This report describes the typical weather at the Naples Municipal Airport (Naples, Florida, United States) weather station over the course of an average September. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Naples, Florida has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (49%), croplands (28%), forests (12%), and grasslands (8%).
The month of September is characterized by essentially constant daily high temperatures, with daily highs around 88°F throughout the month, exceeding 92°F or dropping below 84°F only one day in ten.
Over the course of September, the length of the day is gradually decreasing. The shortest day of the month is September 30 with 11:55 hours of daylight; the longest day is September 1 with 12:39 hours of daylight.
The earliest sunrise is at 7:07am on September 1; the latest sunset is at 7:47pm on September 1; the latest sunrise is at 7:19am on September 30; the earliest sunset is at 7:14pm on September 30.
Daylight savings time is observed in 2012 but it neither starts nor ends in September, so the entire month is in daylight time.
The median cloud cover is 23% (mostly clear) and does not vary substantially over the course of the month.
On September 15, a representative day, the sky is clear or mostly clear 57% of the time, partly cloudy 17% of the time, and mostly cloudy or overcast 21% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around September 1, occurring in 71% of days. Precipitation is least likely around September 30, occurring in 47% of days.
Throughout September, the most common forms of precipitation are thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 74% of those days with precipitation. They are most likely around September 1, when it is observed during 57% of all days.
Light rain is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around September 28, when it is observed during 8% of all days.
Either snow is exceptionally unlikely to fall at this location in September or this station does not reliably report precipitation types.
The relative humidity typically ranges from 59% (mildly humid) to 94% (very humid) over the course of a typical September, rarely dropping below 49% (comfortable) and reaching as high as 100% (very humid).
The air is driest around September 30, at which time the relative humidity drops below 63% (mildly humid) three days out of four; it is most humid around September 18, rising above 92% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical September, the dew point typically varies from 69°F (muggy) to 76°F (oppressive) and is rarely below 64°F (mildy humid) or above 79°F (oppressive).
Over the course of September typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around September 15, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around September 1, at which time the average daily maximum wind speed is 13 mph (moderate breeze).