May in Trenton averages a daily high of 22.6°C with nights around 11.1°C. Expect roughly 12 wet days totalling 99.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Trenton is May–June.
Based on TRENTON MERCER AIRPORT, NJ US (9.1km), 1995–2024. 27 years of May data.