September weather forecast and climate
Barnum Island, NY

Weather in September

September, the first month of the autumn, in Barnum Island, is still a pleasant month, with average temperature ranging between max 72.3°F (22.4°C) and min 65.3°F (18.5°C).

Temperature

In September, the average high-temperature marginally drops, from a warm 78.4°F (25.8°C) in August, to a pleasant 72.3°F (22.4°C). In September, the average low-temperature is 65.3°F (18.5°C).

Humidity

In September, the average relative humidity in Barnum Island is 75%.

Rainfall

In Barnum Island, New York, in September, it is raining for 13.8 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, there are 159.2 rainfall days, and 37.17" (944mm) of precipitation is accumulated.

Snowfall

May through September are months without snowfall.

Ocean temperature

In Barnum Island, New York, the average seawater temperature is 70.2°F (21.2°C).
Note: 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).

Daylight

In Barnum Island, the average length of the day is 12.4h.

Sunshine

The average sunshine in September is 9h.

UV index

The average daily maximum UV index in Barnum Island is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the temperature in September in Barnum Island?

The average high-temperature, in September, in Barnum Island, is 72.3°F (22.4°C), while the average low-temperature is 65.3°F (18.5°C).

What is the average humidity in September in Barnum Island?

In September, the average relative humidity is 75%.

How much does it rain in Barnum Island in September?

In Barnum Island, New York, in September, it is raining for 13.8 days, with typically 2.68" (68mm) of accumulated precipitation.

Does it snow in Barnum Island in September?

In Barnum Island, New York, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Barnum Island?

In Barnum Island snow does not fall in May through September.

What is the ocean temperature in September in Barnum Island?

In September, the average ocean temperature 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).

What is the average length of the day in September in Barnum Island?

In Barnum Island, New York, the average length of the day in September is 12.4h.

How many hours of sunshine does Barnum Island have in September?

The average sunshine in September in Barnum Island, New York, is 9h.

How high is the UV index in September in Barnum Island?

The average daily maximum UV index in September in Barnum Island, New York, is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV rays.

Average temperature in September
Barnum Island, NY

Average temperature in September - Barnum Island, NY
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (37.8°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 (29.7°F).

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Average pressure in September
Barnum Island, NY

Average pressure in September - Barnum Island, NY
  • Average pressure in September: 30.05"

The month with the highest atmospheric pressure is November (30.1").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in September
Barnum Island, NY

Average wind speed in September - Barnum Island, NY
  • Average wind speed in September: 10.2mph

The windiest month (with the highest average wind speed) is January (13.6mph).
The calmest month (with the lowest average wind speed) is July (8.9mph).

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Average humidity in September
Barnum Island, NY

Average humidity in September - Barnum Island, NY
  • Average humidity in September: 75%

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

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Average rainfall in September
Barnum Island, NY

Average rainfall in September - Barnum Island, NY
  • Average rainfall in September: 2.68"

The wettest month (with the highest rainfall) is July (4.17").
The driest month (with the least rainfall) is January (2.17").

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Average rainfall days in September
Barnum Island, NY

Average rainfall days in September - Barnum Island, NY
  • Average rainfall days in September: 13.8 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in September
Barnum Island, NY

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

The month with the highest snowfall is March (1.5").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in September
Barnum Island, NY

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

Months with the highest number of snowfall days are January and February (4.5 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Barnum Island, NY

Average sea temperature in September - Barnum Island, 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).

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Average daylight in September /
Average sunshine in September
Barnum Island, NY

Average daylight in September / Average sunshine in September - Barnum Island, NY
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 9h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days in September
Barnum Island, NY

Average sunshine days in September - Barnum Island, NY
  • Average sunshine days in September: 15 days

The month with the most sunshine days is November (19.1 days).
The month with the least sunshine days is July (10.7 days).

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Average UV index in September
Barnum Island, NY

Average UV index in September - Barnum Island, NY
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March and December (UV index 2).

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Average cloud cover in September
Barnum Island, NY

Average cloud cover in September - Barnum Island, NY
  • Average cloud cover in September: 32

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
Barnum Island, NY

Average visibility in September - Barnum Island, NY
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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