September Weather in Naples, United States

Last updated: June 24, 2025

The average temperature in Naples, United States during September is a warm 26°C (78°F). Temperatures can fluctuate, with a minimum of 10°C (50°F) and a maximum reaching up to 38°C (101°F). Expect precipitation around 86 mm (3.4 in) spread over 8 days, and enjoy a comfortable average humidity of 63%.

September Temperature in Naples

In September in Naples, the average temperature is 26°C (78°F), with maximums reaching up to 38°C (101°F) and minimums dropping as low as 10°C (50°F). It’s a versatile climate that allows for both warm beach days and cooler evenings, making it an ideal destination for travelers seeking a range of outdoor activities.

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 26°C (78°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).

Data source: Temperature data for Naples generated using information from the Copernicus Climate Change Service.

September Precipitation in Naples

In Naples in September, the precipitation amount reaches 86 mm (3.4 in) over the course of 8 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 8 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Naples

In Naples in September humidity is 63%. With an average temperature of 26°C (78°F), this humidity feels like a warm, tropical embrace, making outdoor activities pleasantly refreshing yet slightly sticky, perfect for leisurely strolls and beachside adventures.

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 63%, offering insight into how humid the weather typically is during this month.

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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check 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 10, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	8°C (47°F)	102 mm (4.0 inches)	82%	moderate
February Weather	9°C (49°F)	146 mm (5.8 inches)	80%	high
March Weather	15°C (59°F)	130 mm (5.1 inches)	78%	very high
April Weather	18°C (64°F)	198 mm (7.8 inches)	79%	very high
May Weather	23°C (73°F)	163 mm (6.4 inches)	81%	extreme
June Weather	27°C (80°F)	103 mm (4.1 inches)	77%	extreme
July Weather	28°C (84°F)	79 mm (3.1 inches)	72%	extreme
August Weather	28°C (83°F)	83 mm (3.3 inches)	65%	extreme
September Weather	26°C (78°F)	86 mm (3.4 inches)	63%	very high
October Weather	20°C (67°F)	120 mm (4.7 inches)	70%	very high
November Weather	13°C (55°F)	67 mm (2.6 inches)	82%	high
December Weather	10°C (51°F)	118 mm (4.6 inches)	88%	moderate