September weather forecast and climate
Brooklyn, NY

Weather in September

The first month of the autumn, September, is still a warm month in Brooklyn, New York, with average temperature fluctuating between 63.5°F (17.5°C) and 73.9°F (23.3°C).

Temperature

In Brooklyn, New York, the average high-temperature in September slightly decreases, from a warm 80.2°F (26.8°C) in August, to a still moderately hot 73.9°F (23.3°C). The average low-temperature, in September, is 63.5°F (17.5°C).

Humidity

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

Rainfall

September is the month with the least rainfall. Rain falls for 9.6 days and accumulates 0.51" (13mm) of precipitation.

Snowfall

In Brooklyn snow does not fall in May through November.

Ocean temperature

In Brooklyn, New York, the average seawater temperature is 70.2°F (21.2°C).
Note: Swimming in 70.2°F (21.2°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In Brooklyn, the average length of the day is 12.4h.

Sunshine

The average sunshine in September is 9h.

UV index

In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of sand and water significantly increases the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in Brooklyn?

In September, in Brooklyn, New York, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 63.5°F (17.5°C).

What is the average humidity in September in Brooklyn?

The average relative humidity in September in Brooklyn, New York, is 74%.

How much does it rain in Brooklyn in September?

In September, in Brooklyn, New York, the rain falls for 9.6 days. Throughout September, 0.51" (13mm) of precipitation is accumulated.

What is the driest month in Brooklyn?

September is the month with the least rainfall. Rain falls for 9.6 days and accumulates 0.51" (13mm) of precipitation.

When it does not snow in Brooklyn?

In Brooklyn, New York, snow does not fall in May through November.

What is the ocean temperature in September in Brooklyn?

In Brooklyn, New York, in September, the average water 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 Brooklyn?

In September, the average length of the day in Brooklyn is 12.4h.

How long on average sun shines in September in Brooklyn?

The average sunshine in September in Brooklyn is 9h.

How high is the UV index in September in Brooklyn?

In Brooklyn, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to the Sun's UV rays.

Average temperature in September
Brooklyn, NY

Average temperature in September - Brooklyn, NY
  • Average high temperature in September: 73.9°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 (37°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

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Average pressure in September
Brooklyn, NY

Average pressure in September - Brooklyn, 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
Brooklyn, NY

Average wind speed in September - Brooklyn, 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 (7.4mph).

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Average humidity in September
Brooklyn, NY

Average humidity in September - Brooklyn, NY
  • Average humidity in September: 74%

Months with the highest relative humidity are February, May and June (76%).
Months with the lowest relative humidity are August and November (72%).

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Average rainfall in September
Brooklyn, NY

Average rainfall in September - Brooklyn, NY
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is July (1.34").
The driest month (with the least rainfall) is September (0.51").

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Average rainfall days in September
Brooklyn, NY

Average rainfall days in September - Brooklyn, NY
  • Average rainfall days in September: 9.6 days

The month with the highest number of rainy days is July (12.9 days).
The month with the least rainy days is January (4.9 days).

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Average snowfall in September
Brooklyn, NY

Average snowfall in September - Brooklyn, NY
  • Average snowfall in September: 0"

The month with the highest snowfall is March (0.55").
Months with the least snowfall are May, June, July, August, September, October and November (0").

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Average snowfall days in September
Brooklyn, NY

Average snowfall days in September - Brooklyn, NY
  • Average snowfall days in September: 0 days

Months with the highest number of snowfall days are January and February (3.6 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
Brooklyn, NY

Average sea temperature in September - Brooklyn, 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
Brooklyn, NY

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

The month with the longest days is June (Average daylight: 15.1h).
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: 10.7h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days in September
Brooklyn, NY

Average sunshine days in September - Brooklyn, NY
  • Average sunshine days in September: 19 days

The month with the most sunshine days is January (22 days).
The month with the least sunshine days is June (16 days).

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Average UV index in September
Brooklyn, NY

Average UV index in September - Brooklyn, 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, November and December (UV index 2).

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Average cloud cover in September
Brooklyn, NY

Average cloud cover in September - Brooklyn, NY
  • Average cloud cover in September: 33

Months with the most cloud cover are February, March and December (Cloud cover 47).
The month with the least cloud cover is August (Cloud cover 28).

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Average visibility in September
Brooklyn, NY

Average visibility in September - Brooklyn, 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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