This report describes the typical weather at the Honolulu International Airport (Honolulu, Hawaii, United States) weather station over the course of an average August. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Honolulu, Hawaii has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (97%) and built-up areas (3%).
The month of August is characterized by essentially constant daily high temperatures, with daily highs around 88°F throughout the month, exceeding 91°F or dropping below 85°F only one day in ten.
Over the course of August, the length of the day is gradually decreasing. The shortest day of the month is August 31 with 12:33 hours of daylight; the longest day is August 1 with 13:05 hours of daylight.
The earliest sunrise is at 6:06am on August 2; the latest sunset is at 7:10pm on August 1; the latest sunrise is at 6:15am on August 31; the earliest sunset is at 6:48pm on August 31.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 50% (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 29% of the time, partly cloudy 43% of the time, and mostly cloudy or overcast 29% of the time.
The average probability that some form of precipitation will be observed in a given day is 35%, with little variation over the course of the month.
Throughout August, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 74% of those days with precipitation. It is most likely around August 1, when it is observed during 28% of all days.
Moderate rain is the most severe precipitation observed during 19% of those days with precipitation. It is most likely around August 1, when it is observed during 7% 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 49% (comfortable) to 81% (humid) over the course of a typical August, rarely dropping below 42% (comfortable), or exceeding 90% (very humid).
The air is driest around August 9, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around August 31, rising above 75% (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 65°F (mildy humid) to 70°F (muggy) and is rarely below 61°F (comfortable) or above 73°F (very muggy).
Over the course of August typical wind speeds vary from 4 mph to 19 mph (light breeze to fresh breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 12 mph (moderate breeze) occurs around August 3, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around August 31, at which time the average daily maximum wind speed is 18 mph (fresh breeze).