September in Barnsley averages a daily high of 18.1°C with nights around 10.8°C. Expect roughly 12.2 wet days totalling 62.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Barnsley is June–September.
Based on SHEFFIELD, UK (18.8km), 1995–2024. 30 years of September data.