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Summer Weather in Honolulu Hawaii, United States

Daily high temperatures are around 86°F, rarely falling below 82°F or exceeding 89°F.

Daily low temperatures are around 75°F, rarely falling below 71°F or exceeding 78°F. The highest daily average low temperature is 76°F on August 11.

For reference, on August 22, the hottest day of the year, temperatures in Honolulu typically range from 76°F to 87°F, while on January 28, the coldest day of the year, they range from 68°F to 79°F.

Average High and Low Temperature in the Summer in Honolulu

Average High and Low Temperature in the Summer in HonoluluJunJulAug68°F68°F70°F70°F72°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°F92°F92°FSpringFallJun 184°FJun 184°F73°F73°FAug 3187°FAug 3187°F76°F76°FJul 186°FJul 186°F75°F75°FAug 187°FAug 187°F76°F76°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average summer temperatures. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in the Summer in Honolulu

Average Hourly Temperature in the Summer in HonoluluJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFallcomfortablewarmhotcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Suva, Fiji (3,166 miles away) is the far-away foreign place with temperatures most similar to Honolulu (view comparison).

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Compare Honolulu to another city:

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The summer in Honolulu experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 26% throughout the season. The lowest chance of overcast or mostly cloudy conditions is 25% on August 13.

The clearest day of the summer is August 13, with clear, mostly clear, or partly cloudy conditions 75% of the time.

For reference, on October 30, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 41%, while on January 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.

Cloud Cover Categories in the Summer in Honolulu

Cloud Cover Categories in the Summer in HonoluluJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFallOct 3059%Oct 3059%Jun 173%Jun 173%Aug 3172%Aug 3172%Jul 174%Jul 174%Aug 174%Aug 174%clearmostly clearpartly cloudyovercastmostly cloudy
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Honolulu, the chance of a wet day over the course of the summer is gradually increasing, starting the season at 8% and ending it at 10%.

For reference, the year's highest daily chance of a wet day is 25% on January 11, and its lowest chance is 6% on June 19.

Probability of Precipitation in the Summer in Honolulu

Probability of Precipitation in the Summer in HonoluluJunJulAug0%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%SpringFallJun 196%Jun 196%Jun 18%Jun 18%Aug 3110%Aug 3110%Jul 17%Jul 17%Aug 19%Aug 19%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Honolulu is gradually increasing, starting the season at 0.4 inches, when it rarely exceeds 1.0 inches, and ending the season at 0.8 inches, when it rarely exceeds 2.1 inches.

The lowest average 31-day accumulation is 0.3 inches on June 11.

Average Monthly Rainfall in the Summer in Honolulu

Average Monthly Rainfall in the Summer in HonoluluJunJulAug0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inSpringFallJun 110.3 inJun 110.3 inAug 310.8 inAug 310.8 inJul 10.5 inJul 10.5 inAug 10.8 inAug 10.8 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of the summer in Honolulu, the length of the day is decreasing. From the start to the end of the season, the length of the day decreases by 48 minutes, implying an average daily decrease of 32 seconds, and weekly decrease of 3 minutes, 43 seconds.

The shortest day of the summer is August 31, with 12 hours, 33 minutes of daylight and the longest day is June 20, with 13 hours, 26 minutes of daylight.

Hours of Daylight and Twilight in the Summer in Honolulu

Hours of Daylight and Twilight in the Summer in HonoluluJunJulAug0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrSpringFallJun 2013 hr, 26 minJun 2013 hr, 26 minnightnightdaydayAug 3112 hr, 33 minAug 3112 hr, 33 minAug 113 hr, 5 minAug 113 hr, 5 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the summer in Honolulu is 5:48 AM on June 5 and the latest sunrise is 26 minutes later at 6:14 AM on August 31.

The latest sunset is 7:17 PM on July 4 and the earliest sunset is 30 minutes earlier at 6:47 PM on August 31.

Daylight saving time is not observed in Honolulu during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:50 AM and sets 13 hours, 26 minutes later, at 7:16 PM, while on December 21, the shortest day of the year, it rises at 7:04 AM and sets 10 hours, 50 minutes later, at 5:55 PM.

Sunrise & Sunset with Twilight in the Summer in Honolulu

Sunrise & Sunset with Twilight in the Summer in HonoluluJunJulAug2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMSpringFall5:48 AM5:48 AMJun 57:11 PMJun 57:11 PM5:54 AM5:54 AMJul 47:17 PMJul 47:17 PM6:14 AM6:14 AMAug 316:47 PMAug 316:47 PM6:05 AM6:05 AMAug 17:09 PMAug 17:09 PMSolarMidnightSolarMidnightSolarNoonSunriseSunset
The solar day in the summer. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in the Summer in Honolulu

Solar Elevation and Azimuth in the Summer in HonoluluJunJulAug12 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMSpringFall001020203030405050606070800010102030304040506060707080
northeastsouthwest
Solar elevation and azimuth in the the summer of 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for the summer of 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in the Summer in Honolulu

Moon Rise, Set & Phases in the Summer in HonoluluJunJulAug12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMSpringFallMay 75:23 PMMay 75:23 PMMay 233:54 AMMay 233:54 AMJun 62:38 AMJun 62:38 AMJun 213:09 PMJun 213:09 PMJul 512:58 PMJul 512:58 PMJul 2112:18 AMJul 2112:18 AMAug 41:14 AMAug 41:14 AMAug 198:26 AMAug 198:26 AMSep 23:56 PMSep 23:56 PMSep 174:35 PMSep 174:35 PM5:30 AM5:30 AM7:01 PM7:01 PM6:44 PM6:44 PM5:47 AM5:47 AM5:48 AM5:48 AM7:58 PM7:58 PM7:32 PM7:32 PM6:22 AM6:22 AM7:39 PM7:39 PM7:13 PM7:13 PM6:16 AM6:16 AM7:45 PM7:45 PM6:39 PM6:39 PM6:08 AM6:08 AM5:59 AM5:59 AM6:52 PM6:52 PM6:34 PM6:34 PM6:59 AM6:59 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Honolulu is very rapidly increasing during the summer, rising from 63% to 92% over the course of the season.

For reference, on September 20, the muggiest day of the year, there are muggy conditions 93% of the time, while on March 8, the least muggy day of the year, there are muggy conditions 29% of the time.

Humidity Comfort Levels in the Summer in Honolulu

Humidity Comfort Levels in the Summer in HonoluluJunJulAug0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%SpringFallJun 163%Jun 163%Aug 3192%Aug 3192%Jul 179%Jul 179%Aug 189%Aug 189%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Honolulu is essentially constant during the summer, remaining within 1.0 miles per hour of 15.5 miles per hour throughout.

For reference, on July 2, the windiest day of the year, the daily average wind speed is 16.5 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 12.3 miles per hour.

The highest daily average wind speed during the summer is 16.5 miles per hour on July 2.

Average Wind Speed in the Summer in Honolulu

Average Wind Speed in the Summer in HonoluluJunJulAug0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphSpringFallJul 216.5 mphJul 216.5 mphJun 114.5 mphJun 114.5 mphAug 3114.6 mphAug 3114.6 mphAug 116.1 mphAug 116.1 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction in Honolulu throughout the summer is predominantly from the east, with a peak proportion of 98% on June 23.

Wind Direction in the Summer in Honolulu

Wind Direction in the Summer in HonoluluJunJulAug0%100%20%80%40%60%60%40%80%20%100%0%SpringFalleastnorthwest
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Honolulu is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Honolulu is gradually increasing during the summer, rising by 3°F, from 78°F to 80°F, over the course of the season.

Average Water Temperature in the Summer in Honolulu

Average Water Temperature in the Summer in HonoluluJunJulAug74°F74°F75°F75°F76°F76°F77°F77°F78°F78°F79°F79°F80°F80°F81°F81°F82°F82°FSpringFallJun 178°FJun 178°FAug 3180°FAug 3180°FJul 178°FJul 178°FAug 179°FAug 179°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

Temperatures in Honolulu are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in the Summer in Honolulu

Time Spent in Various Temperature Bands and the Growing Season in the Summer in HonoluluJunJulAug0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%SpringFall100%Jul 17100%Jul 17comfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

The average accumulated growing degree days in Honolulu are very rapidly increasing during the summer, increasing by 2,704°F, from 3,712°F to 6,415°F, over the course of the season.

Growing Degree Days in the Summer in Honolulu

Growing Degree Days in the Summer in HonoluluJunJulAug4,000°F4,000°F4,500°F4,500°F5,000°F5,000°F5,500°F5,500°F6,000°F6,000°F6,500°F6,500°FSpringFallJun 13,712°FJun 13,712°FAug 316,415°FAug 316,415°FJul 14,576°FJul 14,576°FAug 15,501°FAug 15,501°F
The average growing degree days accumulated over the course of the summer, with 25th to 75th and 10th to 90th percentile bands.

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Honolulu is gradually decreasing during the summer, falling by 0.6 kWh, from 7.6 kWh to 7.0 kWh, over the course of the season.

The highest average daily incident shortwave solar energy during the summer is 7.6 kWh on June 9.

Average Daily Incident Shortwave Solar Energy in the Summer in Honolulu

Average Daily Incident Shortwave Solar Energy in the Summer in HonoluluJunJulAug0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhSpringFallJun 97.6 kWhJun 97.6 kWhAug 317.0 kWhAug 317.0 kWhJul 17.6 kWhJul 17.6 kWhAug 17.4 kWhAug 17.4 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Honolulu are 21.307 deg latitude, -157.858 deg longitude, and 59 ft elevation.

The topography within 2 miles of Honolulu contains significant variations in elevation, with a maximum elevation change of 810 feet and an average elevation above sea level of 79 feet. Within 10 miles contains significant variations in elevation (3,104 feet). Within 50 miles contains large variations in elevation (4,121 feet).

The area within 2 miles of Honolulu is covered by artificial surfaces (72%) and water (22%), within 10 miles by water (47%) and artificial surfaces (24%), and within 50 miles by water (91%).

This report illustrates the typical weather in Honolulu, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Honolulu.

For each station, the records are corrected for the elevation difference between that station and Honolulu according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Honolulu is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Honolulu and a given station.

The stations contributing to this reconstruction are:

To get a sense of how much these sources agree with each other, you can view a comparison of Honolulu and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © OpenStreetMap contributors.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.

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