May Weather in San Antonio

Last updated: March 2, 2024

The weather in San Antonio, United States, during May is characterized by an average temperature of 25°C (78°F). Highs can soar to 35°C (95°F), while lows may dip to 15°C (59°F). Typically, the humidity level in San Antonio throughout May hovers around 68%.

15°C (59°F)

Minimum temperature

25°C (78°F)

Average temperature

35°C (95°F)

Maximum temperature

68%

Humidity

Precipitation and Sunshine hours

In May, San Antonio averages 123 mm (4.8 inches) of rainfall, typically over the course of 11 rainy days. The month enjoys an average of 13 hours 32 minutes of daylight, with the sun shining for approximately 10 hours 44 minutes each day. Additionally, there is a 53% probability of sunny days during this period.

123 mm (4.8 inches)

Precipitation

11 rainy days

Rainy days

10 hours 44 minutes

Sunshine hours

53%

Chance of sun

UV Index

In May, 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 3 5 8 10 11 11 9 7 4 2 1
Exposure Low Moderate VeryHigh Extreme VeryHigh High Moderate Low
Time to burn 45 min 30 min 15 min 10 min 15 min 25 min 30 min 45 min

Compare San Antonio's Climate with Cities Worldwide