September in Blackburn averages a daily high of 18.1°C with nights around 10.5°C. Expect roughly 15 wet days totalling 104.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Blackburn is May–September.
Based on PRESTON MOOR PARK, UK (14.7km), 1995–2024. 24 years of September data.