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.
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.
The warmest days on record are:
| 6 Sep 2000 | 111°F |
| 29 Aug 2011 | 109.9°F |
| 20 Aug 1986 | 107.4°F |
| 15 Jun 1998 | 107.1°F |
| 20 Jul 1989 | 106.3°F |
The warmest months on average were:
| August 2011 | 102.4°F |
| July 2009 | 101.5°F |
| August 2009 | 101.3°F |
| August 2006 | 100.3°F |
| July 1980 | 100.1°F |
The coldest days on record are:
| 31 Jan 1949 | 0°F |
| 24 Dec 1989 | 6.1°F |
| 2 Feb 1951 | 7°F |
| 31 Dec 1983 | 9.1°F |
| 12 Jan 1962 | 10.9°F |
The coldest months on average were:
| December 1989 | 29.6°F |
| January 1985 | 32.1°F |
| December 1983 | 32.1°F |
| January 1978 | 32.6°F |
| January 1977 | 33.1°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
The wettest days on record are:
| 4 March 1992 | 3.6 inches |
| 16 March 1994 | 2.6 inches |
| 12 March 2007 | 2.1 inches |
| 14 March 1985 | 1.8 inches |
| 28 March 1999 | 1.8 inches |
The wettest months on record are:
| January 1973 | 19.6 inches |
| January 1995 | 18.6 inches |
| October 1998 | 18 inches |
| April 1973 | 16.8 inches |
| June 1973 | 16.1 inches |
The driest months on record are:
| September 1946 | 0 inches |
| October 1946 | 0 inches |
| November 1946 | 0 inches |
| December 1946 | 0 inches |
| January 1947 | 0 inches |