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August Weather in San Antonio, Mexico

Last updated: August 27, 2025

In August, the average temperature in San Antonio, Mexico reaches a warm 31°C (88°F), with minimums dipping to 25°C (77°F) and peaking at a sweltering 39°C (102°F). Expect 73 mm (2.9 in) of precipitation over 9 days, contributing to an average humidity of 81%. Prepare for a tropical experience!

August Temperature in San Antonio

In August in San Antonio, the average temperature is 31°C (88°F). Maximums can reach 39°C (102°F), while minimums can drop to as low as 25°C (77°F). Be prepared for hot weather and stay hydrated while enjoying your travels!

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 31°C (88°F), with highs reaching up to 39°C (102°F) and lows dropping to around 25°C (77°F).
JanFebMarAprMayJunJulAugSepOctNovDec646568737884878886837466
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 precipitation amount is 73 mm (2.9 in), occurring over the course of 9 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 73 mm (2.9 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec13950018367377202816
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 81%. With average temperature 31°C (88°F), this humidity feels like a warm, heavy blanket enveloping you, making outdoor activities feel sluggish and requiring frequent breaks to stay hydrated and cool.

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 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%67%60%51%47%50%70%82%82%78%78%81%
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 is 12, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, underscoring the importance of sun protection. 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 12, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec68101212121212121075
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 Weather18°C (64°F)13 mm (0.5 inches)74%high
February Weather18°C (65°F)9 mm (0.4 inches)67%very high
March Weather20°C (68°F)5 mm (0.2 inches)60%very high
April Weather23°C (73°F)0 mm (0.0 inches)51%extreme
May Weather25°C (78°F)0 mm (0.0 inches)47%extreme
June Weather29°C (84°F)18 mm (0.7 inches)50%extreme
July Weather31°C (88°F)36 mm (1.4 inches)70%extreme
August Weather31°C (88°F)73 mm (2.9 inches)81%extreme
September Weather30°C (86°F)77 mm (3.0 inches)82%extreme
October Weather28°C (83°F)20 mm (0.8 inches)78%very high
November Weather24°C (75°F)28 mm (1.1 inches)78%high
December Weather19°C (66°F)16 mm (0.6 inches)80%moderate

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