The highest day temperature in May 2025 was 68°F. The lowest night temperature was 46°F. The average values for day and night temperatures during May were 61.4°F и 53.8°F respectivly.

The average sea surface temperature in May 2025 for San Antonio was 54.8°F. The maximum and minimum values were 50.0°F and 56.8°F respectively.

Most of the days in May are sunny but you can also expect cloudy and gloomy days.

Precipitation total in May for San Antonio is 0.3 in. It makes may one of the most rainy months of the year.

The average wind speed in May is 7.2 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for San Antonio in May is 7.7 hours.