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 Lackland Air Force Base Kelly Field Annex, San Antonio, Texas is August with an average high temperature of 95.8°F. The hottest day on record was August 28 2011 when the temperature hit 110.1°F. During January the overnight temperature drops to an average of 42.3°F with the lowest temperature of 3.9°F being recorded on January 31 1949.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

28 Aug 2011110.1°F
15 Jun 1998109.4°F
26 Jul 1954108°F
25 Sep 2005107.6°F
8 Jul 1939107.2°F

The warmest months on average were:

July 1998102.6°F
August 2011102.5°F
August 2006101.1°F
July 2009101.1°F
July 1980101°F

The coldest days on record are:

31 Jan 19493.9°F
2 Feb 19519°F
23 Dec 19899.1°F
12 Jan 196210°F
25 Dec 198313.1°F

The coldest months on average were:

January 194032.6°F
January 196233.6°F
January 196335.1°F
January 197735.7°F
December 198935.8°F


The wettest month by average rainfall in San Antonio, TX is May with an average of 2.0 inches of rain falling on 11 to 12 days.Although in March it typically rains on more days with 1.0 inches falling in 11 to 12 days. The driest month by average rainfall in San Antonio, TX is December with an average of 0.8 inches of rain falling on 10 to 11 days. Although in July it typically rains on less days with 0.9 inches falling in 5 to 6 days

Wettest Days

The wettest days on record are:

20 December 19914.9 inches
23 December 19863.7 inches
15 December 19921.5 inches
25 December 19751.1 inches
8 December 19971.1 inches

Wettest Months

The wettest months on record are:

August 197415.1 inches
October 199813.9 inches
December 199113.7 inches
June 198113.5 inches
June 198710.7 inches

Driest Months

The driest months on record are:

August 19370 inches
September 19370 inches
October 19370 inches
November 19370 inches
December 19370 inches