Weather in Naples in September 2025
Average weather
Average temperature in Naples in September
The temperature in September is +84°F on average, with a range between a maximum of +90°F during the day and a minimum of +61°F at night.
The average maximum temperature goes up 13% by the end of the month, compared with the beginning of the month, from +81°F to +84°F.
Is Naples warm or cold in September?
Naples is typically warm in September.
Maximum temperatures go down compared to the previous month from +86°F to +79°F. The minimum temperature also goes down from +72°F to +64°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Naples, here is the comparison with other months:
Water temperature in Naples in September
Water in Naples in September is Comfortable. It varies from +73°F to +81°F, with an average of +77°F. This is almost similar to the air temperature, which averages +79°F.
The water temperature in September is one of the warmest of the entire year:
Can you swim in Naples in September?
Climate in Naples in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +86°F | +79°F | +72°F | ||||
| Min. temperature | ||||||
| +55°F | +52°F | +43°F | ||||
| Max. temperature | ||||||
| +100°F | +95°F | +88°F | ||||
| Rainfall | ||||||
| 19 mm | 86 mm | 123 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Avg. water temperature | ||||||
| +79°F | +77°F | +71°F | ||||
| Humidity | ||||||
| 68% | 70% | 74% | ||||
| Air pressure | ||||||
| 1013 HPa | 1015 HPa | 1016 HPa | ||||
| Sunny days | ||||||
| 22 | 15 | 12 | ||||
| Cloudy days | ||||||
| 3 | 4 | 5 | ||||
| Rainy days | ||||||
| 4 | 7 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September typically has worse weather conditions compared to August. It’s getting colder in September. From +86°F in the day, the average maximum temperature lowers to +79°F. Prepare for more rain. Average rainfall goes from 19 mm to 86 mm. Humidity rises from 68% to 70%. The average wind speed doesn’t change much during September, staying around 1 m/s. The days becoming less sunny, going from 22 sunny days in August to 15 in September.
October brings much the same weather, it remains good.
Wind
The average wind speed is 2 m/s getting up to 6 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Naples is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Naples?
Climate Change Over the Years
The climate in Naples in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1980 (+64°F) and the highest in 2018 (+72°F). The driest year was 1983 with only 596 mm of rainfall, and the wettest year was 2023 with 3024 mm.
FAQ
Is September a good time to visit Naples?
Can you sunbathe in Naples in September?
Can you swim in Naples in September?
Is Naples rainy in September?
Is it sunny in Naples in September?
Other cities in Italy
Monthly weather in Naples
Source of the data
For this page, we’ve looked at the typical weather in Naples, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.