Average Weather in July in San Antonio Mexico
Daily high temperatures are around 76°F, rarely falling below 71°F or exceeding 81°F.
Daily low temperatures are around 56°F, rarely falling below 53°F or exceeding 60°F.
For reference, on May 12, the hottest day of the year, temperatures in San Antonio typically range from 54°F to 83°F, while on January 8, the coldest day of the year, they range from 40°F to 71°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 Antonio experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 87% throughout the month.
The clearest day of the month is July 31, with clear, mostly clear, or partly cloudy conditions 14% of the time.
For reference, on September 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 90%, while on February 22, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 65%.
Cloud Cover Categories in July
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In San Antonio, the chance of a wet day over the course of July is essentially constant, remaining around 73% throughout.
For reference, the year's highest daily chance of a wet day is 75% on August 26, and its lowest chance is 1% on April 5.
Probability of Precipitation in July
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 July in San Antonio is essentially constant, remaining about 5.8 inches throughout, and rarely exceeding 10.3 inches or falling below 2.4 inches.
The highest average 31-day accumulation is 6.0 inches on July 9.
Average Monthly Rainfall in July
Over the course of July in San Antonio, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 17 minutes, implying an average daily decrease of 33 seconds, and weekly decrease of 3 minutes, 54 seconds.
The shortest day of the month is July 31, with 13 hours, 1 minute of daylight and the longest day is July 1, with 13 hours, 18 minutes of daylight.
Hours of Daylight and Twilight in July
The earliest sunrise of the month in San Antonio is 7:09 AM on July 1 and the latest sunrise is 11 minutes later at 7:20 AM on July 31.
The latest sunset is 8:28 PM on July 4 and the earliest sunset is 6 minutes earlier at 8:21 PM on July 31.
Daylight saving time is observed in San Antonio during 2018, but it neither starts nor ends during July, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 7:07 AM and sets 13 hours, 19 minutes later, at 8:26 PM, while on December 21, the shortest day of the year, it rises at 7:14 AM and sets 10 hours, 57 minutes later, at 6:11 PM.
Sunrise & Sunset with Twilight in July
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 San Antonio is essentially constant during July, remaining around 1% throughout.
The highest chance of a muggy day during July is 1% on July 11.
For reference, on July 11, the muggiest day of the year, there are muggy conditions 1% 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 July
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 San Antonio is essentially constant during July, remaining within 0.2 miles per hour of 4.0 miles per hour throughout.
For reference, on March 29, the windiest day of the year, the daily average wind speed is 5.7 miles per hour, while on July 29, the calmest day of the year, the daily average wind speed is 3.9 miles per hour.
The lowest daily average wind speed during July is 3.9 miles per hour on July 29.
Average Wind Speed in July
Wind Direction in July
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
While it does not do so every year, freezing temperatures are seen in San Antonio over some winters. The day least likely to be in the growing season is January 12, with a 57% chance.
Time Spent in Various Temperature Bands and the Growing Season in July
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
The average accumulated growing degree days in San Antonio are increasing during July, increasing by 439°F, from 2,500°F to 2,939°F, over the course of the month.
Growing Degree Days in July
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 San Antonio is essentially constant during July, remaining within 0.1 kWh of 5.4 kWh throughout.
The lowest average daily incident shortwave solar energy during July is 5.4 kWh on July 7.
Average Daily Incident Shortwave Solar Energy in July
For the purposes of this report, the geographical coordinates of San Antonio are 19.667 deg latitude, -101.268 deg longitude, and 6,332 ft elevation.
The topography within 2 miles of San Antonio contains only modest variations in elevation, with a maximum elevation change of 387 feet and an average elevation above sea level of 6,251 feet. Within 10 miles contains only modest variations in elevation (4,032 feet). Within 50 miles also contains extreme variations in elevation (10,217 feet).
The area within 2 miles of San Antonio is covered by cropland (61%), shrubs (19%), and trees (19%), within 10 miles by trees (42%) and shrubs (36%), and within 50 miles by trees (53%) and shrubs (24%).
This report illustrates the typical weather in San Antonio 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, General Francisco J. Mujica International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of San Antonio.
At a distance of 33 kilometers from San Antonio, 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 Antonio 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.
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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.