Average Weather in August in San Fernando California, United States
Daily high temperatures are around 91°F, rarely falling below 81°F or exceeding 100°F. The highest daily average high temperature is 92°F on August 22.
Daily low temperatures are around 65°F, rarely falling below 59°F or exceeding 72°F. The highest daily average low temperature is 65°F on August 23.
For reference, on August 20, the hottest day of the year, temperatures in San Fernando typically range from 65°F to 92°F, while on December 25, the coldest day of the year, they range from 45°F to 64°F.
Average High and Low Temperature in August
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on August. 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 August
The month of August in San Fernando experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 9% throughout the month.
The clearest day of the month is August 23, with clear, mostly clear, or partly cloudy conditions 91% of the time.
For reference, on February 22, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 44%, while on September 7, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 91%.
Cloud Cover Categories in August
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The average sliding 31-day rainfall during August in San Fernando is essentially constant, remaining about 0.0 inches throughout, and rarely exceeding 0.2 inches or falling below -0.0 inches.
Average Monthly Rainfall in August
Over the course of August in San Fernando, the length of the day is decreasing. From the start to the end of the month, the length of the day decreases by 56 minutes, implying an average daily decrease of 1 minute, 51 seconds, and weekly decrease of 13 minutes, 0 seconds.
The shortest day of the month is August 31, with 12 hours, 54 minutes of daylight and the longest day is August 1, with 13 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in San Fernando is 6:04 AM on August 1 and the latest sunrise is 22 minutes later at 6:26 AM on August 31.
The latest sunset is 7:54 PM on August 1 and the earliest sunset is 34 minutes earlier at 7:20 PM on August 31.
Daylight saving time is observed in San Fernando during 2018, but it neither starts nor ends during August, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:42 AM and sets 14 hours, 27 minutes later, at 8:09 PM, while on December 21, the shortest day of the year, it rises at 6:56 AM and sets 9 hours, 52 minutes later, at 4:47 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in San Fernando is essentially constant during August, remaining around 2% throughout.
For reference, on August 5, the muggiest day of the year, there are muggy conditions 2% 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 August
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in San Fernando is essentially constant during August, remaining around 5.3 miles per hour throughout.
For reference, on December 31, the windiest day of the year, the daily average wind speed is 9.0 miles per hour, while on August 14, the calmest day of the year, the daily average wind speed is 5.3 miles per hour.
The lowest daily average wind speed during August is 5.3 miles per hour on August 15.
Average Wind Speed in August
Wind Direction in August
San Fernando 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 San Fernando is essentially constant during August, remaining around 68°F throughout.
The highest average surface water temperature during August is 68°F on August 23.
Average Water Temperature in August
Temperatures in San Fernando 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 August
The average accumulated growing degree days in San Fernando are rapidly increasing during August, increasing by 756°F, from 2,806°F to 3,562°F, over the course of the month.
Growing Degree Days in August
The average daily incident shortwave solar energy in San Fernando is gradually decreasing during August, falling by 0.9 kWh, from 8.0 kWh to 7.1 kWh, over the course of the month.
Average Daily Incident Shortwave Solar Energy in August
For the purposes of this report, the geographical coordinates of San Fernando are 34.282 deg latitude, -118.439 deg longitude, and 1,086 ft elevation.
The topography within 2 miles of San Fernando contains significant variations in elevation, with a maximum elevation change of 522 feet and an average elevation above sea level of 1,079 feet. Within 10 miles contains significant variations in elevation (4,295 feet). Within 50 miles also contains extreme variations in elevation (10,062 feet).
The area within 2 miles of San Fernando is covered by artificial surfaces (69%) and shrubs (31%), within 10 miles by shrubs (52%) and artificial surfaces (44%), and within 50 miles by shrubs (43%) and artificial surfaces (20%).
This report illustrates the typical weather in San Fernando 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 San Fernando.
For each station, the records are corrected for the elevation difference between that station and San Fernando 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 San Fernando is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between San Fernando and a given station.
The stations contributing to this reconstruction are: Van Nuys Airport (39%, 9 kilometers, southwest); Burbank Bob Hope Airport (33%, 12 kilometers, southeast); Newhall (25%, 16 kilometers, northwest); and Palmdale United States Air Force Plant 42 Airport (3.5%, 51 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .