Your July weather guide
HotWeather in Naples in July
July is a good time for Naples if you want hot weather and warm sea swimming, but less suitable if you prefer cool days for walking around a city. Average highs reach 29°C, nights stay around 21°C, and the sea averages 25.5°C. Rain is a relatively small part of the picture. The main catch is sustained warmth: plan active time away from midday and choose somewhere you can sleep comfortably.
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
- 28.9°C
- 9 in 10 days stay below 32°C
- Average night-time low
- 20.6°C
- coldest 10% of nights: 18°C or lower
- Compared with London
- +7.1°C
- London averages 21.8°C in July
- Sea temperature
- 25.5°C
- year to year: 24°C to 27°C
- Sunshine per day (est.)
- 11.7h
- 80% of 14.7 h of daylight
- Rainy days (1 mm+)
- 4
- 19 mm over the month
- Humidity
- 70%
- Days over 25°C
- 95%
- 34% over 30°C
- Record high 1991-2020
- 35.5°C
- 2005-07-29
- Record low 1991-2020
- 14.8°C
- 2019-07-17
- 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 July compares
July is the 2nd warmest month of the year in Naples and ranks 58th of 134 destinations we compare for July - see where else is hot in July. Within Italy it is 6th of 16 (Italy in July). Against London's average high of 21.8°C in July, Naples is 7.1°C warmer by day and 7.1°C warmer at night.
Daytime and night-time in July
The typical July day in Naples peaks at 28.9°C, but that is an average: the warmest 10% of days reach 31.7°C or more. About 95% of days top 25°C and 1 in 3 pass 30°C. Nights average 20.6°C; one night in ten drops to 18.1°C or lower, so pack a layer for evenings. Between 1991 and 2020 the hottest July day here reached 35.5°C (2005-07-29) and the coldest night 14.8°C (2019-07-17).
Rain in July
Some rain (4-8 rainy days): about 4 days with 1 mm or more, 19 mm in total. Year to year it varies a lot - the wettest July was 2002 with 68 mm, the driest 2007 with 1 mm. Humidity averages 70%.
Sea temperature in July
The sea averages 25.5°C - warm enough to swim (22°c+). Depending on the year it ranges from 24.1°C to 26.5°C. For the warmest sea here, come in August (26.4°C).
Sunshine and daylight
Around 11.7 hours of sunshine a day (estimated from cloud cover), 14.7 hours of daylight: the sun rises about 05:44 and sets about 20:34 local time in mid-July. Average cloud cover is 20%.
Is July a good time to visit Naples?
Yes - it is one of the better months: hot days, manageable rain and long sunny days. The best months for Naples on our scoring are July, August, June; months averaging 25°C or more: Jun, Jul, Aug, Sep.
Expect proper heat, not just a warmer UK summer
July is among Naples's warmest months, and the heat is fairly dependable: 94% of days reach 25°C, while 34% reach 30°C. That makes it a strong choice for travellers who enjoy summer warmth, but a less comfortable fit for anyone planning to walk all day without breaks. With humidity averaging 70%, allow for sticky spells rather than expecting dry heat. Keep longer walks for the morning, take shaded breaks around midday and carry water. Light, loose clothing will be more useful than heavy layers. Nights remain warm on average, so air conditioning is a sensible accommodation priority if heat tends to disturb your sleep.
Plenty of sunshine, with warm water and some rain
Around 11.7 hours of sunshine within 14.7 hours of daylight gives you plenty of room to shift outdoor plans towards the cooler ends of the day. Sun protection matters even when you are only spending short spells outside; a hat and sunscreen belong in your daily bag. The sea is warm enough for swimming, so July suits a trip that mixes city time with time in the water. Rain is possible, with about 4 rainy days during the month, but it is not a strong reason to avoid going. Keep a flexible indoor option rather than planning every day around clear skies, and pack a light waterproof without making wet-weather clothing the focus.
A little perspective
Naples through the year
July 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+ |
|---|---|---|---|---|---|---|---|
| January | 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% |
| JulySelectedbest | 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 July
Closest matches on daytime temperature, sea temperature and sunshine, in other countries.
A little more detail
Naples in July FAQs
Plain answers, grounded in the averages.
Is Naples hot in July?
Naples is hot in July: the average daytime high is 28.9°C and nights average 20.6°C. About 95% of July days reach 25°C or more.
Can you swim in the sea in Naples in July?
The sea around Naples averages 25.5°C in July, which is warm enough for most people to swim comfortably. Between 1991 and 2020 it ranged from 24°C to 27°C depending on the year.
How much does it rain in Naples in July?
Naples sees about 4 rainy days (1 mm or more) and 19 mm of rain in a typical July. The wettest July between 1991 and 2020 was 2002 (68 mm) and the driest was 2007 (1 mm).
How sunny is Naples in July?
Naples gets around 11.7 hours of sunshine a day in July out of 14.7 hours of daylight (estimated from average cloud cover).
How does Naples compare with the UK in July?
Naples is on average 7.1°C warmer than London by day in July (28.9°C against 21.8°C).
What is the hottest July on record in Naples?
Between 1991 and 2020 the hottest July day in Naples reached 35.5°C on 2005-07-29, and the coldest night dropped to 14.8°C on 2019-07-17.
How much hotter is Naples than London in July?
Naples has an average daytime high of 28.9°C, compared with London's 21.8°C - a difference of 7.1°C. Expect a noticeable step up in heat, rather than a small change, and leave more room for shade and rests during the day.
Is the sea warm enough for swimming in July?
Yes. The sea averages 25.5°C, with a year-to-year range of 24°C to 26°C, making July a comfortable choice for warm-water swimming. Sea temperature is unlikely to be the limiting factor, though you should still judge local conditions before getting in.
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