San Antonio, TX Climate in September

Temperature for September

In San Antonio, TX during September the average high temperature is 89.7°F. The hottest day on record was September 25, 2005 when the temperature hit 104.0°F.

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

Low Temperature

During September the overnight temperature drops to an average of 69.2°F, with the lowest temperature of 43.0°F being recorded on September 22, 1983. In September it has never frozen overnight.

Precipitation for September

In September the average monthly rainfall in San Antonio, TX is 1.87 inches with rain usually falling on between 8 and 9 days. 1940 was the driest September with only 0.00 inches of rain falling, and 1973 was the wettest September with 15.45 inches of rain. The wettest single day in September was 8 September 2010 when 6.73 inches of rain fell.

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