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September Weather in Harlem, United States

Last updated: June 24, 2025

In September, the average temperature in Harlem, United States hovers around 28°C (83°F), providing a warm climate. Daily temperatures range from a comfortable minimum of 21°C (71°F) to a sizzling maximum of 34°C (94°F). Be prepared for 200 mm (7.9 in) of precipitation over approximately 23 days, and don't forget the high average humidity of 83%, which adds to the tropical feel.

September Temperature in Harlem

In September in Harlem, the average temperature is 28°C (83°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 21°C (71°F). This pleasant climate makes Harlem an ideal destination for travelers seeking warm weather and outdoor activities.

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

The chart illustrates September temperature patterns in Harlem, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlem, September typically has an average temperature of 28°C (83°F), with highs reaching up to 34°C (94°F) and lows dropping to around 21°C (71°F).
JanFebMarAprMayJunJulAugSepOctNovDec667172777982838382807369
Data source: Temperature data for Harlem 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 Harlem

In Harlem in September, the precipitation amount is 200 mm (7.9 in) over the course of 23 days.

September Precipitation Trends in Harlem

The chart displays monthly precipitation patterns in Harlem, 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 Harlem, September typically receives around 200 mm (7.9 inches) of precipitation spread over approximately 23 days.
JanFebMarAprMayJunJulAugSepOctNovDec333621571462442112622001194335
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harlem

In Harlem in September humidity is 83%. With an average temperature of 28°C (83°F), this humidity feels like a warm, sticky blanket wrapping around you, making travel uncomfortable and requiring frequent breaks to hydrate and cool down.

September Average Humidity in Harlem

This chart illustrates the average monthly humidity levels in Harlem, 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 Harlem is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%80%75%68%65%73%77%80%83%83%83%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harlem

In Harlem in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Harlem.

Maximum UV Index Levels in Harlem for September

The chart shows the monthly maximum UV Index (UVI) for Harlem 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 Harlem typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec69101212121212111075
Data source: Harlem 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 Harlem Compares to Other Months

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

This table compares monthly weather conditions in Harlem, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather19°C (66°F)33 mm (1.3 inches)83%high
February Weather22°C (71°F)36 mm (1.4 inches)80%very high
March Weather22°C (72°F)21 mm (0.8 inches)75%very high
April Weather25°C (77°F)57 mm (2.2 inches)68%extreme
May Weather26°C (80°F)146 mm (5.8 inches)65%extreme
June Weather28°C (82°F)243 mm (9.6 inches)73%extreme
July Weather28°C (83°F)211 mm (8.3 inches)77%extreme
August Weather28°C (83°F)262 mm (10.3 inches)80%extreme
September Weather28°C (83°F)200 mm (7.9 inches)83%extreme
October Weather27°C (80°F)119 mm (4.7 inches)83%very high
November Weather23°C (74°F)43 mm (1.7 inches)83%high
December Weather20°C (69°F)35 mm (1.4 inches)84%moderate

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