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Average Weather in September in Waipio Hawaii, United States

Daily high temperatures are around 85°F, rarely falling below 83°F or exceeding 88°F.

Daily low temperatures are around 72°F, rarely falling below 69°F or exceeding 75°F.

For reference, on August 23, the hottest day of the year, temperatures in Waipio typically range from 73°F to 86°F, while on January 28, the coldest day of the year, they range from 65°F to 78°F.

Average High and Low Temperature in September

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 temperatures for the quarter of the year centered on September. 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 September

Average Hourly Temperature in September in Waipio1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM4 AM8 AM12 PM4 PM8 PM12 AMAugOctcomfortablecomfortablewarmwarm
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.

Cayey, Puerto Rico (5,887 miles away) is the far-away foreign place with temperatures most similar to Waipio (view comparison).


The month of September in Waipio experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 29% to 37%.

The clearest day of the month is September 2, with clear, mostly clear, or partly cloudy conditions 71% of the time.

For reference, on October 31, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 42%, while on January 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 78%.

Cloud Cover Categories in September

Cloud Cover Categories in September in Waipio181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOctSep 171%Sep 171%Sep 3063%Sep 3063%Sep 1170%Sep 1170%clearmostly clearpartly cloudymostly cloudyovercast
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 Waipio, the chance of a wet day over the course of September is gradually increasing, starting the month at 11% and ending it at 13%.

For reference, the year's highest daily chance of a wet day is 26% on January 11, and its lowest chance is 7% on June 20.

Probability of Precipitation in September

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).


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

The average sliding 31-day rainfall during September in Waipio is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.8 inches.

Average Monthly Rainfall in September

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 liquid-equivalent snowfall.


Over the course of September in Waipio, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 35 minutes, implying an average daily decrease of 1 minute, 13 seconds, and weekly decrease of 8 minutes, 28 seconds.

The shortest day of the month is September 30, with 11 hours, 57 minutes of daylight and the longest day is September 1, with 12 hours, 32 minutes of daylight.

Hours of Daylight and Twilight in September

Hours of Daylight and Twilight in September in Waipio181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAugOctSep 2212 hr, 7 minSep 2212 hr, 7 minnightnightdaydaySep 112 hr, 32 minSep 112 hr, 32 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 month in Waipio is 6:15 AM on September 1 and the latest sunrise is 8 minutes later at 6:22 AM on September 30.

The latest sunset is 6:47 PM on September 1 and the earliest sunset is 28 minutes earlier at 6:20 PM on September 30.

Daylight saving time is not observed in Waipio during 2018.

For reference, on June 21, the longest day of the year, the Sun rises at 5:50 AM and sets 13 hours, 26 minutes later, at 7:17 PM, while on December 21, the shortest day of the year, it rises at 7:05 AM and sets 10 hours, 50 minutes later, at 5:55 PM.

Sunrise & Sunset with Twilight in September

The solar day over the course of September. 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.


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 Waipio is gradually increasing during September, rising from 74% to 77% over the course of the month.

The highest chance of a muggy day during September is 77% on September 26.

For reference, on September 26, the muggiest day of the year, there are muggy conditions 77% of the time, while on March 9, the least muggy day of the year, there are muggy conditions 17% of the time.

Humidity Comfort Levels in September

Humidity Comfort Levels in September in Waipio181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%10%20%30%40%50%60%70%80%90%100%AugOctSep 2677%Sep 2677%Sep 174%Sep 174%Sep 1175%Sep 1175%oppressiveoppressivemuggymuggyhumidhumid
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 Waipio is decreasing during September, decreasing from 14.7 miles per hour to 13.7 miles per hour over the course of the month.

For reference, on July 3, the windiest day of the year, the daily average wind speed is 16.6 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 12.3 miles per hour.

Average Wind Speed in September

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 Waipio throughout September is predominantly from the east, with a peak proportion of 94% on September 3.

Wind Direction in September

Wind Direction in September in Waipio181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%AugOcteastnorthsouth
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).

Water Temperature

Waipio 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 Waipio is essentially constant during September, remaining around 80°F throughout.

The highest average surface water temperature during September is 80°F on September 22.

Average Water Temperature in September

Average Water Temperature in September in Waipio1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303077.5°F78.0°F78.5°F79.0°F79.5°F80.0°F80.5°F81.0°F81.5°F82.0°FAugOctSep 2280°FSep 2280°FSep 180°FSep 180°FSep 1180°FSep 1180°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Growing Season

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 Waipio 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 September

Time Spent in Various Temperature Bands and the Growing Season in September in Waipio181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AugOct100%Sep 16100%Sep 16comfortablewarmhot
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 Waipio are rapidly increasing during September, increasing by 814°F, from 5,893°F to 6,707°F, over the course of the month.

Growing Degree Days in September

The average growing degree days accumulated over the course of September, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

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 Waipio is gradually decreasing during September, falling by 0.8 kWh, from 7.0 kWh to 6.2 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in September

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 Waipio are 21.418 deg latitude, -157.999 deg longitude, and 413 ft elevation.

The topography within 2 miles of Waipio contains significant variations in elevation, with a maximum elevation change of 636 feet and an average elevation above sea level of 359 feet. Within 10 miles contains significant variations in elevation (3,415 feet). Within 50 miles also contains extreme variations in elevation (4,121 feet).

The area within 2 miles of Waipio is covered by artificial surfaces (54%), shrubs (21%), and trees (14%), within 10 miles by trees (40%) and artificial surfaces (26%), and within 50 miles by water (92%).

Data Sources

This report illustrates the typical weather in Waipio year round, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Waipio.

For each station, the records are corrected for the elevation difference between that station and Waipio 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 Waipio is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Waipio and a given station.

The stations contributing to this reconstruction are: Wheeler Army Airfield (26%, 8 kilometers, northwest); Honolulu International Airport (21%, 13 kilometers, southeast); Kalaeloa Airport (John Rodgers Field) (21%, 13 kilometers, southwest); Kalaeloa Airport (21%, 13 kilometers, southwest); and Marine Corps Air Station Kaneohe Bay (11%, 24 kilometers, east).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.


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.