September in Okayama averages a daily high of 28.8°C. Expect roughly 9.3 wet days totalling 150.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Okayama is April–May.
Based on OKAYAMA, JA (2.4km), 1995–2024. 26 years of September data.