Average Weather in Naples Italy
In Naples, the temperature typically varies from 42°F to 86°F over the course of the year, and is rarely below 35°F or above 92°F.
The hot season lasts for 2.8 months, from June 17 to September 12, with an average daily high temperature above 80°F. The hottest day of the year is August 6, with an average high of 86°F and low of 70°F.
The cool season lasts for 4.0 months, from November 23 to March 24, with an average daily high temperature below 62°F. The coldest day of the year is February 8, with an average low of 42°F and high of 55°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
The length of the day in Naples varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 14 minutes of daylight; the longest day is June 21, with 15 hours, 7 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:30 AM on June 14, and the latest sunrise is 1 hour, 58 minutes later at 7:28 AM on October 28. The earliest sunset is at 4:35 PM on December 8, and the latest sunset is 4 hours, 4 minutes later at 8:38 PM on June 27.
Daylight saving time (DST) is observed in Naples during 2017, starting in the spring on March 26, lasting 7.1 months, and ending in the fall on October 29.
Sunrise & Sunset with Twilight and Daylight Saving Time
In Naples, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Naples begins around June 8 and lasts for 3.2 months, ending around September 13. On July 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 90% of the time, and overcast or mostly cloudy 10% of the time.
The cloudier part of the year begins around September 13 and lasts for 8.8 months, ending around June 8. On January 14, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Naples varies throughout the year.
The wetter season lasts 7.6 months, from September 13 to May 2, with a greater than 22% chance of a given day being a wet day. The chance of a wet day peaks at 37% on November 20.
The drier season lasts 4.4 months, from May 2 to September 13. The smallest chance of a wet day is 7% on July 7.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 37% on November 20.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day in the year. Naples experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Naples. The most rain falls during the 31 days centered around November 18, with an average total accumulation of 4.0 inches.
The least rain falls around July 10, with and average total accumulation of 0.5 inches.
Average Monthly Rainfall
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
Naples experiences very significant seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.9 months, from June 5 to October 2, during which time the comfort level is muggy, oppressive, or miserable at least 17% of the time. The muggiest day of the year is August 10, with muggy conditions 68% of the time.
The least muggy day of the year is December 18, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Naples experiences mildly seasonal variation over the course of the year.
The windier part of the year lasts for 5.6 months, from October 21 to April 10, with average wind speeds of more than 4.2 miles per hour. The windiest day of the year is December 21, with an average hourly wind speed of 5.2 miles per hour.
The calmer time of year lasts for 6.4 months, from April 10 to October 21. The calmest day of the year is August 6, with an average hourly wind speed of 3.3 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Naples varies throughout the year.
The wind is most often from the east for 2.0 months, from October 20 to December 21, with a peak percentage of 30% on November 25. The wind is most often from the west for 10.0 months, from December 21 to October 20, with a peak percentage of 59% on July 13.
Naples is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.
The average water temperature experiences significant seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.8 months, from June 28 to September 23, with an average temperature above 74°F. The day of the year with the warmest water is August 12, with an average temperature of 79°F.
The time of year with cooler water lasts for 4.3 months, from December 19 to April 28, with an average temperature below 62°F. The day of the year with the coolest water is February 27, with an average temperature of 57°F.
Average Water Temperature
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy experiences very significant seasonal variation over the course of the year.
The brighter period of the year lasts for 3.3 months, from May 10 to August 18, with an average daily incident shortwave energy per square meter above 6.5 kWh. The brightest day of the year is July 6, with an average of 7.7 kWh.
The darker period of the year lasts for 3.6 months, from October 28 to February 16, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 15, with an average of 1.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Naples are 40.856 deg latitude, 14.246 deg longitude, and 285 ft elevation (map ).
The topography within 2 miles of Naples contains very significant variations in elevation, with a maximum elevation change of 1,148 feet, and an average elevation above sea level of 353 feet. Within 10 miles contains extreme variations in elevation (4,186 feet). Within 50 miles also contains extreme variations in elevation (6,732 feet).
The area within 2 miles of Naples is covered by artificial surfaces (83%), within 10 miles by artificial surfaces (32%) and water (31%), and within 50 miles by water (50%) and cropland (27%).
This report illustrates the typical weather in Naples, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Naples.
For each station, the records are corrected for the elevation difference between that station and Naples according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Naples is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Naples and a given station.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .