This report describes the typical weather at the Honolulu International Airport (Honolulu, Hawaii, United States) weather station over the course of an average April. 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 April is characterized by essentially constant daily high temperatures, with daily highs around 82°F throughout the month, exceeding 85°F or dropping below 78°F only one day in ten.
Over the course of April, the length of the day is gradually increasing. The shortest day of the month is April 1 with 12:22 hours of daylight; the longest day is April 30 with 12:56 hours of daylight.
The earliest sunrise is at 6:01am on April 30; the latest sunset is at 6:57pm on April 30; the latest sunrise is at 6:24am on April 1; the earliest sunset is at 6:46pm on April 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 April 15, a representative day, the sky is clear or mostly clear 28% of the time, partly cloudy 37% 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 40%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 70% of those days with precipitation. It is most likely around April 28, when it is observed during 29% of all days.
Moderate rain is the most severe precipitation observed during 22% of those days with precipitation. It is most likely around April 1, when it is observed during 10% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 51% (mildly humid) to 83% (humid) over the course of a typical April, rarely dropping below 43% (comfortable), or exceeding 93% (very humid).
The air is driest around April 22, at which time the relative humidity drops below 55% (mildly humid) three days out of four; it is most humid around April 1, rising above 77% (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 April, the dew point typically varies from 60°F (comfortable) to 66°F (muggy) and is rarely below 56°F (comfortable) or above 70°F (muggy).
Over the course of April typical wind speeds vary from 4 mph to 18 mph (light breeze to fresh breeze), rarely exceeding 24 mph (fresh breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around April 6, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 11 mph (gentle breeze) occurs around April 26, at which time the average daily maximum wind speed is 18 mph (fresh breeze).