Average Weather in September in Piñon Hills California, United States
Daily high temperatures decrease by 8°F, from 88°F to 79°F, rarely falling below 68°F or exceeding 95°F.
Daily low temperatures decrease by 8°F, from 60°F to 52°F, rarely falling below 45°F or exceeding 66°F.
For reference, on July 28, the hottest day of the year, temperatures in Piñon Hills typically range from 63°F to 90°F, while on December 26, the coldest day of the year, they range from 32°F to 53°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 Piñon Hills 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 46%, 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 Piñon Hills, 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 19% 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 Piñon Hills is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.9 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Piñon Hills, 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, 48 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 Piñon Hills 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 Piñon Hills 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, 28 minutes later, at 8:06 PM, while on December 21, the shortest day of the year, it rises at 6:53 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 Piñon Hills is essentially constant during September, remaining around 0% throughout.
For reference, on August 11, the muggiest day of the year, there are muggy conditions 0% of the time, while on September 11, 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 Piñon Hills is essentially constant during September, remaining within 0.1 miles per hour of 6.1 miles per hour throughout.
For reference, on April 11, the windiest day of the year, the daily average wind speed is 7.9 miles per hour, while on September 9, the calmest day of the year, the daily average wind speed is 6.0 miles per hour.
The lowest daily average wind speed during September is 6.0 miles per hour on September 9.
Average Wind Speed in September
Wind Direction in September
Piñon Hills 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 Piñon Hills is essentially constant during September, remaining within 1°F of 68°F throughout.
Average Water Temperature in September
The growing season in Piñon Hills typically lasts for 7.5 months (230 days), from around March 29 to around November 14, rarely starting before February 25 or after April 21, and rarely ending before October 26 or after December 6.
The month of September in Piñon Hills is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in September
The average accumulated growing degree days in Piñon Hills are rapidly increasing during September, increasing by 553°F, from 2,858°F to 3,411°F, over the course of the month.
Growing Degree Days in September
The average daily incident shortwave solar energy in Piñon Hills 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 Piñon Hills are 34.433 deg latitude, -117.647 deg longitude, and 4,242 ft elevation.
The topography within 2 miles of Piñon Hills contains very significant variations in elevation, with a maximum elevation change of 1,529 feet and an average elevation above sea level of 4,279 feet. Within 10 miles contains very significant variations in elevation (7,024 feet). Within 50 miles also contains extreme variations in elevation (10,787 feet).
The area within 2 miles of Piñon Hills is covered by shrubs (100%), within 10 miles by shrubs (86%) and trees (12%), and within 50 miles by shrubs (71%) and artificial surfaces (16%).
This report illustrates the typical weather in Piñon Hills 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 6 weather stations near enough to contribute to our estimation of the temperature and dew point in Piñon Hills.
For each station, the records are corrected for the elevation difference between that station and Piñon Hills 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 Piñon Hills is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Piñon Hills and a given station.
The stations contributing to this reconstruction are: Southern California Logistics Airport (29%, 29 kilometers, northeast); Ontario International Airport (9%, 41 kilometers, south); Mount Wilson (21%, 45 kilometers, southwest); Palmdale United States Air Force Plant 42 Airport (18%, 46 kilometers, northwest); San Bernardino International Airport (9%, 53 kilometers, southeast); and Edwards Air Force Base (14%, 56 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .