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September Weather in Naples, United States

Last updated: June 24, 2025

In September, the average temperature in Naples, United States is 17°C (62°F). Expect a diverse range of daily temperatures, with minimums plunging to 1°C (34°F) and maximums soaring up to 32°C (89°F). The month also sees approximately 86 mm (3.4 in) of precipitation spread over 9 days, contributing to an average humidity level of 76%.

September Temperature in Naples

In September in Naples, the average temperature is 17°C (62°F). Maximum temperatures can reach 32°C (89°F), while minimums can dip as low as 1°C (34°F). Be sure to pack layers to stay comfortable while exploring the diverse climate!

September Weather in Naples: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Naples, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Naples, September typically has an average temperature of 17°C (62°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec252734455765706962523730
Data source: Temperature data for Naples generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Naples

In Naples in September, the precipitation amount is 86 mm (3.4 in), falling over the course of 9 days.

September Precipitation Trends in Naples

The chart displays monthly precipitation patterns in Naples, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Naples, September typically receives around 86 mm (3.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec75857611212610614487861388488
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Naples

In Naples in September, humidity is 76%. With an average temperature of 17°C (62°F), this humidity feels like a warm, enveloping embrace, making travel feel slightly more challenging as it can lead to a sticky discomfort, especially during outdoor excursions.

September Average Humidity in Naples

This chart illustrates the average monthly humidity levels in Naples, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Naples is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Naples

In Naples in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Naples.

Maximum UV Index Levels in Naples for September

The chart shows the monthly maximum UV Index (UVI) for Naples in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Naples typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Naples September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Naples Compares to Other Months

Weather in Naples varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Naples, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Naples, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)75 mm (3.0 inches)91%moderate
February Weather-3°C (27°F)85 mm (3.4 inches)91%moderate
March Weather1°C (34°F)76 mm (3.0 inches)88%high
April Weather7°C (45°F)112 mm (4.4 inches)88%very high
May Weather14°C (57°F)126 mm (5.0 inches)82%very high
June Weather19°C (66°F)106 mm (4.2 inches)79%very high
July Weather21°C (71°F)144 mm (5.7 inches)77%very high
August Weather20°C (69°F)87 mm (3.4 inches)72%very high
September Weather17°C (62°F)86 mm (3.4 inches)76%very high
October Weather11°C (52°F)138 mm (5.4 inches)83%high
November Weather3°C (37°F)84 mm (3.3 inches)88%moderate
December Weather-1°C (30°F)88 mm (3.5 inches)87%low

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