January Weather in Harlem, United States

Last updated: June 24, 2025

In Harlem, United States, the average temperature in January hovers around 19°C (66°F), with minimums dipping to 3°C (38°F) and maximums soaring to 30°C (86°F). Expect a total precipitation of 33 mm (1.3 in) spread across 4 days, contributing to an average humidity level of 83%. Stay prepared for a blend of warmth and moisture this month!

January Temperature in Harlem

In January in Harlem, the average temperature is 19°C (66°F), with maximums reaching 30°C (86°F) and minimums dropping as low as 3°C (38°F). This makes it an ideal time for travelers who enjoy mild weather and the potential for warm sunny days.

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

The chart illustrates January 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, January typically has an average temperature of 19°C (66°F), with highs reaching up to 30°C (86°F) and lows dropping to around 3°C (38°F).

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

January Precipitation in Harlem

In Harlem in January, the precipitation amount is 33 mm (1.3 in) over a span of 4 days.

January Precipitation Trends in Harlem

The chart displays monthly precipitation patterns in Harlem, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Harlem, January typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 4 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

January Humidity in Harlem

In Harlem in January, humidity is 83%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making travel feel more sluggish and muggy, yet there's a refreshing coolness in the air that invites you to explore.

January Average Humidity in Harlem

This chart illustrates the average monthly humidity levels in Harlem, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Harlem is approximately 83%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Harlem

In Harlem in January, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Harlem, you can refer to this Hourly UV Index in Harlem.

Maximum UV Index Levels in Harlem for January

The chart shows the monthly maximum UV Index (UVI) for Harlem in January, 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 January, the maximum UV index in Harlem typically reaches 6, which falls under the high exposure category.

Data source: Harlem January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	19°C (66°F)	33 mm (1.3 inches)	83%	high
February Weather	22°C (71°F)	36 mm (1.4 inches)	80%	very high
March Weather	22°C (72°F)	21 mm (0.8 inches)	75%	very high
April Weather	25°C (77°F)	57 mm (2.2 inches)	68%	extreme
May Weather	26°C (80°F)	146 mm (5.8 inches)	65%	extreme
June Weather	28°C (82°F)	243 mm (9.6 inches)	73%	extreme
July Weather	28°C (83°F)	211 mm (8.3 inches)	77%	extreme
August Weather	28°C (83°F)	262 mm (10.3 inches)	80%	extreme
September Weather	28°C (83°F)	200 mm (7.9 inches)	83%	extreme
October Weather	27°C (80°F)	119 mm (4.7 inches)	83%	very high
November Weather	23°C (74°F)	43 mm (1.7 inches)	83%	high
December Weather	20°C (69°F)	35 mm (1.4 inches)	84%	moderate