New York
New York, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
New York, NY

The sunset view over New York city skyscrapers in New York, with the dramatic night sky
The sunset view over New York city skyscrapers in New York, with the dramatic night sky
September in New York experiences fluctuating weather, as it transitions into the autumn season. The temperatures read between 60.8°F (16°C) and 75.2°F (24°C), making it a pleasantly warm month. Touring the magnificent New York on foot becomes lovelier and may extend well into the evening. The first week may feel warmer, but the temperatures decrease with the passing of days as autumn takes form.
The ocean remains refreshing to swim in throughout September, with the temperatures averaging 69.8°F (21°C). The humidity remains moderate to allow for more outdoor activities even in the warmest days in September.
Rainfall is moderately higher with an average precipitation of 4.1" (104.1mm). The total average rainfall days are ten, but the downpour may be high, causing minor thunderstorms and floods in some parts of New York City.
There is a slight reduction in the average sunshine hours to nine per day. The sun remains mildly warm throughout September and makes the early nights cold and tolerable. The daytimes are longer and the nights shorter.
  • Average high temperature in September: 75.2°F

The warmest month (with the highest average high temperature) is July (84.1°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (68.8°F).
The coldest month (with the lowest average low temperature) is January (26.9°F).

  • Average humidity in September: 67.8%

The month with the highest relative humidity is September (67.8%).
The month with the lowest relative humidity is April (55.3%).

  • Average rainfall in September: 4.3"

The wettest month (with the highest rainfall) is July (4.6").
The driest month (with the lowest rainfall) is February (3.1").

  • Average rainfall days in September: 8.7 days

The month with the highest number of rainy days is April (11.5 days).
The month with the lowest number of rainy days is September (8.7 days).

  • Average snowfall in September: 0"

The month with the highest snowfall is February (9.2").
Months with the lowest snowfall are May, June, July, August, September and October (0").

  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

  • Average sea temperature in September: 70.1°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 7.3h

Months with most sunshine are July and August (Average sunshine: 8.7h).
The month with least sunshine is December (Average sunshine: 4.5h).

  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 1).

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