September in Bath averages a daily high of 18.6°C with nights around 10.5°C. Expect roughly 11.9 wet days totalling 58.6mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bath is June–September.
Based on LYNEHAM, UK (29.3km), 1995–2024. 30 years of September data.