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May Weather in San Antonio, Puerto Rico

Last updated: August 31, 2025

In San Antonio, Puerto Rico, the average temperature in May reaches a pleasant 26°C (79°F). Expect a minimum of 23°C (74°F) and a peak of 31°C (88°F), making it a comfortable time to explore. However, be prepared for some rain, as 97 mm (3.8 in) of precipitation is likely over 19 days. The average humidity sits at a humid 75%, ensuring a refreshing atmosphere.

May Temperature in San Antonio

In May in San Antonio, the average temperature is 26°C (79°F). Maximums can reach 31°C (88°F), while minimums can drop to as low as 23°C (74°F). This pleasant climate makes San Antonio an ideal destination for travelers seeking warm weather and outdoor activities.

May Weather in San Antonio: Daily Temperature Highs, Lows, and Averages

The chart illustrates May 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, May typically has an average temperature of 26°C (79°F), with highs reaching up to 31°C (88°F) and lows dropping to around 23°C (74°F).
JanFebMarAprMayJunJulAugSepOctNovDec767676777980818181807978
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.

May Precipitation in San Antonio

In San Antonio in May, the precipitation amount is 97 mm (3.8 in) spread over the course of 19 days.

May Precipitation Trends in San Antonio

The chart displays monthly precipitation patterns in San Antonio, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In San Antonio, May typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec34397266978591971881279943
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in San Antonio

In San Antonio in May, humidity is 75%. With an average temperature of 26°C (79°F), this humidity feels like a warm blanket wrapped around you, making traveling a sticky experience where every step requires extra effort and frequent breaks to cool off.

May Average Humidity in San Antonio

This chart illustrates the average monthly humidity levels in San Antonio, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in San Antonio is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%75%74%75%75%77%80%80%79%78%78%76%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in San Antonio

In San Antonio in May, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in San Antonio, you can check here.

Maximum UV Index Levels in San Antonio for May

The chart shows the monthly maximum UV Index (UVI) for San Antonio in May, 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 May, the maximum UV index in San Antonio typically reaches 14, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec911131314131313131298
Data source: San Antonio May 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 May 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 May’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 May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)34 mm (1.3 inches)76%very high
February Weather25°C (76°F)39 mm (1.5 inches)75%extreme
March Weather25°C (76°F)72 mm (2.8 inches)74%extreme
April Weather25°C (78°F)66 mm (2.6 inches)75%extreme
May Weather26°C (79°F)97 mm (3.8 inches)75%extreme
June Weather27°C (81°F)85 mm (3.3 inches)77%extreme
July Weather27°C (81°F)91 mm (3.6 inches)80%extreme
August Weather27°C (82°F)97 mm (3.8 inches)80%extreme
September Weather27°C (81°F)188 mm (7.4 inches)79%extreme
October Weather27°C (81°F)127 mm (5.0 inches)78%extreme
November Weather26°C (79°F)99 mm (3.9 inches)78%very high
December Weather25°C (78°F)43 mm (1.7 inches)76%very high

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