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September Weather in Manhattan, United States

Last updated: June 24, 2025

In September, the average temperature in Manhattan, United States is a pleasant 20°C (68°F), with a minimum of 3°C (39°F) and a maximum of 34°C (94°F). Expect 81 mm (3.2 in) of precipitation over 9 days, contributing to an average humidity of 80%. Enjoy the mild climate and the refreshing atmosphere!

September Temperature in Manhattan

In September in Manhattan, the average temperature is 20°C (68°F). Maximums can reach 34°C (94°F), while minimums can dip to as low as 3°C (39°F). This variation in temperature means travelers should prepare for both warm days and cool nights.

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

The chart illustrates September temperature patterns in Manhattan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Manhattan, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec262840496172767368553934
Data source: Temperature data for Manhattan 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 Manhattan

In Manhattan in September, the precipitation amount is 81 mm (3.2 in) spread over a duration of 9 days.

September Precipitation Trends in Manhattan

The chart displays monthly precipitation patterns in Manhattan, 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 Manhattan, September typically receives around 81 mm (3.2 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec65679312215914311486821386156
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Manhattan

In Manhattan in September, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

September Average Humidity in Manhattan

This chart illustrates the average monthly humidity levels in Manhattan, 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 Manhattan is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Manhattan

In Manhattan 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 Manhattan.

Maximum UV Index Levels in Manhattan for September

The chart shows the monthly maximum UV Index (UVI) for Manhattan 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 Manhattan typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098642
Data source: Manhattan 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 Manhattan Compares to Other Months

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

This table compares monthly weather conditions in Manhattan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)65 mm (2.6 inches)82%moderate
February Weather-2°C (29°F)67 mm (2.6 inches)83%moderate
March Weather4°C (40°F)93 mm (3.7 inches)84%high
April Weather9°C (49°F)122 mm (4.8 inches)85%very high
May Weather16°C (62°F)159 mm (6.3 inches)79%very high
June Weather22°C (72°F)143 mm (5.6 inches)82%very high
July Weather24°C (76°F)114 mm (4.5 inches)80%very high
August Weather23°C (74°F)86 mm (3.4 inches)81%very high
September Weather20°C (68°F)81 mm (3.2 inches)80%very high
October Weather13°C (55°F)138 mm (5.4 inches)82%high
November Weather4°C (40°F)61 mm (2.4 inches)88%moderate
December Weather1°C (34°F)56 mm (2.2 inches)84%low

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