September in Harlem averages a daily high of 24.7°C with nights around 16.8°C. Expect roughly 8.6 wet days totalling 120.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Harlem is May–June.
Based on NY CITY CENTRAL PARK, NY US (3.8km), 1995–2024. 30 years of September data.