September in Exeter averages a daily high of 18.9°C with nights around 11.7°C. Expect roughly 11.5 wet days totalling 70.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Exeter is June–September.
Based on SLAPTON, UK (48.8km), 1995–2024. 28 years of September data.