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
The first month of the autumn, September, is also a moderately hot month in New York, New York, with temperature in the range of an average low of 62.2°F (16.8°C) and an average high of 74.8°F (23.8°C).

Temperature

In New York, the average high-temperature slightly decreases, from 81.9°F (27.7°C) in August, to a still moderately hot 74.8°F (23.8°C). The average low-temperature, in New York, is 62.2°F (16.8°C).

Humidity

In New York, the average relative humidity is 73%.

Rainfall

In New York, New York, it is raining for 14.3 days, with typically 2.44" (62mm) of accumulated precipitation. In New York, during the entire year, the rain falls for 169 days and collects up to 36.65" (931mm) of precipitation.

Snowfall

May through October are months without snowfall in New York.

Ocean temperature

In New York, the average seawater temperature is 70.2°F (21.2°C).
Note: For swimming, a surface water temperature of 70.2°F (21.2°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In New York, New York, the average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine in New York is 8.9h.

UV index

In New York, New York, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in September in New York?

In New York, in September, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 62.2°F (16.8°C).

What is the average humidity in September in New York?

In New York, the average relative humidity in September is 73%.

How much does it rain in New York in September?

In New York, New York, in September, it is raining for 14.3 days, with typically 2.44" (62mm) of accumulated precipitation.

When it does not snow in New York?

In New York snow does not fall in May through October.

What is the ocean temperature in September in New York?

In September, the average ocean temperature is 70.2°F (21.2°C). For swimming, a surface water temperature of 70.2°F (21.2°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

How many hours of daylight does New York have in September?

In September, the average length of the day in New York is 12.4h.

How many hours of sunshine does New York have in September?

In New York, the average sunshine in September is 8.9h.

How high is the UV index in September in New York?

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.
Average temperature in September - New York, NY
  • Average high temperature in September: 74.8°F

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in September: 62.2°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average humidity in September - New York, NY
  • Average humidity in September: 73%

Months with the highest relative humidity are February and December (76%).
The month with the lowest relative humidity is August (70%).

Average rainfall in September - New York, NY
  • Average rainfall in September: 2.44"

The wettest month (with the highest rainfall) is July (4.02").
The driest month (with the lowest rainfall) is January (2.17").

Average rainfall days in September - New York, NY
  • Average rainfall days in September: 14.3 days

The month with the highest number of rainy days is July (18.5 days).
The month with the lowest number of rainy days is January (9.1 days).

Average snowfall in September - New York, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.64").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average snowfall days in September - New York, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.8 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in September - New York, NY
  • 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 / Average sunshine in September - New York, NY
  • 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: 8.9h

The month with most sunshine is July (Average sunshine: 10.5h).
The month with least sunshine is February (Average sunshine: 4.7h).

Average UV index in September - New York, NY
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).