September weather forecast
Shelter Island Heights, NY

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Weather in September

The first month of the autumn, September, is also an agreeable month in Shelter Island Heights, New York, with temperature in the range of an average high of 70.7°F (21.5°C) and an average low of 65.1°F (18.4°C).

Temperature

September's advent presents an average high-temperature of a pleasant 70.7°F (21.5°C), indicating a slight variation from the conditions of the previous month. Nighttime temperature sees a small decrement from daytime highs, dipping to an average of 65.1°F (18.4°C) during September.

Humidity

In September, the average relative humidity is 76%.

Rainfall

September is the month with the least rainfall in Shelter Island Heights. Rain falls for 12.6 days and accumulates 2.17" (55mm) of precipitation.

Snowfall

April through October are months without snowfall.

Ocean temperature

In Shelter Island Heights, New York, the average seawater temperature in September is 68.2°F (20.1°C).
Note: Swimming in 68.2°F (20.1°C) does not offer a pleasant experience for most individuals. The act of controlling one's breathing becomes progressively difficult as the water temperature goes under 69.8°F (21°C).

Daylight

The average length of the day in September in Shelter Island Heights is 12h and 28min.
On the first day of the month, sunrise is at 6:16 am and sunset at 7:21 pm. On the last day of September, in Shelter Island Heights, sunrise is at 6:45 am and sunset at 6:32 pm EDT.

Sunshine

In September, the average sunshine in Shelter Island Heights is 8.8h.

UV index

In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Take precautions - Protection against sunburn is recommended. It's recommended to limit sun exposure when its radiation is at its peak during midday. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure.
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Frequently asked questions

What are September temperatures in Shelter Island Heights?

In September, in Shelter Island Heights, the average high-temperature is 70.7°F (21.5°C), and the average low-temperature is 65.1°F (18.4°C).

What is the average humidity in September in Shelter Island Heights?

The average relative humidity in September is 76%.

What is the driest month in Shelter Island Heights?

The month with the least rainfall is September, when the rain falls for 12.6 days and typically collects 2.17" (55mm) of precipitation.

How many days does it rain in September in Shelter Island Heights?

In Shelter Island Heights, in September, during 12.6 rainfall days, 2.17" (55mm) of precipitation is typically accumulated.

When it does not snow in Shelter Island Heights?

April through October are months without snowfall.

What is the ocean temperature in September in Shelter Island Heights?

In Shelter Island Heights, New York, in September, the average water temperature is 68.2°F (20.1°C). Swimming in 68.2°F (20.1°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Shelter Island Heights have in September?

In September, the average day length is 12h and 28min.

When are sunrise and sunset in September in Shelter Island Heights?

On the first day of September in Shelter Island Heights, New York, sunrise is at 6:16 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:32 pm EDT.

How long on average sun shines in September in Shelter Island Heights?

The average sunshine duration in September in Shelter Island Heights is 8.8h.

How high is the UV index in September in Shelter Island Heights?

In Shelter Island Heights, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe 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
Shelter Island Heights, NY

Average temperature in September - Shelter Island Heights, NY
  • Average high temperature in September: 70.7°F

The warmest month (with the highest average high temperature) is August (75.9°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in September: 65.1°F

The month with the highest average low temperature is August (71.2°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).

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Average pressure in September
Shelter Island Heights, NY

Average pressure in September - Shelter Island Heights, NY
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Shelter Island Heights, NY

Average wind speed in September - Shelter Island Heights, NY
  • Average wind speed in September: 12.4mph

The windiest month (with the highest average wind speed) is January (16mph).
The calmest month (with the lowest average wind speed) is July (10.4mph).

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Average humidity in September
Shelter Island Heights, NY

Average humidity in September - Shelter Island Heights, NY
  • Average humidity in September: 76%

The months with the highest relative humidity are May and June (81%).
The month with the lowest relative humidity is November (72%).

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Average rainfall in September
Shelter Island Heights, NY

Average rainfall in September - Shelter Island Heights, NY
  • Average rainfall in September: 2.17"

The wettest month (with the highest rainfall) is December (3.82").
The driest month (with the least rainfall) is September (2.17").

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Average rainfall days in September
Shelter Island Heights, NY

Average rainfall days in September - Shelter Island Heights, NY
  • Average rainfall days in September: 12.6 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (9.1 days).

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Average snowfall in September
Shelter Island Heights, NY

Average snowfall in September - Shelter Island Heights, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (2.36").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Shelter Island Heights, NY

Average snowfall days in September - Shelter Island Heights, NY
  • Average snowfall days in September: 0 days

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

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Average sea temperature in September
Shelter Island Heights, NY

Average sea temperature in September - Shelter Island Heights, NY
  • Average sea temperature in September: 68.2°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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Average daylight in September /
Average sunshine in September
Shelter Island Heights, NY

Average daylight in September / Average sunshine in September - Shelter Island Heights, 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: 8h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).

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Average sunshine days in September
Shelter Island Heights, NY

Average sunshine days in September - Shelter Island Heights, NY
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (16.8 days).
The month with the least sunshine days is February (12.8 days).

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Average UV index in September
Shelter Island Heights, NY

Average UV index in September - Shelter Island Heights, 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
Shelter Island Heights, NY

Average cloud cover in September - Shelter Island Heights, NY
  • Average cloud cover in September: 33

The month with the most cloud cover is December (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
Shelter Island Heights, NY

Average visibility in September - Shelter Island Heights, 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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Shelter Island Heights, New York, USA

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