Average Weather in September in Wrightwood California, United States
Daily high temperatures decrease by 8°F, from 81°F to 73°F, rarely falling below 60°F or exceeding 88°F.
Daily low temperatures decrease by 7°F, from 57°F to 49°F, rarely falling below 40°F or exceeding 63°F.
For reference, on August 2, the hottest day of the year, temperatures in Wrightwood typically range from 59°F to 83°F, while on December 23, the coldest day of the year, they range from 29°F to 48°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 Wrightwood experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 12% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 10% on September 7.
The clearest day of the month is September 7, with clear, mostly clear, or partly cloudy conditions 90% of the time.
For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 90%.
Cloud Cover Categories in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Wrightwood, the chance of a wet day over the course of September is essentially constant, remaining around 3% throughout.
For reference, the year's highest daily chance of a wet day is 18% on February 20, and its lowest chance is 0% on June 21.
Probability of Precipitation in September
The average sliding 31-day rainfall during September in Wrightwood is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 1.0 inches.
Average Monthly Rainfall in September
Over the course of September in Wrightwood, 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, 1 minute, implying an average daily decrease of 2 minutes, 7 seconds, and weekly decrease of 14 minutes, 46 seconds.
The shortest day of the month is September 30, with 11 hours, 51 minutes of daylight and the longest day is September 1, with 12 hours, 53 minutes of daylight.
Hours of Daylight and Twilight in September
The earliest sunrise of the month in Wrightwood is 6:23 AM on September 1 and the latest sunrise is 21 minutes later at 6:44 AM on September 30.
The latest sunset is 7:16 PM on September 1 and the earliest sunset is 41 minutes earlier at 6:35 PM on September 30.
Daylight saving time is observed in Wrightwood during 2018, 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 5:38 AM and sets 14 hours, 27 minutes later, at 8:06 PM, while on December 21, the shortest day of the year, it rises at 6:52 AM and sets 9 hours, 51 minutes later, at 4:44 PM.
Sunrise & Sunset with Twilight in September
The chance that a given day will be muggy in Wrightwood is essentially constant during September, remaining around 0% throughout.
For reference, on August 20, the muggiest day of the year, there are muggy conditions 0% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in September
The average hourly wind speed in Wrightwood is essentially constant during September, remaining within 0.1 miles per hour of 5.8 miles per hour throughout.
For reference, on December 31, the windiest day of the year, the daily average wind speed is 7.8 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.
The lowest daily average wind speed during September is 5.7 miles per hour on September 9.
Average Wind Speed in September
Wind Direction in September
Wrightwood 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 Wrightwood is essentially constant during September, remaining within 1°F of 68°F throughout.
Average Water Temperature in September
The growing season in Wrightwood typically lasts for 5.9 months (180 days), from around May 5 to around November 1, rarely starting before April 9 or after June 2, and rarely ending before October 6 or after November 25.
The month of September in Wrightwood is very likely fully within the growing season, with the chance that a given day is in the growing season gradually decreasing from 100% to 95% over the course of the month.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Wrightwood are increasing during September, increasing by 421°F, from 2,099°F to 2,520°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Wrightwood is decreasing during September, falling by 1.2 kWh, from 7.1 kWh to 5.9 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 Wrightwood are 34.361 deg latitude, -117.633 deg longitude, and 6,345 ft elevation.
The topography within 2 miles of Wrightwood contains extreme variations in elevation, with a maximum elevation change of 3,438 feet and an average elevation above sea level of 6,352 feet. Within 10 miles also contains extreme variations in elevation (7,848 feet). Within 50 miles also contains extreme variations in elevation (11,490 feet).
The area within 2 miles of Wrightwood is covered by shrubs (57%) and trees (41%), within 10 miles by shrubs (80%) and trees (18%), and within 50 miles by shrubs (68%) and artificial surfaces (18%).
This report illustrates the typical weather in Wrightwood 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 Wrightwood.
For each station, the records are corrected for the elevation difference between that station and Wrightwood 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 Wrightwood is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Wrightwood and a given station.
The stations contributing to this reconstruction are: Ontario International Airport (8%, 33 kilometers, south); Southern California Logistics Airport (15%, 34 kilometers, northeast); Mount Wilson (56%, 42 kilometers, west); San Bernardino International Airport (8%, 47 kilometers, southeast); and Palmdale United States Air Force Plant 42 Airport (12%, 51 kilometers, northwest).
Time zones for aiports and weather stations are provided by AskGeo.com .