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September Weather in Manhattan, United States

Last updated: June 24, 2025

In Manhattan, United States, the average temperature for September is a mild 14°C (57°F). However, prepare for a range of weather, as temperatures can dip as low as -2°C (28°F) and soar up to 35°C (95°F). Rainfall averages 47 mm (1.8 in) over 7 days, creating a 67% average humidity, so be ready for a mix of sun and showers!

September Temperature in Manhattan

In September in Manhattan, the average temperature is 14°C (57°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as -2°C (28°F). Be prepared for a wide range of temperatures during your travels, from warm days to chilly 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 14°C (57°F), with highs reaching up to 35°C (95°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec211931384959686656403023
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 47 mm (1.8 in) during a span of 7 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 47 mm (1.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec245036708286263447523730
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 67%. With an average temperature of 14°C (57°F), this humidity feels like a cool, refreshing mist that invigorates your senses, making it quite pleasant for traveling, though a light jacket is recommended as the moisture in the air can create a brisk atmosphere.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%90%83%79%76%74%69%67%72%89%94%
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.
JanFebMarAprMayJunJulAugSepOctNovDec3578111110108642
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-6°C (22°F)24 mm (0.9 inches)93%moderate
February Weather-7°C (19°F)50 mm (2.0 inches)92%moderate
March Weather0°C (31°F)36 mm (1.4 inches)89%high
April Weather3°C (38°F)70 mm (2.8 inches)83%very high
May Weather9°C (49°F)82 mm (3.2 inches)79%extreme
June Weather15°C (60°F)86 mm (3.4 inches)76%extreme
July Weather20°C (68°F)26 mm (1.0 inches)74%very high
August Weather19°C (66°F)34 mm (1.3 inches)69%very high
September Weather14°C (57°F)47 mm (1.8 inches)67%very high
October Weather4°C (40°F)52 mm (2.0 inches)72%high
November Weather-1°C (31°F)37 mm (1.5 inches)89%moderate
December Weather-5°C (23°F)30 mm (1.2 inches)94%low

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