This report describes the typical weather at the Honolulu International Airport (Honolulu, Hawaii, United States) weather station over the course of an average May. 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 May is characterized by gradually rising daily high temperatures, with daily highs around 84°F throughout the month, exceeding 88°F or dropping below 80°F only one day in ten.
Over the course of May, the length of the day is essentially constant. The shortest day of the month is May 1 with 12:57 hours of daylight; the longest day is May 31 with 13:21 hours of daylight.
The earliest sunrise is at 5:49am on May 30; the latest sunset is at 7:10pm on May 31; the latest sunrise is at 6:01am on May 1; the earliest sunset is at 6:57pm on May 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 51% (partly cloudy) and does not vary substantially over the course of the month.
On May 16, a representative day, the sky is clear or mostly clear 29% of the time, partly cloudy 38% of the time, and mostly cloudy or overcast 33% of the time.
The average probability that some form of precipitation will be observed in a given day is 37%, with little variation over the course of the month.
Throughout May, 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 May 29, when it is observed during 28% of all days.
Moderate rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around May 1, when it is observed during 8% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 50% (comfortable) to 81% (humid) over the course of a typical May, rarely dropping below 43% (comfortable), or exceeding 91% (very humid).
The air is driest around May 30, at which time the relative humidity drops below 53% (mildly humid) three days out of four; it is most humid around May 1, rising above 76% (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 May, the dew point typically varies from 61°F (comfortable) to 68°F (muggy) and is rarely below 57°F (comfortable) or above 71°F (very muggy).
Over the course of May typical wind speeds vary from 4 mph to 18 mph (light breeze to fresh breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around May 31, at which time the average daily maximum wind speed is 18 mph (moderate breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around May 23, at which time the average daily maximum wind speed is 17 mph (moderate breeze).