Your January weather guide
CoolWeather in Naples in January
Naples in January suits a city break if you want milder days than London, not a warm-weather holiday. Average daytime highs are 12°C, falling to around 6°C at night, and about 11 rainy days mean waterproofs deserve space in your bag. Go if you are happy walking in cool weather and changing plans when it rains. Choose another month if outdoor dining, swimming or reliably warm afternoons are central to your trip.
Long-term climate averages for Naples, not a forecast · 1991-2020
Naples, month by month
Your snapshot
At a glance
The useful details for Naples.
- Average daytime high
- 12.0°C
- 9 in 10 days stay below 15°C
- Average night-time low
- 5.8°C
- coldest 10% of nights: 2°C or lower
- Compared with London
- +4.6°C
- London averages 7.4°C in January
- Sea temperature
- 15.0°C
- year to year: 15°C to 16°C
- Sunshine per day (est.)
- 4.2h
- 45% of 9.4 h of daylight
- Rainy days (1 mm+)
- 11
- 107 mm over the month
- Humidity
- 79%
- Days over 25°C
- 0%
- none over 30°C
- Record high 1991-2020
- 18.9°C
- 2018-01-08
- Record low 1991-2020
- -3.7°C
- 2017-01-08
- Flight from London
- ≈ 2 h 42 min
- 1594 km, short-haul (estimate for a direct flight)
Records are observed extremes within 1991-2020, not typical holiday conditions. Warm-day percentages are shares of days, not day counts.
How January compares
January is the 12th warmest month of the year in Naples and ranks 104th of 134 destinations we compare for January - see where else is hot in January. Within Italy it is 5th of 16 (Italy in January). Against London's average high of 7.4°C in January, Naples is 4.6°C warmer by day and 3.6°C warmer at night.
Daytime and night-time in January
The typical January day in Naples peaks at 12.0°C, but that is an average: the warmest 10% of days reach 14.5°C or more. Days over 25°C are rare. Nights average 5.8°C; one night in ten drops to 1.6°C or lower, so pack a layer for evenings - it is genuinely cool after dark. Between 1991 and 2020 the hottest January day here reached 18.9°C (2018-01-08) and the coldest night -3.7°C (2017-01-08).
Rain in January
Wet (more than 8 rainy days): about 11 days with 1 mm or more, 107 mm in total. Year to year it varies a lot - the wettest January was 2009 with 298 mm, the driest 2020 with 14 mm. Humidity averages 79%.
Sea temperature in January
The sea averages 15.0°C - too cold for most (under 18°c). Depending on the year it ranges from 14.5°C to 15.5°C. For the warmest sea here, come in August (26.4°C).
Sunshine and daylight
Around 4.2 hours of sunshine a day (estimated from cloud cover), 9.4 hours of daylight: the sun rises about 07:26 and sets about 16:58 local time in mid-January. Average cloud cover is 56%.
Is January a good time to visit Naples?
January is not the strongest month here: cool days and frequent rain. The best months for Naples on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug, Sep.
Milder than London, but still winter
January is Naples's coldest month, so the extra warmth compared with home needs perspective. Its average daytime high is 4.6°C above London's, which can make daytime walks more comfortable, but does not turn it into a summer-clothes trip. Pack layers beneath a warm jacket, with something to protect your neck and hands after dark. The coldest nights can fall to 1.6°C or lower, so a mild afternoon is no reason to leave your coat behind for the evening. Warmer days can reach 14.5°C or more, offering a gentler spell for being outside, but treat those as a bonus rather than the basis of your plans.
Keep outdoor plans flexible
Rain is the main practical catch. With about 11 rainy days, a short stay could include wet weather, so bring a waterproof jacket and shoes that can cope with damp pavements. Leave room to move outdoor plans around rather than tying every day to a fixed schedule. There are about 4.2 hours of sunshine within 9.4 hours of daylight: enough for some brighter time outside, but not a promise of clear afternoons. Use the daylight for walking and keep indoor options available when rain arrives. This is a better fit for travellers comfortable with changeable winter weather than those wanting to spend most of the trip sitting outdoors.
A little perspective
Naples through the year
January is highlighted. See how it compares with the rest of the year.
| Month | Day | Night | Sea | Sun/day | Rain mm | Rainy days | Days 25°C+ |
|---|---|---|---|---|---|---|---|
| JanuarySelected | 12.0°C | 5.8°C | 15.0°C | 4.2 | 107 | 11 | 0% |
| February | 12.4°C | 5.7°C | 14.2°C | 4.9 | 102 | 11 | 0% |
| March | 14.8°C | 7.4°C | 14.1°C | 5.3 | 103 | 11 | 0% |
| April | 17.6°C | 9.8°C | 15.4°C | 6.1 | 96 | 11 | 1% |
| May | 21.7°C | 13.6°C | 18.9°C | 7.6 | 63 | 9 | 15% |
| Junebest | 25.9°C | 17.8°C | 22.8°C | 9.9 | 34 | 6 | 61% |
| Julybest | 28.9°C | 20.6°C | 25.5°C | 11.7 | 19 | 4 | 95% |
| Augustbest | 29.5°C | 21.3°C | 26.4°C | 10.6 | 23 | 4 | 96% |
| September | 25.3°C | 18.0°C | 24.4°C | 7.3 | 90 | 9 | 53% |
| October | 21.2°C | 14.4°C | 21.9°C | 5.5 | 134 | 11 | 6% |
| November | 16.7°C | 10.8°C | 19.3°C | 4.1 | 174 | 13 | 0% |
| December | 13.0°C | 7.1°C | 16.9°C | 4.1 | 134 | 12 | 0% |
Day = average daytime high, night = average night-time low, 1991-2020.Sun is hours per day; rainy days count 1 mm or more.
Day, night and sea
Monthly average temperatures, 1991-2020
- Day
- Night
- Sea
Best months here
On warmth, low rainfall and sunshine, start with these.
Keep exploring
Similar in January
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Naples in January FAQs
Plain answers, grounded in the averages.
Is Naples hot in January?
Naples is cool in January: the average daytime high is 12.0°C and nights average 5.8°C. Days over 25°C are rare in January.
Can you swim in the sea in Naples in January?
The sea around Naples averages 15.0°C in January, which is cold for swimming without a wetsuit. Between 1991 and 2020 it ranged from 15°C to 16°C depending on the year.
How much does it rain in Naples in January?
Naples sees about 11 rainy days (1 mm or more) and 107 mm of rain in a typical January. The wettest January between 1991 and 2020 was 2009 (298 mm) and the driest was 2020 (14 mm).
How sunny is Naples in January?
Naples gets around 4.2 hours of sunshine a day in January out of 9.4 hours of daylight (estimated from average cloud cover).
How does Naples compare with the UK in January?
Naples is on average 4.6°C warmer than London by day in January (12.0°C against 7.4°C).
What is the hottest January on record in Naples?
Between 1991 and 2020 the hottest January day in Naples reached 18.9°C on 2018-01-08, and the coldest night dropped to -3.7°C on 2017-01-08.
Can you swim in the sea in January?
The sea averages 15°C, which is cold rather than comfortably swimmable. If relaxed sea swimming is an important part of your holiday, January is a poor fit. Plan around time on land rather than expecting a beach-and-swim break.
Is Naples close enough for a short winter break?
The flight from London takes about 2 h 42 min, making Naples a short-haul option. That makes it practical to consider for a brief trip, provided you want a cool-weather city stay rather than a quick dose of dependable warmth.
When should I go instead for warmer holiday weather?
July, August and June are the stronger choices overall for holiday weather in Naples. January is the coldest month, so choose it because cool days suit your plans, not because you expect summer conditions without the summer timing.
About these averages
ERA5-Land climate reanalysis via Open-Meteo (11 km grid) and NOAA Coral Reef Watch 5 km sea temperatures, 1991-2020
Averages computed from daily values at Naples. Sea temperature from the nearest 5 km sea cell, 8.6 km from that point. Sunshine hours are estimated from average cloud cover.Records are the highest and lowest daily values in that 30-year period, not all-time records. These are climate averages, not a forecast for your trip. How we measure holiday weather
- Hot · 25°C+
- Warm · 20°C to below 25°C
- Mild · 15°C to below 20°C
- Cool · below 15°C