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

September weather forecast and Climate
New York, NY

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 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 of the average sunshine hours to nine per day. The sun remains mildly warm throughout September and makes the early nights cool and tolerable. The daytimes are longer and the nights shorter.
  • The average high temperature in September: 24°C

The warmest month (with the highest average high temperature) is July (28.9°C).
The month with the lowest average high temperature is January (3.5°C).

  • The average low temperature in September: 16°C

The month with the highest average low temperature is July (20.4°C).
The coldest month (with the lowest average low temperature) is January (-2.8°C).

  • The 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%).

  • The average rainfall in September: 108.7mm

The wettest month (with the highest rainfall) is July (116.8mm).
The driest month (with the lowest rainfall) is February (78.5mm).

  • The 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).

  • The average snowfall in September: 0mm

The month with the highest snowfall is February (233.7mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

  • The 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).

  • The average sea temperature in September: 20°C

The best month for swimming (with the highest average sea temperature) is August (23°C).
Coldest months (with the lowest average sea temperature) are February and March (5°C).

  • The average daylight in September: 12h

Months with the longest days are June and July (Average daylight: 15h).
The month with shortest days is December (Average daylight: 9h).

  • The 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).

  • The 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).