San Antonio, TX Climate

Summary Graph

The summary climate graph for San Antonio, TX shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for San Antonio, TX.


The warmest month in San Antonio International, San Antonio, Texas is August with an average high temperature of 95.4°F. The hottest day on record was September 6 2000 when the temperature hit 111.0°F. During January the overnight temperature drops to an average of 40.5°F with the lowest temperature of 0.0°F being recorded on January 31 1949.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

6 Sep 2000111°F
29 Aug 2011109.9°F
20 Aug 1986107.4°F
15 Jun 1998107.1°F
20 Jul 1989106.3°F

The warmest months on average were:

August 2011102.4°F
July 2009101.5°F
August 2009101.3°F
August 2006100.3°F
July 1980100.1°F

The coldest days on record are:

31 Jan 19490°F
24 Dec 19896.1°F
2 Feb 19517°F
31 Dec 19839.1°F
12 Jan 196210.9°F

The coldest months on average were:

December 198929.6°F
January 198532.1°F
December 198332.1°F
January 197832.6°F
January 197733.1°F


The wettest month by average rainfall in San Antonio, TX is May with an average of 2.6 inches of rain falling on 10 to 11 days.Although in March it typically rains on more days with 1.4 inches falling in 11 to 12 days. The driest month by average rainfall in San Antonio, TX is December with an average of 1.1 inches of rain falling on 10 to 11 days. Although in July it typically rains on less days with 1.7 inches falling in 5 to 6 days

Wettest Days

The wettest days on record are:

4 March 19923.6 inches
16 March 19942.6 inches
12 March 20072.1 inches
14 March 19851.8 inches
28 March 19991.8 inches

Wettest Months

The wettest months on record are:

January 197319.6 inches
January 199518.6 inches
October 199818 inches
April 197316.8 inches
June 197316.1 inches

Driest Months

The driest months on record are:

September 19460 inches
October 19460 inches
November 19460 inches
December 19460 inches
January 19470 inches