Last updated: June 24, 2025
In August, the average temperature in San Antonio, United States hovers around a warm 28°C (82°F). You can expect minimum temperatures to drop to 22°C (73°F) and highs soaring up to 35°C (96°F). With precipitation totaling 247 mm (9.7 in) over approximately 28 days, it’s a month of wet weather, accompanied by an average humidity of 81%. Stay prepared for both the heat and the rain!
In August in San Antonio, the average temperature is 28°C (82°F). The maximum can reach 35°C (96°F), while the minimum can drop to 22°C (73°F). It's a great time to visit for those who enjoy warm weather and outdoor activities.
In San Antonio in August, the precipitation amount is 247 mm (9.7 in) over the course of 28 days.
In San Antonio in August, humidity is 81%. With an average temperature of 28°C (82°F), this humidity feels like a warm blanket wrapped around you, making traveling somewhat uncomfortable as the air thickens, leaving you longing for a refreshing breeze.
In San Antonio in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in San Antonio.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 16°C (60°F) | 43 mm (1.7 inches) | 83% | high |
| February Weather | 19°C (66°F) | 69 mm (2.7 inches) | 80% | very high |
| March Weather | 20°C (68°F) | 20 mm (0.8 inches) | 75% | very high |
| April Weather | 23°C (73°F) | 77 mm (3.0 inches) | 70% | extreme |
| May Weather | 25°C (78°F) | 123 mm (4.8 inches) | 68% | extreme |
| June Weather | 27°C (81°F) | 223 mm (8.8 inches) | 75% | extreme |
| July Weather | 27°C (81°F) | 276 mm (10.8 inches) | 79% | extreme |
| August Weather | 28°C (82°F) | 247 mm (9.7 inches) | 81% | extreme |
| September Weather | 27°C (81°F) | 189 mm (7.4 inches) | 83% | extreme |
| October Weather | 25°C (77°F) | 82 mm (3.2 inches) | 81% | very high |
| November Weather | 20°C (68°F) | 49 mm (1.9 inches) | 82% | high |
| December Weather | 17°C (64°F) | 70 mm (2.8 inches) | 84% | moderate |