Average Weather in September in Vandenberg Village California, United States
In Vandenberg Village, the month of September is characterized by essentially constant daily high temperatures, with daily highs around 71°F throughout the month, rarely exceeding 81°F or dropping below 65°F.
Daily low temperatures decrease by 2°F, from 55°F to 53°F, rarely falling below 47°F or exceeding 59°F.
For reference, on October 2, the hottest day of the year, temperatures in Vandenberg Village typically range from 53°F to 71°F, while on December 23, the coldest day of the year, they range from 41°F to 62°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 Vandenberg Village experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 8% to 13%.
The clearest day of the month is September 7, with clear, mostly clear, or partly cloudy conditions 92% of the time.
For reference, on February 23, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on August 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 93%.
Cloud Cover in September
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Vandenberg Village, the chance of a wet day over the course of September is gradually increasing, starting the month at 1% and ending it at 3%.
For reference, the year's highest daily chance of a wet day is 23% on February 20, and its lowest chance is 0% on July 29.
Probability of Precipitation in September
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during September in Vandenberg Village is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.7 inches or falling below -0.0 inches.
Average Monthly Rainfall in September
Over the course of September in Vandenberg Village, 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, 2 minutes, implying an average daily decrease of 2 minutes, 8 seconds, and weekly decrease of 14 minutes, 57 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 Vandenberg Village is 6:35 AM on September 1 and the latest sunrise is 21 minutes later at 6:56 AM on September 30.
The latest sunset is 7:27 PM on September 1 and the earliest sunset is 41 minutes earlier at 6:46 PM on September 30.
Daylight saving time is observed in Vandenberg Village 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 5:49 AM and sets 14 hours, 29 minutes later, at 8:18 PM, while on December 21, the shortest day of the year, it rises at 7:05 AM and sets 9 hours, 50 minutes later, at 4:55 PM.
Sunrise & Sunset with Twilight in September
We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.
The chance that a given day will be muggy in Vandenberg Village is essentially constant during September, remaining around 0% throughout.
For reference, on July 14, 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
This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.
The average hourly wind speed in Vandenberg Village is essentially constant during September, remaining within 0.1 miles per hour of 4.8 miles per hour throughout.
For reference, on May 24, the windiest day of the year, the daily average wind speed is 6.2 miles per hour, while on October 24, the calmest day of the year, the daily average wind speed is 4.7 miles per hour.
Average Wind Speed in September
Wind Direction in September
Vandenberg Village 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 Vandenberg Village is essentially constant during September, remaining around 61°F throughout.
The highest average surface water temperature during September is 61°F on September 26.
Average Water Temperature in September
This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.
The average daily incident shortwave solar energy in Vandenberg Village is decreasing during September, falling by 1.4 kWh, from 7.1 kWh to 5.7 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 Vandenberg Village are 34.708 deg latitude, -120.468 deg longitude, and 364 ft elevation.
The topography within 2 miles of Vandenberg Village contains very significant variations in elevation, with a maximum elevation change of 840 feet and an average elevation above sea level of 378 feet. Within 10 miles contains very significant variations in elevation (2,011 feet). Within 50 miles contains large variations in elevation (6,814 feet).
The area within 2 miles of Vandenberg Village is covered by shrubs (35%), cropland (26%), grassland (21%), and artificial surfaces (17%), within 10 miles by grassland (43%) and shrubs (21%), and within 50 miles by water (54%) and shrubs (20%).
This report illustrates the typical weather in Vandenberg Village 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Vandenberg Village.
For each station, the records are corrected for the elevation difference between that station and Vandenberg Village 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 Vandenberg Village is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Vandenberg Village and a given station.
The stations contributing to this reconstruction are: Lompoc Airport (29%, 4.6 kilometers, south); Lompoc, Vandenberg Air Force Base (31%, 9 kilometers, west); Vandenberg Range (31%, 9 kilometers, west); and Santa Maria Airport (9%, 21 kilometers, north).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.