twelve months for Osan →