October in Trenton averages a daily high of 18.9°C with nights around 8.2°C. Expect roughly 9.7 wet days totalling 95.4mm. 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 October data.