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August Weather in San Antonio, Mexico

Last updated: August 27, 2025

In August, the average temperature in San Antonio, Mexico is a pleasant 19°C (66°F). Expect a range with minimums dipping to 11°C (53°F) and maximums rising to 29°C (84°F). However, be prepared for potential rainfall, with an average precipitation amount of 383 mm (15.1 in) spread over 29 days, and enjoy the lush atmosphere with an average humidity of 83%.

August Temperature in San Antonio

In August in San Antonio, the average temperature is 19°C (66°F). Maximums can reach 29°C (84°F) and minimums can be as low as 11°C (53°F). This mild climate makes San Antonio a perfect destination for outdoor activities and exploration during this time of year.

August Weather in San Antonio: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in San Antonio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Antonio, August typically has an average temperature of 19°C (66°F), with highs reaching up to 29°C (84°F) and lows dropping to around 11°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec596266687068666666666360
Data source: Temperature data for San Antonio generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in San Antonio

In San Antonio in August, the total precipitation amount is 383 mm (15.1 in) spread over a duration of 29 days.

August Precipitation Trends in San Antonio

The chart displays monthly precipitation patterns in San Antonio, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In San Antonio, August typically receives around 383 mm (15.1 inches) of precipitation spread over approximately 29 days.
JanFebMarAprMayJunJulAugSepOctNovDec132173462324203833471453815
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in San Antonio

In San Antonio in August, humidity is 83%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making travel feel more sluggish and muggy, yet there's a refreshing coolness in the air that invites you to explore.

August Average Humidity in San Antonio

This chart illustrates the average monthly humidity levels in San Antonio, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in San Antonio is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec70%65%59%60%67%80%81%83%83%80%77%76%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in San Antonio

In San Antonio in August, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in San Antonio.

Maximum UV Index Levels in San Antonio for August

The chart shows the monthly maximum UV Index (UVI) for San Antonio in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in San Antonio typically reaches 13, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec9111415141413131412108
Data source: San Antonio August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in San Antonio Compares to Other Months

Weather in San Antonio varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in San Antonio, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in San Antonio, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (60°F)13 mm (0.5 inches)70%very high
February Weather16°C (62°F)21 mm (0.8 inches)65%extreme
March Weather19°C (66°F)7 mm (0.3 inches)59%extreme
April Weather20°C (68°F)3 mm (0.1 inches)60%extreme
May Weather21°C (70°F)46 mm (1.8 inches)67%extreme
June Weather20°C (69°F)231 mm (9.1 inches)80%extreme
July Weather19°C (66°F)420 mm (16.5 inches)81%extreme
August Weather19°C (66°F)383 mm (15.1 inches)83%extreme
September Weather19°C (66°F)347 mm (13.7 inches)83%extreme
October Weather19°C (66°F)145 mm (5.7 inches)80%extreme
November Weather17°C (63°F)38 mm (1.5 inches)77%very high
December Weather15°C (60°F)15 mm (0.6 inches)76%very high

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