Average Weather in September in Andorra la Vella Andorra
In Andorra la Vella, the month of September is characterized by falling daily high temperatures, with daily highs decreasing by 9°F, from 67°F to 58°F over the course of the month, and rarely exceeding 75°F or dropping below 48°F.
Daily low temperatures decrease by 6°F, from 45°F to 39°F, rarely falling below 32°F or exceeding 51°F.
For reference, on August 4, the hottest day of the year, temperatures in Andorra la Vella typically range from 49°F to 70°F, while on January 15, the coldest day of the year, they range from 21°F to 36°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 Andorra la Vella experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 41% to 54%.
The clearest day of the month is September 1, with clear, mostly clear, or partly cloudy conditions 60% of the time.
For reference, on November 1, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 60%, while on July 20, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.
Cloud Cover in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Andorra la Vella, the chance of a wet day over the course of September is gradually increasing, starting the month at 19% and ending it at 23%.
For reference, the year's highest daily chance of a wet day is 28% on May 8, and its lowest chance is 14% on July 14.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Andorra la Vella is gradually increasing, starting the month at 1.3 inches, when it rarely exceeds 2.4 inches or falls below 0.5 inches, and ending the month at 1.6 inches, when it rarely exceeds 2.9 inches or falls below 0.4 inches.
Average Monthly Rainfall in September
Over the course of September in Andorra la Vella, the length of the day is rapidly decreasing. From the start to the end of the month, the length of the day decreases by 1 hour, 22 minutes, implying an average daily decrease of 2 minutes, 50 seconds, and weekly decrease of 19 minutes, 48 seconds.
The shortest day of the month is September 30, with 11 hours, 47 minutes of daylight and the longest day is September 1, with 13 hours, 9 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Andorra la Vella is 7:18 AM on September 1 and the latest sunrise is 31 minutes later at 7:49 AM on September 30.
The latest sunset is 8:28 PM on September 1 and the earliest sunset is 51 minutes earlier at 7:36 PM on September 30.
Daylight saving time is observed in Andorra la Vella during 2017, but it neither starts nor ends during September, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:16 AM and sets 15 hours, 18 minutes later, at 9:34 PM, while on December 21, the shortest day of the year, it rises at 8:20 AM and sets 9 hours, 4 minutes later, at 5:23 PM.
Sunrise & Sunset with Twilight and Daylight Saving Time in September
The chance that a given day will be muggy in Andorra la Vella is essentially constant during September, remaining around 0% throughout.
Humidity Comfort Levels in September
The average hourly wind speed in Andorra la Vella is essentially constant during September, remaining within 0.2 miles per hour of 3.2 miles per hour throughout.
For reference, on April 6, the windiest day of the year, the daily average wind speed is 4.4 miles per hour, while on August 27, the calmest day of the year, the daily average wind speed is 2.9 miles per hour.
Average Wind Speed in September
Wind Direction in September
The average daily incident shortwave solar energy in Andorra la Vella is decreasing during September, falling by 1.5 kWh, from 5.8 kWh to 4.3 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 Andorra la Vella are 42.508 deg latitude, 1.521 deg longitude, and 5,289 ft elevation.
The topography within 2 miles of Andorra la Vella contains extreme variations in elevation, with a maximum elevation change of 4,390 feet and an average elevation above sea level of 4,830 feet. Within 10 miles also contains extreme variations in elevation (7,205 feet). Within 50 miles also contains extreme variations in elevation (10,459 feet).
The area within 2 miles of Andorra la Vella is covered by trees (76%) and cropland (24%), within 10 miles by trees (51%) and grassland (21%), and within 50 miles by trees (52%) and grassland (16%).
This report illustrates the typical weather in Andorra la Vella 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 Andorra la Vella.
For each station, the records are corrected for the elevation difference between that station and Andorra la Vella 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 Andorra la Vella is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Andorra la Vella and a given station.
The stations contributing to this reconstruction are: Saint-Girons - Antichan (30%, 65 kilometers, northwest); Carcassonne-Salvaza (20%, 102 kilometers, northeast); Perpignan–Rivesaltes Airport (18%, 114 kilometers, east); Aeroport de Girona - Costa Brava (18%, 123 kilometers, southeast); and Barcelona–El Prat Airport (15%, 142 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .