September weather forecast
New York, NY

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The sunset view over skyscrapers in New York City, USA
The sunset view over skyscrapers in New York City, USA

Weather in September

September begins the transition from summer to fall in New York City, bringing cooler temperatures, falling to 74.8°F (23.8°C). September experiences diminished daylight hours and cloud cover compared to August, leading to noticeable differences in weather patterns. This month offers the opportunity to witness the transformation of green landscapes into shades of oranges and yellows, making it a picturesque period. Despite the occasional rainfall, a consistent backdrop of partly clear skies makes for an inviting atmosphere during September. The moderate climate also fosters ideal conditions for spending time outdoors.

Temperature

With the onset of September, the average high-temperature subtly recedes from August's 81.9°F (27.7°C) to a still moderately hot 74.8°F (23.8°C). An average nighttime temperature of 62.2°F (16.8°C) is recorded in New York during September.

Humidity

The average relative humidity in September is 73%.

Rainfall

In September, the rain falls for 14.3 days. Throughout September, 2.44" (62mm) of precipitation is accumulated. In New York, 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.

Ocean temperature

In New York, in September, the average water temperature is 70.2°F (21.2°C).
Note: Swimming is not a pleasant activity for most when the water temperature is 70.2°F (21.2°C). As the water temperature drops from 69.8°F (21°C) to 59°F (15°C), breathing becomes more difficult to control.

Daylight

The average length of the day in September in New York is 12h and 27min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:27 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:39 pm EDT.

Sunshine

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

UV index

In New York, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be vigilant! The Sun's UV rays get a boost from sand and water reflections.

Frequently asked questions

What are the temperatures in New York in September?

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). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, in August is appraised at 86°F (30°C).

What is the average humidity in September in New York?

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

How much does it rain in New York in September?

In New York, in September, during 14.3 rainfall days, 2.44" (62mm) of precipitation is typically accumulated.

When it does not snow in New York?

In New York, 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 in New York is 70.2°F (21.2°C). For most, swimming in 70.2°F (21.2°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

In September, the average day length in New York, New York, is 12h and 27min.

What time are sunrise and sunset in September in New York?

On the first day of September, sunrise is at 6:23 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:39 pm EDT.

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

The average sunshine duration in September in New York, New York, is 8.9h.

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

The average daily maximum UV index in September in New York is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
New York, NY

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 pressure in September
New York, NY

Average pressure in September - New York, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
New York, NY

Average wind speed in September - New York, NY
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

Average humidity in September
New York, NY

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

The 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 - 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 least rainfall) is January (2.17").

Average rainfall days in September
New York, NY

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 least rainy days is January (9.1 days).

Average snowfall in September
New York, NY

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

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

Average snowfall days in September
New York, NY

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).
The months with the least 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 - 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 / Average sunshine in September - New York, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in September
New York, NY

Average sunshine days in September - New York, NY
  • Average sunshine days in September: 13.1 days

The month with the most sunshine days is January (17.9 days).
The month with the least sunshine days is June (9.8 days).

Average UV index in September
New York, NY

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

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

Average cloud cover in September
New York, NY

Average cloud cover in September - New York, NY
  • Average cloud cover in September: 34

The months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in September
New York, NY

Average visibility in September - New York, NY
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

New York, New York, USA

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