Average Weather in May in Wailua Hawaii, United States
Daily high temperatures increase by 2°F, from 80°F to 81°F, rarely falling below 77°F or exceeding 83°F.
Daily low temperatures increase by 2°F, from 71°F to 73°F, rarely falling below 66°F or exceeding 75°F.
For reference, on September 4, the hottest day of the year, temperatures in Wailua typically range from 75°F to 84°F, while on January 25, the coldest day of the year, they range from 67°F to 78°F.
Average High and Low Temperature in May
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May
The month of May in Wailua experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 33% to 28%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 72% of the time.
For reference, on October 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 42%, while on January 17, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 79%.
Cloud Cover Categories in May
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 Wailua, the chance of a wet day over the course of May is very rapidly decreasing, starting the month at 20% and ending it at 10%.
For reference, the year's highest daily chance of a wet day is 30% on December 24, and its lowest chance is 9% on June 4.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Wailua is rapidly decreasing, starting the month at 3.0 inches, when it rarely exceeds 9.8 inches or falls below 0.1 inches, and ending the month at 1.1 inches, when it rarely exceeds 3.1 inches.
Average Monthly Rainfall in May
Over the course of May in Wailua, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 25 minutes, implying an average daily increase of 50 seconds, and weekly increase of 5 minutes, 52 seconds.
The shortest day of the month is May 1, with 12 hours, 58 minutes of daylight and the longest day is May 31, with 13 hours, 23 minutes of daylight.
Hours of Daylight and Twilight in May
The latest sunrise of the month in Wailua is 6:05 AM on May 1 and the earliest sunrise is 12 minutes earlier at 5:53 AM on May 31.
The earliest sunset is 7:03 PM on May 1 and the latest sunset is 13 minutes later at 7:16 PM on May 31.
Daylight saving time is not observed in Wailua during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 5:54 AM and sets 13 hours, 29 minutes later, at 7:23 PM, while on December 21, the shortest day of the year, it rises at 7:11 AM and sets 10 hours, 47 minutes later, at 5:59 PM.
Sunrise & Sunset with Twilight in May
The chance that a given day will be muggy in Wailua is very rapidly increasing during May, rising from 56% to 81% over the course of the month.
For reference, on August 31, the muggiest day of the year, there are muggy conditions 98% of the time, while on February 18, the least muggy day of the year, there are muggy conditions 33% of the time.
Humidity Comfort Levels in May
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Wailua is gradually decreasing during May, decreasing from 14.7 miles per hour to 14.1 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 16.3 miles per hour, while on January 4, the calmest day of the year, the daily average wind speed is 12.8 miles per hour.
The lowest daily average wind speed during May is 13.7 miles per hour on May 19.
Average Wind Speed in May
Wind Direction in May
Wailua 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 Wailua is essentially constant during May, remaining within 1°F of 77°F throughout.
Average Water Temperature in May
Temperatures in Wailua 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 May
The average accumulated growing degree days in Wailua are rapidly increasing during May, increasing by 761°F, from 2,664°F to 3,425°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Wailua is essentially constant during May, remaining within 0.2 kWh of 7.4 kWh throughout.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Wailua are 22.053 deg latitude, -159.338 deg longitude, and 62 ft elevation.
The topography within 2 miles of Wailua contains very significant variations in elevation, with a maximum elevation change of 1,119 feet and an average elevation above sea level of 135 feet. Within 10 miles contains very significant variations in elevation (4,908 feet). Within 50 miles also contains extreme variations in elevation (5,240 feet).
The area within 2 miles of Wailua is covered by water (33%), artificial surfaces (21%), grassland (19%), and trees (13%), within 10 miles by water (48%) and trees (28%), and within 50 miles by water (93%).
This report illustrates the typical weather in Wailua 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Wailua.
For each station, the records are corrected for the elevation difference between that station and Wailua 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 Wailua is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Wailua and a given station.
The stations contributing to this reconstruction are: Lihue Airport (94%, 8 kilometers, south) and Kekaha, Pacific Missile Test Facility Barking Sands (6%, 46 kilometers, west).
Time zones for aiports and weather stations are provided by AskGeo.com .