September weather forecast
East Islip, NY

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Weather in September

September, the first month of the autumn in East Islip, is still a pleasant month, with an average temperature fluctuating between 65.3°F (18.5°C) and 72.1°F (22.3°C).

Temperature

Transitioning from August to September involves a subtle drop in average high-temperatures, descending from a warm 78.4°F (25.8°C) to an agreeable 72.1°F (22.3°C). East Islip registers a subtle dip to an average of 65.3°F (18.5°C) during the nights of September.

Humidity

The average relative humidity in September in East Islip is 74%.

Rainfall

In September, in East Islip, the rain falls for 13.5 days. Throughout September, 2.56" (65mm) of precipitation is accumulated. In East Islip, New York, during the entire year, the rain falls for 153.2 days and collects up to 34.45" (875mm) of precipitation.

Snowfall

In East Islip, snow does not fall in April through September.

Daylight

In September, the average length of the day in East Islip is 12h and 27min.
On the first day of the month, sunrise is at 6:20 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:36 pm EDT.

Sunshine

The average sunshine in September is 9.1h.

UV index

In September, the average daily maximum UV index in East Islip is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a daily UV index of 5 turns into the following recommendations:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
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Frequently asked questions

What is the average September temperature in East Islip?

September temperatures in East Islip vary between a high-temperature of 72.1°F (22.3°C) and a low-temperature of 65.3°F (18.5°C).

What is the average humidity in September in East Islip?

In September, the average relative humidity in East Islip is 74%.

How much does it rain in East Islip in September?

In East Islip, New York, in September, it is raining for 13.5 days, with typically 2.56" (65mm) of accumulated precipitation.

When it does not snow in East Islip?

In East Islip, snow does not fall in April through September.

Does it snow in East Islip in September?

In East Islip, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does East Islip have in September?

In East Islip, the average day length in September is 12h and 27min.

What time are sunrise and sunset in September in East Islip?

On the first day of September in East Islip, 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 6:36 pm EDT.

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

In East Islip, New York, the average sunshine duration in September is 9.1h.

What is the UV index reading in September in East Islip?

The average daily maximum UV index in September in East Islip is 5. A UV Index value of 3 to 5 symbolizes a medium health risk 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
East Islip, NY

Average temperature in September - East Islip, NY
  • Average high temperature in September: 72.1°F

The warmest month (with the highest average high temperature) is July (79°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 (72°F).
The coldest month (with the lowest average low temperature) is January (30°F).

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Average pressure in September
East Islip, NY

Average pressure in September - East Islip, 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).

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Average wind speed in September
East Islip, NY

Average wind speed in September - East Islip, NY
  • Average wind speed in September: 10.1mph

The windiest month (with the highest average wind speed) is January (13.4mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).

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Average humidity in September
East Islip, NY

Average humidity in September - East Islip, NY
  • Average humidity in September: 74%

The months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).

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Average rainfall in September
East Islip, NY

Average rainfall in September - East Islip, NY
  • Average rainfall in September: 2.56"

The wettest month (with the highest rainfall) is July (3.86").
The driest month (with the least rainfall) is January (2.05").

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Average rainfall days in September
East Islip, NY

Average rainfall days in September - East Islip, NY
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.6 days).

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Average snowfall in September
East Islip, NY

Average snowfall in September - East Islip, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.97").
The months with the least snowfall are April, May, June, July, August and September (0").

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Average snowfall days in September
East Islip, NY

Average snowfall days in September - East Islip, NY
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in September /
Average sunshine in September
East Islip, NY

Average daylight in September / Average sunshine in September - East Islip, 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).

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Average sunshine days in September
East Islip, NY

Average sunshine days in September - East Islip, NY
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).

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Average UV index in September
East Islip, NY

Average UV index in September - East Islip, 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).

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Average cloud cover in September
East Islip, NY

Average cloud cover in September - East Islip, 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).

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Average visibility in September
East Islip, NY

Average visibility in September - East Islip, 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).

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East Islip, New York, USA

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