May in Manhattan averages a daily high of 24.8°C with nights around 11.6°C. Expect roughly 13 wet days totalling 140.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Manhattan is September–October.
Based on MANHATTAN, KS US (1.7km), 1995–2024. 29 years of May data.