January Weather in Naples, United States

Last updated: June 24, 2025

In January, the average temperature in Naples, United States hovers around -4°C (25°F). Be prepared for a chilly range, as temperatures can plummet to a minimum of -26°C (-14°F) and rise to a maximum of 16°C (62°F). Expect 75 mm (3.0 in) of precipitation over 12 days, contributing to an average humidity of 91%. Dress warmly and stay dry!

January Temperature in Naples

In January in Naples, the average temperature is -4°C (25°F). Maximum temperatures can reach 16°C (62°F), while minimums can drop as low as -26°C (-14°F). Be prepared for extreme temperature variations and plan accordingly for your travels.

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

The chart illustrates January temperature patterns in Naples, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Naples, January typically has an average temperature of -4°C (25°F), with highs reaching up to 16°C (62°F) and lows dropping to around -26°C (-14°F).

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

January Precipitation in Naples

In Naples in January, the precipitation amount is 75 mm (3.0 in) over the course of 12 days.

January Precipitation Trends in Naples

The chart displays monthly precipitation patterns in Naples, 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 Naples, January typically receives around 75 mm (3.0 inches) of precipitation spread over approximately 12 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 Naples

In Naples in January humidity is 91%. With an average temperature of -4°C (25°F), this humidity feels like a biting chill that penetrates your clothing, making it uncomfortable for traveling as every gust of wind amplifies the cold and dampness in the air.

January Average Humidity in Naples

This chart illustrates the average monthly humidity levels in Naples, 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 Naples is approximately 91%, 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 Naples

In Naples in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Naples, you can check the information here.

Maximum UV Index Levels in Naples for January

The chart shows the monthly maximum UV Index (UVI) for Naples 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 Naples typically reaches 3, which falls under the moderate exposure category.

Data source: Naples 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 Naples Compares to Other Months

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

This table compares monthly weather conditions in Naples, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-4°C (25°F)	75 mm (3.0 inches)	91%	moderate
February Weather	-3°C (27°F)	85 mm (3.4 inches)	91%	moderate
March Weather	1°C (34°F)	76 mm (3.0 inches)	88%	high
April Weather	7°C (45°F)	112 mm (4.4 inches)	88%	very high
May Weather	14°C (57°F)	126 mm (5.0 inches)	82%	very high
June Weather	19°C (66°F)	106 mm (4.2 inches)	79%	very high
July Weather	21°C (71°F)	144 mm (5.7 inches)	77%	very high
August Weather	20°C (69°F)	87 mm (3.4 inches)	72%	very high
September Weather	17°C (62°F)	86 mm (3.4 inches)	76%	very high
October Weather	11°C (52°F)	138 mm (5.4 inches)	83%	high
November Weather	3°C (37°F)	84 mm (3.3 inches)	88%	moderate
December Weather	-1°C (30°F)	88 mm (3.5 inches)	87%	low