December in Gillingham averages a daily high of 8.9°C with nights around 2.6°C. Expect roughly 15 wet days totalling 63.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Gillingham is May–September.
Based on WISLEY, UK (10.2km), 1995–2024. 27 years of December data.