September Weather in Harlem, United States

Last updated: June 24, 2025

In Harlem, United States, the average temperature in September hovers around 15°C (59°F), with a minimum dipping to -1°C (30°F) and a maximum peaking at 35°C (95°F). Expect 43 mm (1.7 in) of precipitation spread over 5 days, and a comfortable average humidity of 65%. Enjoy the diverse weather as it brings its own charm to the month!

September Temperature in Harlem

In September in Harlem, the average temperature is 15°C (59°F). Maximum temperatures can reach 35°C (95°F), while minimums can drop as low as -1°C (30°F). It's advisable to pack for a wide range of weather conditions to fully enjoy your travels in this diverse climate.

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 15°C (59°F), with highs reaching up to 35°C (95°F) and lows dropping to around -1°C (30°F).

Data source: Temperature data for Harlem generated using information from the Copernicus Climate Change Service.

September Precipitation in Harlem

In Harlem in September, the precipitation amount is 43 mm (1.7 in) over the course of 5 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 43 mm (1.7 inches) of precipitation spread over approximately 5 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Harlem

In Harlem in September humidity is 65%. With an average temperature of 15°C (59°F), this humidity feels like a pleasantly mild atmosphere, making it ideal for exploring the city, though occasional warmth might prompt you to seek shade during midday.

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 65%, offering insight into how humid the weather typically is during this month.

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 is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, 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 7, which falls under the high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	11 mm (0.4 inches)	85%	low
February Weather	-9°C (16°F)	26 mm (1.0 inches)	90%	moderate
March Weather	-1°C (31°F)	22 mm (0.9 inches)	82%	moderate
April Weather	5°C (41°F)	26 mm (1.0 inches)	73%	high
May Weather	12°C (55°F)	38 mm (1.5 inches)	73%	very high
June Weather	18°C (65°F)	49 mm (1.9 inches)	72%	very high
July Weather	22°C (73°F)	10 mm (0.4 inches)	74%	very high
August Weather	21°C (69°F)	28 mm (1.1 inches)	71%	very high
September Weather	15°C (59°F)	43 mm (1.7 inches)	65%	high
October Weather	6°C (44°F)	24 mm (0.9 inches)	68%	moderate
November Weather	0°C (33°F)	28 mm (1.1 inches)	81%	moderate
December Weather	-4°C (25°F)	19 mm (0.8 inches)	89%	low