September in Bunbury averages a daily high of 18.7°C with nights around 8.5°C. Expect roughly 13.8 wet days totalling 79.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bunbury is October–April.
Based on BUNBURY, AS (3.3km), 1995–2024. 28 years of September data.