Average Weather in August in Portola California, United States
In Portola, the month of August is characterized by gradually falling daily high temperatures, with daily highs decreasing by 4°F, from 84°F to 80°F over the course of the month, and rarely exceeding 91°F or dropping below 71°F. The highest daily average high temperature is 84°F on August 3.
Daily low temperatures decrease by 4°F, from 54°F to 50°F, rarely falling below 43°F or exceeding 61°F.
For reference, on August 3, the hottest day of the year, temperatures in Portola typically range from 54°F to 84°F, while on December 31, the coldest day of the year, they range from 25°F to 41°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 Portola experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 13% throughout the month.
The clearest day of the month is August 1, with clear, mostly clear, or partly cloudy conditions 89% of the time.
For reference, on March 2, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on July 29, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 89%.
Cloud Cover in August
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Portola, the chance of a wet day over the course of August is essentially constant, remaining around 2% throughout.
For reference, the year's highest daily chance of a wet day is 35% on March 1, and its lowest chance is 2% on August 13.
Probability of Precipitation in August
The average sliding 31-day rainfall during August in Portola is essentially constant, remaining about 0.2 inches throughout, and rarely exceeding 0.8 inches or falling below -0.0 inches.
Average Monthly Rainfall in August
Over the course of August in Portola, 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, 9 minutes, implying an average daily decrease of 2 minutes, 18 seconds, and weekly decrease of 16 minutes, 3 seconds.
The shortest day of the month is August 31, with 13 hours, 5 minutes of daylight and the longest day is August 1, with 14 hours, 14 minutes of daylight.
Hours of Daylight and Twilight in August
The earliest sunrise of the month in Portola is 6:01 AM on August 1 and the latest sunrise is 28 minutes later at 6:29 AM on August 31.
The latest sunset is 8:14 PM on August 1 and the earliest sunset is 41 minutes earlier at 7:34 PM on August 31.
Daylight saving time is observed in Portola during 2017, 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 5:33 AM and sets 14 hours, 60 minutes later, at 8:33 PM, while on December 21, the shortest day of the year, it rises at 7:19 AM and sets 9 hours, 21 minutes later, at 4:40 PM.
Sunrise & Sunset with Twilight in August
The chance that a given day will be muggy in Portola is essentially constant during August, remaining around 0% throughout.
Humidity Comfort Levels in August
The average hourly wind speed in Portola is essentially constant during August, remaining around 2.4 miles per hour throughout.
For reference, on March 21, the windiest day of the year, the daily average wind speed is 3.1 miles per hour, while on August 6, the calmest day of the year, the daily average wind speed is 2.4 miles per hour.
The lowest daily average wind speed during August is 2.4 miles per hour on August 6.
Average Wind Speed in August
Wind Direction in August
The average daily incident shortwave solar energy in Portola is decreasing during August, falling by 1.2 kWh, from 8.1 kWh to 6.9 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 Portola are 39.810 deg latitude, -120.469 deg longitude, and 5,105 ft elevation.
The topography within 2 miles of Portola contains very significant variations in elevation, with a maximum elevation change of 928 feet and an average elevation above sea level of 5,067 feet. Within 10 miles contains very significant variations in elevation (3,376 feet). Within 50 miles also contains extreme variations in elevation (10,062 feet).
The area within 2 miles of Portola is covered by shrubs (68%) and trees (31%), within 10 miles by trees (52%) and shrubs (33%), and within 50 miles by trees (51%) and shrubs (42%).
This report illustrates the typical weather in Portola 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 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Portola.
For each station, the records are corrected for the elevation difference between that station and Portola 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 Portola is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Portola and a given station.
The stations contributing to this reconstruction are: Truckee Tahoe Airport (34%, 62 kilometers, southeast); Blue Canyon-Nyack Airport (37%, 63 kilometers, south); and Reno/Tahoe International Airport (29%, 70 kilometers, southeast).
Time zones for aiports and weather stations are provided by AskGeo.com .