New York City weather in September 2025

Expect daytime maximum temperatures of 24°C in New York City, New York in September based on long-term weather averages. There are 7 hours of sunshine per day on average with typically 92 mm of rainfall in the month.

  • 24°C maximum daytime temperature in September in New York City24
    24°C max day temperature
  • 7 hours of sunshine per day
  • 8 days with some rainfall in September in New York City8
    8 days with some rainfall
  • 16°C minimum night-time temperature in September in New York City16
    16°C min night temperature
  • 12 hours of daylight per day in September in New York City12
    12 hours of daylight per day
  • No heat & humidity in September in New York City0
    No heat & humidity
  • 92 mm monthly rainfall in September in New York City92
    92 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in New York City6
    6 (High) UV index
  • 21°C sea temperature in September in New York City21
    21°C sea temperature

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