Last updated: June 24, 2025
In San Antonio, United States, the average temperature in May hovers around 25°C (78°F), creating a delightful climate for outdoor activities. Expect temperatures to vary between a minimum of 12°C (53°F) and a maximum of 36°C (97°F). With precipitation totaling 123 mm (4.8 in) over 11 days, it's wise to prepare for occasional rain. The average humidity stands at a comfortable 68%, ensuring a pleasant atmosphere throughout the month.
In May in San Antonio, the average temperature is 25°C (78°F). The maximum can reach 36°C (97°F), while the minimum can drop as low as 12°C (53°F). Pack accordingly to enjoy your travels comfortably!
In San Antonio in May, the precipitation amount is 123 mm (4.8 in) occurring over the course of 11 days.
In San Antonio in May, humidity is 68%. With an average temperature of 25°C (78°F), this humidity feels like a warm blanket enveloping you, making outdoor activities feel a bit more intense and sticky, but still manageable for traveling if you stay hydrated and take breaks in the shade.
In San Antonio in May, 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 May’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 |