Average Weather in July in San Francisco Costa Rica
In San Francisco, the month of July is characterized by essentially constant daily high temperatures, with daily highs around 79°F throughout the month, rarely exceeding 82°F or dropping below 75°F. The lowest daily average high temperature is 78°F on July 8.
Daily low temperatures are around 65°F, rarely falling below 62°F or exceeding 68°F. The highest daily average low temperature is 65°F on July 13.
For reference, on April 7, the hottest day of the year, temperatures in San Francisco typically range from 65°F to 82°F, while on September 21, the coldest day of the year, they range from 64°F to 78°F.
Average High and Low Temperature in July
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on July. 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 July
The month of July in San Francisco experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 93% throughout the month.
The clearest day of the month is July 31, with clear, mostly clear, or partly cloudy conditions 8% of the time.
For reference, on June 5, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 95%, while on January 2, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 64%.
Cloud Cover Categories in July
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Francisco, the chance of a wet day over the course of July is decreasing, starting the month at 42% and ending it at 37%.
For reference, the year's highest daily chance of a wet day is 51% on October 7, and its lowest chance is 6% on March 16.
Probability of Precipitation in July
The average sliding 31-day rainfall during July in San Francisco is gradually decreasing, starting the month at 4.8 inches, when it rarely exceeds 8.3 inches or falls below 1.7 inches, and ending the month at 4.5 inches, when it rarely exceeds 8.8 inches or falls below 2.0 inches.
The lowest average 31-day accumulation is 4.4 inches on July 23.
Average Monthly Rainfall in July
Over the course of July in San Francisco, the length of the day is essentially constant. The shortest day of the month is July 31, with 12 hours, 34 minutes of daylight and the longest day is July 1, with 12 hours, 42 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in San Francisco is 5:19 AM on July 1 and the latest sunrise is 7 minutes later at 5:26 AM on July 31.
The latest sunset is 6:02 PM on July 11 and the earliest sunset is 2 minutes, 31 seconds earlier at 5:59 PM on July 31.
Daylight saving time is not observed in San Francisco during 2017.
For reference, on June 21, the longest day of the year, the Sun rises at 5:17 AM and sets 12 hours, 43 minutes later, at 5:59 PM, while on December 21, the shortest day of the year, it rises at 5:48 AM and sets 11 hours, 33 minutes later, at 5:21 PM.
Sunrise & Sunset with Twilight in July
The chance that a given day will be muggy in San Francisco is decreasing during July, falling from 46% to 39% over the course of the month.
The lowest chance of a muggy day during July is 39% on July 19.
For reference, on June 4, the muggiest day of the year, there are muggy conditions 60% of the time, while on January 24, the least muggy day of the year, there are muggy conditions 3% of the time.
Humidity Comfort Levels in July
The average hourly wind speed in San Francisco is essentially constant during July, remaining within 0.1 miles per hour of 2.3 miles per hour throughout.
For reference, on February 5, the windiest day of the year, the daily average wind speed is 4.0 miles per hour, while on September 18, the calmest day of the year, the daily average wind speed is 1.9 miles per hour.
The highest daily average wind speed during July is 2.3 miles per hour on July 17.
Average Wind Speed in July
Wind Direction in July
San Francisco 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 Francisco is essentially constant during July, remaining around 83°F throughout.
The lowest average surface water temperature during July is 83°F on July 30.
Average Water Temperature in July
Temperatures in San Francisco 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 July
The average accumulated growing degree days in San Francisco is rapidly increasing during July, increasing by 608°F, from 3,787°F to 4,396°F, over the course of the month.
Growing Degree Days in July
The average daily incident shortwave solar energy in San Francisco is essentially constant during July, remaining within 0.1 kWh of 4.0 kWh throughout.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of San Francisco are 9.993 deg latitude, -84.129 deg longitude, and 3,583 ft elevation.
The topography within 2 miles of San Francisco contains very significant variations in elevation, with a maximum elevation change of 846 feet and an average elevation above sea level of 3,599 feet. Within 10 miles contains very significant variations in elevation (7,510 feet). Within 50 miles also contains extreme variations in elevation (11,447 feet).
The area within 2 miles of San Francisco is covered by grassland (71%) and trees (26%), within 10 miles by grassland (46%) and trees (39%), and within 50 miles by trees (54%) and grassland (17%).
This report illustrates the typical weather in San Francisco 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 is only a single weather station, Juan Santamaría International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Francisco.
At a distance of 9 kilometers from San Francisco, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.
The station records are corrected for the elevation difference between the station and San Francisco according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.
Time zones for aiports and weather stations are provided by AskGeo.com .