This report describes the typical weather at the Cape Town International Airport (Cape Town, South Africa) weather station over the course of an average August. It is based on the historical records from 1994 to 2012. Earlier records are either unavailable or unreliable.
Cape Town has a mediterranean climate with dry warm summers and mild winters. The area within 25 mi of this station is covered by oceans and seas (40%), grasslands (33%), croplands (17%), built-up areas (6%), and forests (5%).
The month of August is characterized by essentially constant daily high temperatures, with daily highs around 64°F throughout the month, exceeding 72°F or dropping below 58°F only one day in ten.
Over the course of August, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 55 minutes, implying an average day-over-day increase of 1.8 minutes.
The shortest day of the month is August 1 with 10:28 hours of daylight; the longest day is August 31 with 11:23 hours of daylight.
The earliest sunrise is at 7:05am on August 31; the latest sunset is at 6:28pm on August 31; the latest sunrise is at 7:38am on August 1; the earliest sunset is at 6:06pm on August 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 52% (partly cloudy) and does not vary substantially over the course of the month.
On August 16, a representative day, the sky is clear or mostly clear 40% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 35% of the time.
The average probability that some form of precipitation will be observed in a given day is 42%, with little variation over the course of the month.
Throughout August, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 57% of those days with precipitation. It is most likely around August 12, when it is observed during 25% of all days.
Light rain is the most severe precipitation observed during 36% of those days with precipitation. It is most likely around August 19, when it is observed during 16% of all days.
Either snow is exceptionally unlikely to fall at this location in August or this station does not reliably report precipitation types.
The relative humidity typically ranges from 54% (mildly humid) to 97% (very humid) over the course of a typical August, rarely dropping below 32% (comfortable) and reaching as high as 100% (very humid).
The air is driest around August 18, at which time the relative humidity drops below 64% (mildly humid) three days out of four; it is most humid around August 8, rising above 94% (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 August, the dew point typically varies from 41°F (dry) to 53°F (very comfortable) and is rarely below 34°F (dry) or above 57°F (comfortable).
The time of the month between August 1 and August 31 is the most comfortable, with dew points that are neither too dry nor too muggy.
Over the course of August typical wind speeds vary from 1 mph to 18 mph (light air to fresh breeze), rarely exceeding 27 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around August 31, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around August 15, at which time the average daily maximum wind speed is 16 mph (moderate breeze).