January Weather in Naples, United States

Last updated: June 24, 2025

In January, the average temperature in Naples, United States hovers around -6°C (21°F), with temperatures dipping as low as -26°C (-14°F) and reaching a maximum of 7°C (46°F). Expect a precipitation total of 26 mm (1.0 in) over 6 days, contributing to an impressive average humidity of 92%. Bundle up and prepare for a chilly yet atmospheric experience!

January Temperature in Naples

In January in Naples, the average temperature is -6°C (21°F). Maximums can reach 7°C (46°F), while minimums can drop as low as -26°C (-14°F). Travelers should be prepared for cold weather and pack accordingly.

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 -6°C (21°F), with highs reaching up to 7°C (46°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 26 mm (1.0 in) over the course of 6 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 26 mm (1.0 inches) of precipitation spread over approximately 6 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Naples

In Naples in January humidity is 92%. With an average temperature of -6°C (21°F), this humidity feels like an icy blanket that clings to your skin, making the cold air feel even more biting and heavy, which can be quite challenging for traveling.

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 92%, 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	-6°C (21°F)	26 mm (1.0 inches)	92%	moderate
February Weather	-4°C (25°F)	38 mm (1.5 inches)	93%	high
March Weather	2°C (37°F)	40 mm (1.6 inches)	85%	very high
April Weather	8°C (46°F)	31 mm (1.2 inches)	73%	very high
May Weather	14°C (57°F)	33 mm (1.3 inches)	64%	extreme
June Weather	21°C (70°F)	17 mm (0.7 inches)	57%	extreme
July Weather	25°C (77°F)	11 mm (0.4 inches)	45%	extreme
August Weather	23°C (73°F)	18 mm (0.7 inches)	41%	extreme
September Weather	18°C (64°F)	19 mm (0.8 inches)	50%	very high
October Weather	8°C (46°F)	35 mm (1.4 inches)	70%	high
November Weather	3°C (37°F)	22 mm (0.9 inches)	84%	moderate
December Weather	-4°C (25°F)	28 mm (1.1 inches)	90%	moderate