September in Gillingham averages a daily high of 20°C with nights around 10°C. Expect roughly 9.9 wet days totalling 54.7mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Gillingham is May–September.
Based on WISLEY, UK (10.2km), 1995–2024. 28 years of September data.