May in Hempstead averages a daily high of 20.4°C with nights around 11.7°C. Expect roughly 12 wet days totalling 92mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Hempstead is August–October.
Based on JFK INTERNATIONAL AIRPORT, NY US (14.3km), 1995–2024. 30 years of May data.