Naples weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Excellent
Best time to visit: May – July, September
What is the weather like in Naples in September?
In September, Naples is warm: daytime highs average 25 °C, and nights cool down to about 18 °C. The sea averages 24.4 °C – pleasant for swimming. The sun shines for around 8 hours a day. Rain falls on about 9 days, adding up to 102 mm. All in all, September is an excellent month for a holiday in Naples.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 83 | 87 | 78 |
| Day | 30° | 25° | 21° |
| Night | 22° | 18° | 15° |
| Sea | 26° | 24° | 22° |
| Sun | 11 h | 8 h | 7 h |
| Rain days | 3 | 9 | 10 |
More details for September
- Daylight
- 12 h 32 min06:42 – 19:14
- UV index
- 6 · highclear sky, noon (estimate)
- Muggy days
- 10 daysdew point 18 °C or more
- Wind
- 16 km/haverage daily peak
- Cloud cover
- 40 %on average
- Hot days
- 2 days30 °C or more
- Time zone
- UTC+2Europe/Rome
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %83 %
- Few rainy daysweight 30 %68 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Rain jacket or umbrella
Naples in September: quick answers
Is Naples hot in September?
Warm rather than hot: in September, daytime highs in Naples average 25 °C and nights cool to about 18 °C. On about 2 days the thermometer climbs to 30 °C or more.
Can you swim in Naples in September?
Yes. In September the sea averages 24.4 °C – pleasant for swimming.
Does it rain much in Naples in September?
Rain falls on about 9 days, adding up to 102 mm.
Naples month by month
The whole year in NaplesAll destinations: Italy
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)