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September Weather in Brooklyn, United States

Last updated: June 24, 2025

In Brooklyn, United States, the average temperature in September is a pleasant 20°C (68°F). However, you can expect a range, with minimums dipping to 3°C (38°F) and maximums reaching up to 33°C (92°F). During this time, the area receives about 116 mm (4.6 in) of precipitation over 9 days, while the average humidity hovers around 73%, adding a touch of moisture to the air.

September Temperature in Brooklyn

In September, in Brooklyn, the average temperature is 20°C (68°F). Maximum temperatures can reach up to 33°C (92°F), while minimums can drop to as low as 3°C (38°F). This makes Brooklyn an ideal destination for travelers seeking pleasant weather and a chance to experience both warm days and cool nights.

September Weather in Brooklyn: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Brooklyn, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brooklyn, September typically has an average temperature of 20°C (68°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec222339496273767368523830
Data source: Temperature data for Brooklyn generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Brooklyn

In Brooklyn in September, the precipitation amount is 116 mm (4.6 in) spread over 9 days.

September Precipitation Trends in Brooklyn

The chart displays monthly precipitation patterns in Brooklyn, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Brooklyn, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec4450788116713776661161434740
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brooklyn

In Brooklyn in September, humidity is 73%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making outdoor activities somewhat sticky, yet the atmosphere remains pleasant for leisurely strolls and sightseeing.

September Average Humidity in Brooklyn

This chart illustrates the average monthly humidity levels in Brooklyn, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Brooklyn is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%80%77%78%77%81%81%77%73%75%85%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brooklyn

In Brooklyn in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Brooklyn.

Maximum UV Index Levels in Brooklyn for September

The chart shows the monthly maximum UV Index (UVI) for Brooklyn in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Brooklyn typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689111098643
Data source: Brooklyn September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Brooklyn Compares to Other Months

Weather in Brooklyn varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Brooklyn, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Brooklyn, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)44 mm (1.7 inches)78%moderate
February Weather-5°C (23°F)50 mm (2.0 inches)80%moderate
March Weather4°C (39°F)78 mm (3.1 inches)77%high
April Weather9°C (49°F)81 mm (3.2 inches)77%very high
May Weather17°C (62°F)166 mm (6.6 inches)77%very high
June Weather23°C (73°F)137 mm (5.4 inches)81%extreme
July Weather24°C (76°F)76 mm (3.0 inches)81%very high
August Weather23°C (73°F)66 mm (2.6 inches)77%very high
September Weather20°C (68°F)116 mm (4.6 inches)73%very high
October Weather11°C (53°F)142 mm (5.6 inches)75%high
November Weather3°C (38°F)47 mm (1.8 inches)85%moderate
December Weather-1°C (31°F)39 mm (1.6 inches)83%moderate

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