This report describes the typical weather at the Faro Airport (Faro, Portugal) weather station over the course of an average September. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Faro has a mediterranean climate with dry hot summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (57%), croplands (24%), and shrublands (18%).
The month of September is characterized by falling daily high temperatures, with daily highs decreasing from 82°F to 76°F over the course of the month, exceeding 88°F or dropping below 72°F only one day in ten.
Over the course of September, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 1:07 hours, implying an average day-over-day decrease of 2.2 minutes.
The shortest day of the month is September 30 with 11:49 hours of daylight; the longest day is September 1 with 12:57 hours of daylight.
The earliest sunrise is at 7:03am on September 1; the latest sunset is at 8:00pm on September 1; the latest sunrise is at 7:27am on September 30; the earliest sunset is at 7:16pm 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 ranges from 11% (mostly clear) to 26% (mostly clear). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 15% from the start to the end of the month.
On September 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 79% of the time, and overcast or mostly cloudy 6% of the time.
On September 30, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 31% of the time, and clear or mostly clear 57% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around September 30, occurring in 20% of days. Precipitation is least likely around September 1, occurring in 8% of days.
Throughout September, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.
Moderate rain is the most severe precipitation observed during 50% of those days with precipitation. It is most likely around September 30, when it is observed during 10% of all days.
Light rain is the most severe precipitation observed during 19% of those days with precipitation. It is most likely around September 30, when it is observed during 4% of all days.
Thunderstorms are the most severe precipitation observed during 18% of those days with precipitation. They are most likely around September 30, when it is observed during 4% 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 48% (comfortable) to 93% (very humid) over the course of a typical September, rarely dropping below 31% (comfortable) and reaching as high as 100% (very humid).
The air is driest around September 1, at which time the relative humidity drops below 58% (mildly humid) three days out of four; it is most humid around September 28, rising above 88% (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 53°F (very comfortable) to 66°F (muggy) and is rarely below 44°F (dry) or above 70°F (muggy).
Over the course of September typical wind speeds vary from 1 mph to 14 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (light breeze) occurs around September 16, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around September 3, at which time the average daily maximum wind speed is 14 mph (moderate breeze).