May in Bolton averages a daily high of 16.4°C with nights around 7.7°C. Expect roughly 13 wet days totalling 70.2mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Bolton is May–September.
Based on PRESTON MOOR PARK, UK (27.7km), 1995–2024. 23 years of May data.