August Weather in San Antonio

Last updated: March 2, 2024

The weather in San Antonio, United States, during August is characterized by an average temperature of 28°C (82°F). Highs can soar to 34°C (94°F), while lows may dip to 23°C (73°F). Typically, the humidity level in San Antonio throughout August hovers around 81%.

23°C (73°F)

Minimum temperature

28°C (82°F)

Average temperature

34°C (94°F)

Maximum temperature

81%

Humidity

Precipitation and Sunshine hours

In August, San Antonio averages 247 mm (9.7 inches) of rainfall, typically over the course of 28 rainy days. The month enjoys an average of 13 hours 5 minutes of daylight, with the sun shining for approximately 10 hours 10 minutes each day. Additionally, there is a 15% probability of sunny days during this period.

247 mm (9.7 inches)

Precipitation

28 rainy days

Rainy days

10 hours 10 minutes

Sunshine hours

15%

Chance of sun

UV Index

In August, the UV Index in San Antonio reaches a maximum of 11, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 13:00 and 15:00, during which unprotected skin may burn in as little as 10 minutes.

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
  07:00 08:00 09:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00
UVI 1 1 2 4 7 10 11 11 9 7 4 2 1
Exposure Low Moderate High VeryHigh Extreme VeryHigh High Moderate Low
Time to burn 45 min 30 min 25 min 15 min 10 min 15 min 25 min 30 min 45 min

Compare San Antonio's Climate with Cities Worldwide