Average Weather in September in Haveluloto Tonga
Daily high temperatures are around 77°F, rarely falling below 73°F or exceeding 82°F.
Daily low temperatures are around 67°F, rarely falling below 61°F or exceeding 72°F.
For reference, on February 13, the hottest day of the year, temperatures in Haveluloto typically range from 76°F to 85°F, while on August 23, the coldest day of the year, they range from 66°F to 76°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 Haveluloto experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 42% throughout the month.
The clearest day of the month is September 6, with clear, mostly clear, or partly cloudy conditions 60% of the time.
For reference, on February 25, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 71%, while on August 9, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 62%.
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 Haveluloto, the chance of a wet day over the course of September is essentially constant, remaining around 22% throughout.
For reference, the year's highest daily chance of a wet day is 42% on April 3, and its lowest chance is 16% on June 30.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Haveluloto is essentially constant, remaining about 2.6 inches throughout, and rarely exceeding 5.1 inches or falling below 0.5 inches.
Average Monthly Rainfall in September
Over the course of September in Haveluloto, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 34 minutes, implying an average daily increase of 1 minute, 11 seconds, and weekly increase of 8 minutes, 19 seconds.
The shortest day of the month is September 1, with 11 hours, 42 minutes of daylight and the longest day is September 30, with 12 hours, 17 minutes of daylight.
Hours of Daylight and Twilight in September
The latest sunrise of the month in Haveluloto is 6:49 AM on September 1 and the earliest sunrise is 27 minutes earlier at 6:22 AM on September 30.
The earliest sunset is 6:31 PM on September 1 and the latest sunset is 7 minutes later at 6:39 PM on September 30.
Daylight saving time is observed in Haveluloto during 2018, but it neither starts nor ends during September, so the entire month is in standard time.
For reference, on December 21, the longest day of the year, the Sun rises at 6:56 AM and sets 13 hours, 25 minutes later, at 8:21 PM, while on June 21, the shortest day of the year, it rises at 7:17 AM and sets 10 hours, 51 minutes later, at 6:08 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Haveluloto is rapidly increasing during September, rising from 39% to 51% over the course of the month.
For reference, on February 13, the muggiest day of the year, there are muggy conditions 100% of the time, while on August 24, the least muggy day of the year, there are muggy conditions 36% 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 Haveluloto is essentially constant during September, remaining within 0.2 miles per hour of 14.3 miles per hour throughout.
For reference, on April 26, the windiest day of the year, the daily average wind speed is 15.4 miles per hour, while on February 17, the calmest day of the year, the daily average wind speed is 13.5 miles per hour.
Average Wind Speed in September
Wind Direction in September
Haveluloto 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 Haveluloto is essentially constant during September, remaining around 75°F throughout.
Average Water Temperature in September
Temperatures in Haveluloto 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 Haveluloto are rapidly increasing during September, increasing by 626°F, from 1,296°F to 1,922°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Haveluloto is gradually increasing during September, rising by 0.9 kWh, from 4.9 kWh to 5.8 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 Haveluloto are -21.152 deg latitude, -175.213 deg longitude, and 20 ft elevation.
The topography within 2 miles of Haveluloto is essentially flat, with a maximum elevation change of 92 feet and an average elevation above sea level of 20 feet. Within 10 miles is essentially flat (253 feet). Within 50 miles contains only modest variations in elevation (1,030 feet).
The area within 2 miles of Haveluloto is covered by water (88%), within 10 miles by water (84%) and trees (11%), and within 50 miles by water (99%).
This report illustrates the typical weather in Haveluloto 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 is only a single weather station, Fuaʻamotu International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Haveluloto.
At a distance of 11 kilometers from Haveluloto, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and Haveluloto according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for aiports and weather stations are provided by AskGeo.com .