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

September weather forecast and climate
East Hampton, NY

The very tall Montauk Point Lighthouse stands high on a hilly spot overlooking the rocky and pebbly shores of East Hampton in Long Island, New York
The very tall Montauk Point Lighthouse stands high on a hilly spot overlooking the rocky and pebbly shores of East Hampton in Long Island, New York
September, the first month of the autumn, in East Hampton, is also an agreeable month, with average temperature fluctuating between 57.2°F (14°C) and 71.6°F (22°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 77°F (25°C) in August, to a pleasant 71.6°F (22°C). The average low-temperature, in East Hampton, is 57.2°F (14°C).

Rainfall

In East Hampton, New York, during 8 rainfall days, 2" (50mm) of precipitation is typically accumulated. Throughout the year, in East Hampton, New York, there are 120 rainfall days, and 31.9" (810mm) of precipitation is accumulated.

Ocean temperature

In East Hampton, the average seawater temperature in September is 68°F (20°C). For most, swimming in 68°F (20°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).

Daylight

In September, the average length of the day in East Hampton is 12.4h.

Sunshine

The average sunshine in East Hampton, New York, is 8h.

UV index

In East Hampton, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV radiation for the average person.
The daily maximum UV index of 6 interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in East Hampton?

In East Hampton, in September, the average high-temperature is 71.6°F (22°C), and the average low-temperature is 57.2°F (14°C).

How much does it rain in East Hampton in September?

In East Hampton, during September, the rain falls for 8 days and regularly aggregates up to 2" (50mm) of precipitation.

What is the ocean temperature in September in East Hampton?

In East Hampton, the average seawater temperature in September is 68°F (20°C). For most, swimming in 68°F (20°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).

What is the average length of the day in September in East Hampton?

The average length of the day in September is 12.4h.

How long on average sun shines in September in East Hampton?

In East Hampton, the average sunshine in September is 8h.

How high is the UV index in September in East Hampton?

In East Hampton, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - East Hampton, NY
  • Average high temperature in September: 71.6°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in September: 57.2°F

Months with the highest average low temperature are July and August (62.6°F).
The coldest month (with the lowest average low temperature) is January (23°F).

Average rainfall in September - East Hampton, NY
  • Average rainfall in September: 2"

The wettest month (with the highest rainfall) is November (5.5").
The driest month (with the lowest rainfall) is August (0.8").

Average rainfall days in September - East Hampton, NY
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is December (12 days).
Months with the lowest number of rainy days are September and October (8 days).

Average sea temperature in September - East Hampton, NY
  • Average sea temperature in September: 68°F

The best month for swimming (with the highest average sea temperature) is August (72°F).
Coldest months (with the lowest average sea temperature) are February and March (41°F).

Average daylight in September / Average sunshine in September - East Hampton, 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: 8h

Months with most sunshine are May, June and July (Average sunshine: 9h).
Months with least sunshine are November and December (Average sunshine: 5).

Average UV index in September - East Hampton, NY
  • 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).