May in Kingston averages a daily high of 19.2°C with nights around 7.4°C. Expect roughly 12.4 wet days totalling 76.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Kingston is May–September.
Based on HARTINGTON IHD, ON CA (27.8km), 1995–2024. 28 years of May data.