September in Parsippany averages a daily high of 24.9°C with nights around 12.7°C. Expect roughly 9 wet days totalling 95.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Parsippany is May–June.
Based on BOONTON 1 SE, NJ US (4.5km), 1995–2024. 25 years of September data.