September weather forecast
Brooklyn, NY

Weather in September

The first month of the autumn, September, is also a moderately hot month in Brooklyn, New York, with temperature in the range of an average high of 73.9°F (23.3°C) and an average low of 63.5°F (17.5°C).

Temperature

In September, the average high-temperature slightly decreases from 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

The average relative humidity in September is 74%.

Rainfall

The month with the least rainfall is September, when the rain falls for 9.6 days and typically collects 0.51" (13mm) of precipitation.

Snowfall

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

Ocean temperature

In September, the average ocean temperature in Brooklyn is 70.2°F (21.2°C).
Note: For swimming, a surface water temperature of 70.2°F (21.2°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

In Brooklyn, the average length of the day in September is 12h and 27min.
On the first day of the month, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of September, in Brooklyn, New York, sunrise is at 6:51 am and sunset at 6:39 pm EDT.

Sunshine

In September, the average sunshine in Brooklyn is 9h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. 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, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 63.5°F (17.5°C). in July, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 86°F (30°C).

What is the average humidity in September in Brooklyn?

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

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.

How much does it rain in Brooklyn in September?

In Brooklyn, in September, it is raining for 9.6 days, with typically 0.51" (13mm) of accumulated precipitation.

When it does not snow in Brooklyn?

May through November are months without snowfall.

What is the ocean temperature in September in Brooklyn?

In Brooklyn, the average seawater temperature in September 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 Brooklyn, New York, the average day length in September is 12h and 27min.

What time are sunrise and sunset in September in Brooklyn?

On the first day of September in Brooklyn, sunrise is at 6:23 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:39 pm EDT.

How many hours of sunshine does Brooklyn have in September?

In September, the average sunshine duration is 9h.

What is the UV index reading in September in Brooklyn?

In September, the average daily maximum UV index in Brooklyn, New York, is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%

The months with the highest relative humidity are February, May and June (76%).
The 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").
The 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

The months with the highest number of snowfall days are January and February (3.6 days).
The 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: 12h and 27min

The month with the longest days is June (Average daylight: 15h and 2min).
The month with the shortest days is December (Average daylight: 9h and 19min).

  • Average sunshine in September: 9h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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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

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, 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

The 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

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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