September in Carlisle averages a daily high of 16.6°C with nights around 8.3°C. Expect roughly 14.3 wet days totalling 78.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Carlisle is June–September.
Based on NEWTON RIGG, UK (26.9km), 1995–2024. 26 years of September data.