September in Dartford averages a daily high of 20.6°C with nights around 11.9°C. Expect roughly 10.2 wet days totalling 49.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Dartford is May–September.
Based on HEATHROW, UK (16.6km), 1995–2024. 30 years of September data.