San Antonio, TX Climate in September

Temperature for September

In San Antonio, TX during September the average high temperature is 90.4°F. The hottest day on record was September 25, 2005 when the temperature hit 107.6°F.

San Antonio, TX daily average and extreme temperature range for September

Low Temperature

During September the overnight temperature drops to an average of 70.2°F, with the lowest temperature of 42.4°F being recorded on September 27, 1942. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in San Antonio, TX is 1.57 inches with rain usually falling on between 8 and 9 days. 1938 was the driest September with only 0.00 inches of rain falling, and 2010 was the wettest September with 10.18 inches of rain. The wettest single day in September was 8 September 2010 when 5.36 inches of rain fell.

There are thunderstorms on between 3 and 4 days in September.