September in Fukuoka averages a daily high of 28.7°C. Expect roughly 11.3 wet days totalling 183.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Fukuoka is April–May.
Based on FUKUOKA, JA (3.6km), 1995–2024. 21 years of September data.