September weather forecast
Sea Cliff, NY

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Weather in September

September, the first month of the autumn in Sea Cliff, is also a moderately hot month, with temperature in the range of an average low of 63.5°F (17.5°C) and an average high of 73.4°F (23°C).

Temperature

A subtle shift in Sea Cliff's weather is observed as August turns into September, with the average high temperature reducing from 80.4°F (26.9°C) to a still warm 73.4°F (23°C). Sea Cliff reports an average nighttime low-temperature of 63.5°F (17.5°C) in September.

Humidity

In Sea Cliff, the average relative humidity in September is 73%.

Rainfall

The month with the least rainfall is September, when the rain falls for 12.9 days and typically collects 2.4" (61mm) of precipitation.

Snowfall

In Sea Cliff, snow does not fall in May through October.

Ocean temperature

In Sea Cliff, in September, the average water temperature is 70.2°F (21.2°C).
Note: Swimming in 70.2°F (21.2°C) is not pleasurable for most people. Breathing control grows increasingly challenging as the water temperature falls under 69.8°F (21°C).

Daylight

The average length of the day in September is 12h and 27min.
On the first day of September, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:37 pm EDT.

Sunshine

In Sea Cliff, the average sunshine in September is 9h.

UV index

The average daily maximum UV index in September in Sea Cliff is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In September, the maximum UV index of 5 suggests these recommendations:
Guard yourself - Avoiding sunburn is suggested. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Attention! The reflection of both water and sand can increase the intensity of UV rays.
Updated: Jul 24, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

Sea Cliff in September has an average high-temperature of 73.4°F (23°C) and an average low-temperature of 63.5°F (17.5°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is computed to be 86°F (30°C).

What is the average humidity in September?

In September, the average relative humidity is 73%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.9 days and accumulates 2.4" (61mm) of precipitation.

How much does it rain in September?

In Sea Cliff, in September, during 12.9 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

When it does not snow?

May through October are months without snowfall.

What is the ocean temperature in September?

In Sea Cliff, the average seawater temperature in September 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 Sea Cliff have in September?

In Sea Cliff, the average day length in September is 12h and 27min.

When is the sunrise / sunset in September?

On the first day of September, sunrise is at 6:22 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:50 am and sunset at 6:37 pm EDT.

How long on average sun shines in September?

In Sea Cliff, the average sunshine duration in September is 9h.

How high is the UV index in September?

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
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
Sea Cliff, NY

Average temperature in September - Sea Cliff, NY
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in September: 63.5°F

The months with the highest average low temperature are July and August (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.3°F).

Average pressure in September
Sea Cliff, NY

Average pressure in September - Sea Cliff, 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
Sea Cliff, NY

Average wind speed in September - Sea Cliff, NY
  • Average wind speed in September: 8.3mph

The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest month (with the lowest average wind speed) is July (7.3mph).

Average humidity in September
Sea Cliff, NY

Average humidity in September - Sea Cliff, NY
  • Average humidity in September: 73%

The months with the highest relative humidity are February, May and December (75%).
The months with the lowest relative humidity are August and November (71%).

Average rainfall in September
Sea Cliff, NY

Average rainfall in September - Sea Cliff, NY
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is December (4.06").
The driest month (with the least rainfall) is September (2.4").

Average rainfall days in September
Sea Cliff, NY

Average rainfall days in September - Sea Cliff, NY
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (9.3 days).

Average snowfall in September
Sea Cliff, NY

Average snowfall in September - Sea Cliff, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.01").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Sea Cliff, NY

Average snowfall days in September - Sea Cliff, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average sea temperature in September
Sea Cliff, NY

Average sea temperature in September - Sea Cliff, 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 (39.9°F).

Average daylight in September /
Average sunshine in September
Sea Cliff, NY

Average daylight in September / Average sunshine in September - Sea Cliff, NY
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in September
Sea Cliff, NY

Average sunshine days in September - Sea Cliff, NY
  • Average sunshine days in September: 15.2 days

The month with the most sunshine days is November (18 days).
The month with the least sunshine days is July (10.6 days).

Average UV index in September
Sea Cliff, NY

Average UV index in September - Sea Cliff, 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
Sea Cliff, NY

Average cloud cover in September - Sea Cliff, NY
  • Average cloud cover in September: 33

The months with the most cloud cover are February and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 29).

Average visibility in September
Sea Cliff, NY

Average visibility in September - Sea Cliff, 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).

Sea Cliff, New York, USA

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