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.
  • Average high temperature in September: 75.2°F

Warmest month (with highest average high temperature) is July (84.1°F).
Month with lowest average high temperature is January (38.3°F).

  • Average low temperature in September: 60.8°F

Month with highest average low temperature is July (68.8°F).
Coldest month (with lowest average low temperature) is January (26.9°F).

  • Average humidity in September: 67.8%

Month with highest relative humidity is September (67.8%).
Month with lowest relative humidity is April (55.3%).

  • Average rainfall in September: 4.3"

Wettest month (with highest rainfall) is July (4.6").
Driest month (with lowest rainfall) is February (3.1").

  • Average rainfall days in September: 8.7 days

Month with highest number of rainy days is April (11.5 days).
Month with lowest number of rainy days is September (8.7 days).

  • Average snowfall in September: 0"

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

  • Average snowfall days in September: 0 days

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

  • Average sea temperature in September: 68°F

Best month for swimming (with highest average sea temperature) is August (73°F).
Coldest months (with lowest average sea temperature) are February and March (41°F).

  • Average daylight in September: 12h

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

  • Average sunshine in September: 7.3h

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

  • Average UV index in September: 6

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