September weather forecast
West Sayville, NY

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Weather in September

The first month of the autumn, September, is also an agreeable month in West Sayville, New York, with an average temperature fluctuating between 65.3°F (18.5°C) and 72.1°F (22.3°C).

Temperature

With the onset of September, the average high-temperature subtly recedes from August's warm 78.1°F (25.6°C) to a pleasant 72.1°F (22.3°C). West Sayville records a slight downturn in temperature to an average of 65.3°F (18.5°C) during September nights.

Humidity

The average relative humidity in September is 74%.

Rainfall

In West Sayville, during September, the rain falls for 12.8 days and regularly aggregates up to 2.48" (63mm) of precipitation. In West Sayville, during the entire year, the rain falls for 155.3 days and collects up to 34.84" (885mm) of precipitation.

Snowfall

April, June through September and November are months without snowfall.

Ocean temperature

In West Sayville, in September, the average water temperature is 69.6°F (20.9°C).
Note: When the surface water temperature is 69.6°F (20.9°C), most do not enjoy swimming. Breathing control becomes more complex as temperatures drop below 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 6:20 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.

Sunshine

In September, the average sunshine is 9.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: The maximum UV index, 5 during September, leads to the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Updated: Jun 11, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are September temperatures?

In September, the average high-temperature and low-temperature are 72.1°F (22.3°C) and 65.3°F (18.5°C) respectively.

What is the average humidity in September in West Sayville?

In September, the average relative humidity in West Sayville is 74%.

How much does it rain in September?

In West Sayville, in September, it is raining for 12.8 days, with typically 2.48" (63mm) of accumulated precipitation.

When it does not snow?

In West Sayville, New York, snow does not fall in April, June through September and November.

Does it snow in September?

In West Sayville, in September, it doesn't snow. In October, it regularly snows.

How cold is the water in September?

In West Sayville, in September, the average water temperature is 69.6°F (20.9°C). For most, swimming in 69.6°F (20.9°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 September, the average day length is 12h and 27min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:35 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 9.2h.

How high is the UV index in September?

In West Sayville, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
West Sayville, NY

Average temperature in September - West Sayville, NY
  • Average high temperature in September: 72.1°F

The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is August (71.8°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).

Average pressure in September
West Sayville, NY

Average pressure in September - West Sayville, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in September
West Sayville, NY

Average wind speed in September - West Sayville, NY
  • Average wind speed in September: 10.4mph

The windiest month (with the highest average wind speed) is January (13.8mph).
The calmest months (with the lowest average wind speed) are July and August (9mph).

Average humidity in September
West Sayville, NY

Average humidity in September - West Sayville, NY
  • Average humidity in September: 74%

The months with the highest relative humidity are May and June (78%).
The month with the lowest relative humidity is November (71%).

Average rainfall in September
West Sayville, NY

Average rainfall in September - West Sayville, NY
  • Average rainfall in September: 2.48"

The wettest month (with the highest rainfall) is December (3.74").
The driest month (with the least rainfall) is January (2.17").

Average rainfall days in September
West Sayville, NY

Average rainfall days in September - West Sayville, NY
  • Average rainfall days in September: 12.8 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).

Average snowfall in September
West Sayville, NY

Average snowfall in September - West Sayville, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.13").
The months with the least snowfall are April, June, July, August, September and November (0").

Average snowfall days in September
West Sayville, NY

Average snowfall days in September - West Sayville, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in September
West Sayville, NY

Average sea temperature in September - West Sayville, NY
  • Average sea temperature in September: 69.6°F

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

Average daylight in September /
Average sunshine in September
West Sayville, NY

Average daylight in September / Average sunshine in September - West Sayville, 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: 9h and 1min

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

Average sunshine days in September
West Sayville, NY

Average sunshine days in September - West Sayville, NY
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is November (18.8 days).
The month with the least sunshine days is July (11.3 days).

Average UV index in September
West Sayville, NY

Average UV index in September - West Sayville, 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 and December (UV index 2).

Average cloud cover in September
West Sayville, NY

Average cloud cover in September - West Sayville, NY
  • Average cloud cover in September: 31

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in September
West Sayville, NY

Average visibility in September - West Sayville, 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).

West Sayville, New York, USA

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