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September Weather in Brooklyn, United States

Last updated: June 24, 2025

In Brooklyn, United States, the average temperature in September hovers around 19°C (66°F), with a range that can dip as low as 3°C (37°F) and soar up to 33°C (92°F). Expect 118 mm (4.6 in) of precipitation spread over 10 days, and a notable average humidity of 79%.

September Temperature in Brooklyn

In September in Brooklyn, the average temperature is 19°C (66°F). Maximums can reach 33°C (92°F) and minimums can be as low as 3°C (37°F). This diverse temperature range makes Brooklyn an ideal destination for travelers looking for a mix of warm and cool weather during their visit.

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 19°C (66°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec222337466071757266523730
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 total precipitation amount is 118 mm (4.6 in) over a span of 10 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 118 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec585460101136119801021181144451
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 79%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, making it feel much warmer than the actual temperature and creating a heavy, sticky atmosphere that can be a bit uncomfortable for traveling.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
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.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
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)57 mm (2.3 inches)85%moderate
February Weather-5°C (24°F)54 mm (2.1 inches)85%moderate
March Weather3°C (37°F)60 mm (2.4 inches)85%high
April Weather8°C (47°F)101 mm (4.0 inches)85%very high
May Weather16°C (60°F)136 mm (5.3 inches)78%very high
June Weather22°C (71°F)119 mm (4.7 inches)80%very high
July Weather24°C (75°F)80 mm (3.2 inches)78%very high
August Weather22°C (72°F)102 mm (4.0 inches)76%very high
September Weather19°C (66°F)118 mm (4.6 inches)79%very high
October Weather11°C (52°F)114 mm (4.5 inches)83%moderate
November Weather3°C (37°F)44 mm (1.7 inches)88%moderate
December Weather-1°C (30°F)51 mm (2.0 inches)81%low

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