Weather In New York In September 2024. September weather in manhattan new york, united states. Daily high temperatures decrease by 9°f, from 80°f to 70°f, rarely falling below 61°f or exceeding 87°f.
September begins the transition from summer to fall in new york city, bringing cooler temperatures, falling to 74.8°f (23.8°c). Get the monthly weather forecast for manhattan, ny, including daily high/low, historical averages, to help you plan ahead.