Average Weather in September in Oranjestad Aruba
Daily high temperatures are around 90°F, rarely falling below 87°F or exceeding 93°F. The highest daily average high temperature is 90°F on September 7.
Daily low temperatures are around 81°F, rarely falling below 78°F or exceeding 83°F. The highest daily average low temperature is 81°F on September 13.
For reference, on September 2, the hottest day of the year, temperatures in Oranjestad typically range from 81°F to 90°F, while on January 20, the coldest day of the year, they range from 77°F to 85°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 Oranjestad experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 76% to 81%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 24% of the time.
For reference, on October 8, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 82%, while on January 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 54%.
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 Oranjestad, the chance of a wet day over the course of September is gradually increasing, starting the month at 9% and ending it at 13%.
For reference, the year's highest daily chance of a wet day is 20% on November 25, and its lowest chance is 2% on March 22.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Oranjestad is gradually increasing, starting the month at 0.6 inches, when it rarely exceeds 1.9 inches, and ending the month at 1.1 inches, when it rarely exceeds 2.7 inches.
Average Monthly Rainfall in September
Over the course of September in Oranjestad, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 20 minutes, implying an average daily decrease of 41 seconds, and weekly decrease of 4 minutes, 48 seconds.
The shortest day of the month is September 30, with 12 hours, 1 minute of daylight and the longest day is September 1, with 12 hours, 21 minutes of daylight.
Hours of Daylight and Twilight in September
The latest sunrise of the month in Oranjestad is 6:29 AM on September 6 and the earliest sunrise is 10 seconds earlier at 6:29 AM on September 23.
The latest sunset is 6:50 PM on September 1 and the earliest sunset is 20 minutes earlier at 6:30 PM on September 30.
Daylight saving time is not observed in Oranjestad during 2018.
For reference, on June 21, the longest day of the year, the Sun rises at 6:16 AM and sets 12 hours, 52 minutes later, at 7:07 PM, while on December 21, the shortest day of the year, it rises at 6:56 AM and sets 11 hours, 23 minutes later, at 6:19 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Oranjestad is essentially constant during September, remaining around 100% throughout.
For reference, on January 2, the muggiest day of the year, there are muggy conditions 100% of the time, while on March 8, the least muggy day of the year, there are muggy conditions 100% 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 Oranjestad is decreasing during September, decreasing from 18.0 miles per hour to 16.4 miles per hour over the course of the month.
For reference, on June 16, the windiest day of the year, the daily average wind speed is 21.5 miles per hour, while on October 21, the calmest day of the year, the daily average wind speed is 15.3 miles per hour.
Average Wind Speed in September
Wind Direction in September
Oranjestad 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 Oranjestad is essentially constant during September, remaining around 83°F throughout.
The highest average surface water temperature during September is 83°F on September 30.
Average Water Temperature in September
Temperatures in Oranjestad 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 Oranjestad are very rapidly increasing during September, increasing by 979°F, from 7,798°F to 8,777°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Oranjestad is gradually decreasing during September, falling by 0.7 kWh, from 4.8 kWh to 4.2 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 Oranjestad are 12.524 deg latitude, -70.027 deg longitude, and 36 ft elevation.
The topography within 2 miles of Oranjestad contains only modest variations in elevation, with a maximum elevation change of 194 feet and an average elevation above sea level of 49 feet. Within 10 miles contains only modest variations in elevation (659 feet). Within 50 miles contains significant variations in elevation (2,575 feet).
The area within 2 miles of Oranjestad is covered by artificial surfaces (51%), water (28%), and grassland (11%), within 10 miles by water (84%), and within 50 miles by water (92%).
This report illustrates the typical weather in Oranjestad 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, Queen Beatrix International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Oranjestad.
At a distance of 3 kilometers from Oranjestad, 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 Oranjestad 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 .