May in Gillingham averages a daily high of 18.4°C with nights around 7.4°C. Expect roughly 10.8 wet days totalling 43mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Gillingham is May–September.
Based on WISLEY, UK (10.2km), 1995–2024. 25 years of May data.