Average Weather in September in Makakilo Hawaii, United States
Daily high temperatures are around 87°F, rarely falling below 84°F or exceeding 90°F.
Daily low temperatures are around 72°F, rarely falling below 69°F or exceeding 75°F.
For reference, on August 21, the hottest day of the year, temperatures in Makakilo typically range from 73°F to 87°F, while on January 31, the coldest day of the year, they range from 65°F to 80°F.
Average High and Low Temperature in September
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
The month of September in Makakilo 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 72% 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
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Makakilo, the chance of a wet day over the course of September is essentially constant, remaining around 12% throughout.
For reference, the year's highest daily chance of a wet day is 25% on January 11, and its lowest chance is 7% on June 20.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Makakilo is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.7 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Makakilo, 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, 12 seconds, and weekly decrease of 8 minutes, 26 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
The earliest sunrise of the month in Makakilo is 6:15 AM on September 1 and the latest sunrise is 7 minutes later at 6:23 AM on September 30.
The latest sunset is 6:48 PM on September 1 and the earliest sunset is 27 minutes earlier at 6:20 PM on September 30.
Daylight saving time is not observed in Makakilo during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:51 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 chance that a given day will be muggy in Makakilo is gradually increasing during September, rising from 62% to 65% over the course of the month.
For reference, on October 10, the muggiest day of the year, there are muggy conditions 66% of the time, while on March 30, the least muggy day of the year, there are muggy conditions 17% of the time.
Humidity Comfort Levels in September
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Makakilo is decreasing during September, decreasing from 14.5 miles per hour to 13.5 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 16.4 miles per hour, while on January 10, the calmest day of the year, the daily average wind speed is 12.2 miles per hour.
Average Wind Speed in September
Wind Direction in September
Makakilo 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 Makakilo 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
Temperatures in Makakilo 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
The average accumulated growing degree days in Makakilo are rapidly increasing during September, increasing by 832°F, from 6,106°F to 6,937°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Makakilo 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
For the purposes of this report, the geographical coordinates of Makakilo are 21.352 deg latitude, -158.087 deg longitude, and 197 ft elevation.
The topography within 2 miles of Makakilo contains very significant variations in elevation, with a maximum elevation change of 1,719 feet and an average elevation above sea level of 511 feet. Within 10 miles contains very 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 Makakilo is covered by shrubs (42%), artificial surfaces (37%), and grassland (14%), within 10 miles by water (49%) and artificial surfaces (21%), and within 50 miles by water (92%).
This report illustrates the typical weather in Makakilo 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Makakilo.
For each station, the records are corrected for the elevation difference between that station and Makakilo 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 Makakilo is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Makakilo and a given station.
The stations contributing to this reconstruction are: Kalaeloa Airport (John Rodgers Field) (47%, 4.4 kilometers, southeast); Kalaeloa Airport (47%, 4.4 kilometers, southeast); and Wheeler Army Airfield (6%, 16 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .