January weather forecastNaples, Italy

A distant view of Mount Vesuvius, from Naples in Italy, with a beautiful blue waterfront

January

Weather in January

Coming off from the relatively wet December, January in Naples, Italy carries forward a similar weather pattern. As in December, rainfall is high, measuring 67mm (2.64"), and humidity is substantial, contributing to the generally damp conditions of winter. This is also one of the coldest months of the year, with temperatures that rarely climb beyond the mid-teens. The winter sea breeze stirs up wind gusts reaching a notable 20.4km/h (12.7mph). Esteemed as a period of tranquility, Naples experiences its longest nights and shortest days during this month.

Temperature

January, known for its average high temperature of 12.3°C (54.1°F) and an average low temperature of 7.8°C (46°F), is the coldest month.

Humidity

The months with the highest humidity in Naples are January and November, with an average relative humidity of 73%.

Rainfall

In Naples, Italy, in January, it is raining for 15.4 days, with typically 67mm (2.64") of accumulated precipitation. In Naples, during the entire year, the rain falls for 139.4 days and collects up to 569mm (22.4") of precipitation.

Snowfall

Months with snowfall are January and February. The months with the most snowfall are January and February, with an average 2mm (0.08") of accumulated snow.

Sea temperature

In January, the average sea temperature is 14.6°C (58.3°F).
Note: In 14.6°C (58.3°F), even brief exposure to 13°C (55.4°F) feels biting, and anything less than 10°C (50°F) risks cold shock and impaired breathing, considering one's health.

Daylight

In January, the average length of the day is 9h and 38min.
On the first day of the month, sunrise is at 07:27 and sunset at 16:45. On the last day of January, in Naples, sunrise is at 07:14 and sunset at 17:18 CET.

Sunshine

January has the least sunshine of the year in Naples, with an average of 5.6h of sunshine.

UV index

The months with the lowest UV index in Naples, Italy, are January, February and December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In January, a regular UV index of 3 translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Around midday, solar radiation is most harmful; hence, exposure should be limited. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.

Updated: Jan 30, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

January stands out as Naples's coldest month, with an average high-temperature of 12.3°C (54.1°F) and a low-temperature of 7.8°C (46°F).

Naples in January has an average high-temperature of 12.3°C (54.1°F) and an average low-temperature of 7.8°C (46°F).

January and November, with an average relative humidity of 73%, are most humid months in Naples, Italy.

The average relative humidity in January in Naples, Italy, is 73%.

In January, in Naples, the rain falls for 15.4 days. Throughout January, 67mm (2.64") of precipitation is accumulated.

The months with the most snowfall are January and February, with an average 2mm (0.08") of accumulated snow.

January is the first month it typically snows in Naples, Italy. Throughout January, in the average 0.4 snowfall days, it receives 2mm (0.08") of snow.

In Naples, in January, the average water temperature is 14.6°C (58.3°F). At temperatures below 10°C (50°F), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 13°C (55.4°F) is not comfortable.

The average day length in January in Naples, Italy, is 9h and 38min.

On the first day of January, sunrise is at 07:27 and sunset at 16:45. On the last day of the month, sunrise is at 07:14 and sunset at 17:18 CET.

With an average of 5.6h of sunshine, January has the least sunshine of the year in Naples, Italy.

In January, the average sunshine duration is 5.6h.

The months with the lowest UV index are January, February and December, with an average maximum UV index of 3.

The average daily maximum UV index in January is 3. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

13.6°C

12.3°C

12.6°C

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

14.1km/h

14.4km/h

15.1km/h

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

0.4

Average sea temperature

Average daylight

Average sunshine

Average sunshine days

14.9

12.6

11.1

Average UV index

Average cloud cover

Average visibility

Average temperature in January
Naples, Italy

Average high temperature in January: 12.3°C

The warmest month (with the highest average high temperature) is August (30°C).
The month with the lowest average high temperature is January (12.3°C).

Average low temperature in January: 7.8°C

The month with the highest average low temperature is August (22.7°C).
The coldest months (with the lowest average low temperature) are January and February (7.8°C).

Average pressure in January
Naples, Italy

Average pressure in January: 1016.2mbar

The month with the highest atmospheric pressure is December (1018.4mbar).
The month with the lowest atmospheric pressure is April (1014mbar).

Average wind speed in January
Naples, Italy

Average wind speed in January: 13.4km/h

The windiest month (with the highest average wind speed) is February (13.9km/h).
The calmest month (with the lowest average wind speed) is August (8.7km/h).

Average humidity in January
Naples, Italy

Average humidity in January: 73%

The months with the highest relative humidity are January and November (73%).
The month with the lowest relative humidity is August (61%).

Average rainfall in January
Naples, Italy

Average rainfall in January: 67mm

The wettest month (with the highest rainfall) is November (114mm).
The driest month (with the least rainfall) is August (8mm).

Average rainfall days in January
Naples, Italy

Average rainfall days in January: 15.4 days

The month with the highest number of rainy days is January (15.4 days).
The months with the least rainy days are July and August (5.2 days).

Average snowfall in January
Naples, Italy

Average snowfall in January: 2mm

The months with the highest snowfall are January and February (2mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).

Average snowfall days in January
Naples, Italy

Average snowfall days in January: 0.4 days

The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are March, April, May, June, July, August, September, October, November and December (0 days).

Average sea temperature in January
Naples, Italy

Average sea temperature in January: 14.6°C

The best month for swimming (with the highest average sea temperature) is August (26°C).
The coldest month (with the lowest average sea temperature) is February (13.9°C).

Average daylight in January /
Average sunshine in January
Naples, Italy

Average daylight in January: 9h and 36min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

Average sunshine in January: 5h and 36min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).

Average sunshine days in January
Naples, Italy

Average sunshine days in January: 12.6 days

The month with the most sunshine days is July (24 days).
The month with the least sunshine days is February (11.1 days).

Average UV index in January
Naples, Italy

Average UV index in January: 3

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).

Average cloud cover in January
Naples, Italy

Average cloud cover in January: 41

The month with the most cloud cover is January (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 9).

Average visibility in January
Naples, Italy

Average visibility in January: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).