September weather forecastBrooklyn, NY
September
Weather in September
September serves as a bearer of mild weather and fall foliage in Brooklyn. It is during this month that the warm summer days gradually transition into cooler nights, marking the onset of autumn. This shift from warmer to cooler temperatures is appreciated by many residents. Clear weather, marked by temperature range from 63.5°F (17.5°C) to 73.9°F (23.3°C), makes September a comfortable month. As the month concludes, autumn arrives in full sway in October.Temperature
September's arrival in Brooklyn signals a moderate reduction in the average high-temperature, easing from a moderately hot 80.2°F (26.8°C) in August to a still warm 73.9°F (23.3°C). The average temperature during September nights is registered at a refreshing 63.5°F (17.5°C).Humidity
The average relative humidity in September in Brooklyn is 74%.Rainfall
September is the month with the least rainfall in Brooklyn, New York. Rain falls for 9.6 days and accumulates 0.51" (13mm) of precipitation.Snowfall
May through November are months without snowfall in Brooklyn.Ocean temperature
In Brooklyn, the average seawater temperature in September is 70.2°F (21.2°C).Note: For most individuals, swimming in 70.2°F (21.2°C) is not a pleasant experience. The difficulty in managing breathing increases as the temperature decreases from 69.8°F (21°C) to 59°F (15°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 7:27 pm. On the last day of September, in Brooklyn, sunrise is at 6:51 am and sunset at 6:39 pm EDT.
Sunshine
In Brooklyn, the average sunshine in September is 9h.UV index
In Brooklyn, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, a daily UV index of 5 turns into the following recommendations:
Take measures. Individuals with light skin might experience burns in under 30 minutes. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Warning! Reflective surfaces like sand and water amplify the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
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).
Average daylight in September /
Average sunshine in September
Brooklyn, NY
- Average daylight in September: 12h and 30min
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 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).
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).
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).
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).
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).
