Temperature for May
In San Antonio, TX during May the average high temperature is 86.9°F. The hottest day on record was May 31, 2004 when the temperature hit 104.0°F.
Precipitation for May
In May the average monthly rainfall in San Antonio, TX is 2.56 inches with rain usually falling on between 10 and 11 days. 1948 was the driest May with only 0.00 inches of rain falling, and 1987 was the wettest May with 11.31 inches of rain. The wettest single day in May was 15 May 2010 when 3.86 inches of rain fell.
There are thunderstorms on between 5 and 6 days in May.