Summer Weather in Austin Texas, United States
Daily high temperatures increase by 5°F, from 89°F to 94°F, rarely falling below 83°F or exceeding 102°F. The highest daily average high temperature is 97°F on August 6.
Daily low temperatures are around 73°F, rarely falling below 65°F or exceeding 78°F. The highest daily average low temperature is 75°F on August 11.
For reference, on August 6, the hottest day of the year, temperatures in Austin typically range from 75°F to 97°F, while on January 6, the coldest day of the year, they range from 43°F to 61°F.
Average High and Low Temperature in the Summer in Austin
The figure below shows you a compact characterization of the hourly average summer temperatures. 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 the Summer in Austin
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The summer in Austin experiences increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 31% to 40%. The highest chance of overcast or mostly cloudy conditions is 41% on August 20. The lowest chance of overcast or mostly cloudy conditions is 28% on June 13.
The clearest day of the summer is June 13, with clear, mostly clear, or partly cloudy conditions 72% of the time.
For reference, on January 3, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 45%, while on June 13, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.
Cloud Cover Categories in the Summer in Austin
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Austin, the chance of a wet day over the course of the summer is very rapidly decreasing, starting the season at 33% and ending it at 25%.
For reference, the year's highest daily chance of a wet day is 35% on May 27, and its lowest chance is 14% on January 1.
Probability of Precipitation in the Summer in Austin
To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during the summer in Austin is rapidly decreasing, starting the season at 3.8 inches, when it rarely exceeds 7.9 inches or falls below 1.1 inches, and ending the season at 2.2 inches, when it rarely exceeds 5.0 inches or falls below 0.3 inches.
The lowest average 31-day accumulation is 1.3 inches on August 1.
Average Monthly Rainfall in the Summer in Austin
Over the course of the summer in Austin, the length of the day is rapidly decreasing. From the start to the end of the season, the length of the day decreases by 1 hour, 12 minutes, implying an average daily decrease of 47 seconds, and weekly decrease of 5 minutes, 31 seconds.
The shortest day of the summer is August 31, with 12 hours, 47 minutes of daylight and the longest day is June 20, with 14 hours, 6 minutes of daylight.
Hours of Daylight and Twilight in the Summer in Austin
The earliest sunrise of the summer in Austin is 6:28 AM on June 10 and the latest sunrise is 39 minutes later at 7:07 AM on August 31.
The latest sunset is 8:36 PM on June 30 and the earliest sunset is 42 minutes earlier at 7:54 PM on August 31.
Daylight saving time is observed in Austin during 2021, but it neither starts nor ends during the summer, so the entire season is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 6:29 AM and sets 14 hours, 6 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:23 AM and sets 10 hours, 12 minutes later, at 5:35 PM.
Sunrise & Sunset with Twilight in the Summer in Austin
The figure below presents a compact representation of key lunar data for the summer of 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.
Moon Rise, Set & Phases in the Summer in Austin
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 Austin is increasing during the summer, rising from 74% to 80% over the course of the season.
The highest chance of a muggy day during the summer is 89% on July 3.
For reference, on July 3, the muggiest day of the year, there are muggy conditions 89% of the time, while on January 21, the least muggy day of the year, there are muggy conditions 2% of the time.
Humidity Comfort Levels in the Summer in Austin
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
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 Austin is decreasing during the summer, decreasing from 9.7 miles per hour to 8.0 miles per hour over the course of the season.
For reference, on April 2, the windiest day of the year, the daily average wind speed is 10.9 miles per hour, while on September 5, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.
Average Wind Speed in the Summer in Austin
The hourly average wind direction in Austin throughout the summer is predominantly from the south, with a peak proportion of 78% on July 15.
Wind Direction in the Summer in Austin
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).
The growing season in Austin typically lasts for 9.7 months (294 days), from around February 15 to around December 7, rarely starting after March 12, or ending before November 11.
The summer in Austin is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in the Summer in Austin
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
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 Austin are very rapidly increasing during the summer, increasing by 2,840°F, from 2,156°F to 4,997°F, over the course of the season.
Growing Degree Days in the Summer in Austin
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 Austin is gradually decreasing during the summer, falling by 1.0 kWh, from 6.8 kWh to 5.8 kWh, over the course of the season.
The highest average daily incident shortwave solar energy during the summer is 7.0 kWh on June 15.
Average Daily Incident Shortwave Solar Energy in the Summer in Austin
For the purposes of this report, the geographical coordinates of Austin are 30.267 deg latitude, -97.743 deg longitude, and 489 ft elevation.
The topography within 2 miles of Austin contains only modest variations in elevation, with a maximum elevation change of 190 feet and an average elevation above sea level of 510 feet. Within 10 miles contains only modest variations in elevation (712 feet). Within 50 miles contains significant variations in elevation (1,657 feet).
The area within 2 miles of Austin is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (51%) and trees (18%), and within 50 miles by cropland (30%) and shrubs (26%).
This report illustrates the typical weather in Austin, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Austin.
For each station, the records are corrected for the elevation difference between that station and Austin 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 Austin is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Austin and a given station.
The stations contributing to this reconstruction are:
To get a sense of how much these sources agree with each other, you can view a comparison of Austin and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data.
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , 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 airports 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.
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