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May Weather at San Antonio International Airport Texas, United States

Daily high temperatures increase by 5°F, from 84°F to 89°F, rarely falling below 77°F or exceeding 96°F.

Daily low temperatures increase by 7°F, from 65°F to 71°F, rarely falling below 54°F or exceeding 76°F.

For reference, on August 4, the hottest day of the year, temperatures at San Antonio International Airport typically range from 76°F to 96°F, while on January 6, the coldest day of the year, they range from 43°F to 62°F.

Average High and Low Temperature in May at San Antonio International Airport

Average High and Low Temperature in May at San Antonio International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313140°F40°F45°F45°F50°F50°F55°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°FAprJunMay 184°FMay 184°F65°F65°FMay 3189°FMay 3189°F71°F71°FMay 1186°FMay 1186°F67°F67°FMay 2188°FMay 2188°F69°F69°F
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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 May at San Antonio International Airport

Average Hourly Temperature in May at San Antonio International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJuncoolcomfortablecomfortablewarmhotcool
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 average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Ben Gardane, Tunisia (6,130 miles away); Riāsi, Kashmir, India (8,097 miles); and Rong’an, China (7,864 miles) are the far-away foreign places with temperatures most similar to San Antonio International Airport (view comparison).

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The month of May at San Antonio International Airport experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 38% to 28%.

The clearest day of the month is May 31, 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 46%, while on June 10, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 73%.

Cloud Cover Categories in May at San Antonio International Airport

Cloud Cover Categories in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 162%May 162%May 3172%May 3172%May 1164%May 1164%May 2168%May 2168%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At San Antonio International Airport, the chance of a wet day over the course of May is increasing, starting the month at 27% and ending it at 31%.

For reference, the year's highest daily chance of a wet day is 32% on May 29, and its lowest chance is 13% on December 15.

Probability of Precipitation in May at San Antonio International Airport

Probability of Precipitation in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%AprJunMay 2632%May 2632%May 127%May 127%May 1130%May 1130%rain
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

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 May at San Antonio International Airport is increasing, starting the month at 2.9 inches, when it rarely exceeds 5.4 inches or falls below 0.6 inches, and ending the month at 3.6 inches, when it rarely exceeds 8.0 inches or falls below 0.6 inches.

The highest average 31-day accumulation is 3.7 inches on May 24.

Average Monthly Rainfall in May at San Antonio International Airport

Average Monthly Rainfall in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 in8 in8 inAprJunMay 243.7 inMay 243.7 inMay 12.9 inMay 12.9 inMay 113.4 inMay 113.4 in
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.

Over the course of May at San Antonio International Airport, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 35 minutes, implying an average daily increase of 1 minute, 10 seconds, and weekly increase of 8 minutes, 10 seconds.

The shortest day of the month is May 1, with 13 hours, 20 minutes of daylight and the longest day is May 31, with 13 hours, 55 minutes of daylight.

Hours of Daylight and Twilight in May at San Antonio International Airport

Hours of Daylight and Twilight in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrAprJunnightnightdaydayMay 113 hr, 20 minMay 113 hr, 20 minMay 3113 hr, 55 minMay 3113 hr, 55 minMay 1613 hr, 40 minMay 1613 hr, 40 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The latest sunrise of the month at San Antonio International Airport is 6:51 AM on May 1 and the earliest sunrise is 17 minutes earlier at 6:34 AM on May 31.

The earliest sunset is 8:11 PM on May 1 and the latest sunset is 18 minutes later at 8:29 PM on May 31.

Daylight saving time is observed at San Antonio International Airport during 2024, but it neither starts nor ends during May, so the entire month is in daylight saving time.

For reference, on June 20, the longest day of the year, the Sun rises at 6:34 AM and sets 14 hours, 3 minutes later, at 8:36 PM, while on December 21, the shortest day of the year, it rises at 7:24 AM and sets 10 hours, 15 minutes later, at 5:39 PM.

Sunrise & Sunset with Twilight in May at San Antonio International Airport

The solar day over the course of May. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in May at San Antonio International Airport

Solar Elevation and Azimuth in May at San Antonio International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAprJun0010102020203030404050505060607070800001010202030303040405050606060707080
northeastsouthwest
Solar elevation and azimuth over the course of May 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for May 2024. 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 May at San Antonio International Airport

Moon Rise, Set & Phases in May at San Antonio International AirportMay112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 81:22 PMApr 81:22 PMApr 236:50 PMApr 236:50 PMMay 710:23 PMMay 710:23 PMMay 238:54 AMMay 238:54 AMJun 67:38 AMJun 67:38 AMJun 218:09 PMJun 218:09 PM7:08 AM7:08 AM8:11 PM8:11 PM8:06 PM8:06 PM7:11 AM7:11 AM6:13 AM6:13 AM8:08 PM8:08 PM7:55 PM7:55 PM6:23 AM6:23 AM6:20 AM6:20 AM9:13 PM9:13 PM8:48 PM8:48 PM6:51 AM6:51 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
May 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
50%2:42 AMESE1:22 PMWSW-8:02 AMS232,006 mi
2
38%3:22 AMESE2:29 PMWSW-8:55 AMS229,694 mi
3
26%3:57 AMESE3:36 PMW-9:46 AMS227,734 mi
4
16%4:31 AME4:43 PMW-10:35 AMS226,331 mi
5
8%5:03 AME5:49 PMW-11:24 AMS225,684 mi
6
3%5:37 AME6:58 PMWNW-12:14 PMS225,945 mi
7
0%6:13 AMENE8:08 PMWNW-1:07 PMS227,179 mi
8
1%6:54 AMENE9:18 PMWNW-2:03 PMS229,341 mi
9
4%7:40 AMENE10:27 PMWNW-3:01 PMS232,270 mi
10
10%8:33 AMENE11:30 PMWNW-4:01 PMS235,707 mi
11
17%9:31 AMENE--5:00 PMS239,343 mi
12
26%-12:26 AMWNW10:32 AMENE5:55 PMS242,862 mi
13
36%-1:14 AMWNW11:33 AMENE6:46 PMS245,988 mi
14
46%-1:54 AMWNW12:32 PMENE7:33 PMS248,507 mi
15
50%-2:28 AMWNW1:29 PMENE8:16 PMS250,280 mi
16
65%-2:58 AMWNW2:24 PMENE8:56 PMS251,242 mi
17
74%-3:25 AMW3:17 PME9:35 PMS251,394 mi
18
82%-3:50 AMW4:09 PME10:13 PMS250,799 mi
19
89%-4:16 AMW5:02 PME10:53 PMS249,562 mi
20
94%-4:43 AMWSW5:57 PMESE11:34 PMS247,825 mi
21
97%-5:12 AMWSW6:54 PMESE--
22
98%-5:44 AMWSW7:55 PMESE12:19 AMS245,740 mi
23
100%-6:23 AMWSW8:57 PMESE1:08 AMS243,463 mi
24
99%-7:08 AMWSW9:59 PMESE2:02 AMS241,136 mi
25
97%-8:01 AMWSW10:59 PMESE3:00 AMS238,872 mi
26
91%-9:02 AMWSW11:53 PMESE4:00 AMS236,753 mi
27
84%-10:07 AMWSW-5:00 AMS234,824 mi
28
75%12:41 AMESE11:14 AMWSW-5:58 AMS233,105 mi
29
64%1:22 AMESE12:21 PMWSW-6:52 AMS231,611 mi
30
50%1:58 AMESE1:27 PMWSW-7:42 AMS230,366 mi
31
41%2:32 AME2:32 PMW-8:31 AMS229,420 mi

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 at San Antonio International Airport is very rapidly increasing during May, rising from 42% to 73% over the course of the month.

For reference, on July 1, the muggiest day of the year, there are muggy conditions 87% of the time, while on January 16, the least muggy day of the year, there are muggy conditions 2% of the time.

Humidity Comfort Levels in May at San Antonio International Airport

Humidity Comfort Levels in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 142%May 142%May 3173%May 3173%May 1152%May 1152%May 2164%May 2164%oppressiveoppressivemuggymuggyhumidhumiddrydrycomfortablecomfortablemiserablemiserable
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

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 at San Antonio International Airport is gradually decreasing during May, decreasing from 10.3 miles per hour to 9.7 miles per hour over the course of the month.

For reference, on April 1, the windiest day of the year, the daily average wind speed is 10.5 miles per hour, while on September 4, the calmest day of the year, the daily average wind speed is 7.9 miles per hour.

Average Wind Speed in May at San Antonio International Airport

Average Wind Speed in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphAprJunMay 110.3 mphMay 110.3 mphMay 319.7 mphMay 319.7 mphMay 219.9 mphMay 219.9 mph
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction at San Antonio International Airport throughout May is predominantly from the south, with a peak proportion of 65% on May 31.

Wind Direction in May at San Antonio International Airport

Wind Direction in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%AprJunsouthnortheastwest
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

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 at San Antonio International Airport typically lasts for 9.6 months (291 days), from around February 17 to around December 4, rarely starting before January 10 or after March 19, and rarely ending before November 13 or after December 27.

The month of May at San Antonio International Airport is reliably fully within the growing season.

Time Spent in Various Temperature Bands and the Growing Season in May at San Antonio International Airport

Time Spent in Various Temperature Bands and the Growing Season in May at San Antonio International Airportgrowing seasongrowing seasongrowing seasonMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun100%May 16100%May 16coldcoolcomfortablewarmhotsweltering
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 percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

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 at San Antonio International Airport are rapidly increasing during May, increasing by 772°F, from 1,426°F to 2,198°F, over the course of the month.

Growing Degree Days in May at San Antonio International Airport

Growing Degree Days in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031311,400°F1,400°F1,600°F1,600°F1,800°F1,800°F2,000°F2,000°F2,200°F2,200°F2,400°F2,400°FAprJunMay 11,426°FMay 11,426°FMay 312,198°FMay 312,198°FMay 111,664°FMay 111,664°FMay 211,922°FMay 211,922°F
The average growing degree days accumulated over the course of May, with 25th to 75th and 10th to 90th percentile bands.

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 at San Antonio International Airport is essentially constant during May, remaining within 0.2 kWh of 6.6 kWh throughout.

Average Daily Incident Shortwave Solar Energy in May at San Antonio International Airport

Average Daily Incident Shortwave Solar Energy in May at San Antonio International AirportMay11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhAprJunMay 16.4 kWhMay 16.4 kWhMay 316.9 kWhMay 316.9 kWhMay 116.5 kWhMay 116.5 kWhMay 216.6 kWhMay 216.6 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of San Antonio International Airport are 29.534 deg latitude, -98.470 deg longitude, and 781 ft elevation.

The topography within 2 miles of San Antonio International Airport contains only modest variations in elevation, with a maximum elevation change of 220 feet and an average elevation above sea level of 780 feet. Within 10 miles contains only modest variations in elevation (764 feet). Within 50 miles contains significant variations in elevation (1,860 feet).

The area within 2 miles of San Antonio International Airport is covered by artificial surfaces (90%), within 10 miles by artificial surfaces (74%) and shrubs (15%), and within 50 miles by shrubs (36%) and cropland (23%).

This report illustrates the typical weather at San Antonio International Airport, 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

San Antonio International Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Kelly Field Annex, Stinson Municipal Airport, Randolph Air Force Base, New Braunfels Municipal Airport, Pleasanton Municipal Airport, San Marcos Municipal Airport, Hondo Municipal Airport, and Vamc Heliport.

Other 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 © OpenStreetMap contributors.

Disclaimer

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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