May in Parsippany averages a daily high of 22°C with nights around 9.9°C. Expect roughly 12.8 wet days totalling 111.8mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Parsippany is May–June.
Based on BOONTON 1 SE, NJ US (4.5km), 1995–2024. 23 years of May data.