San Antonio, Texas, Average Temperature Rankings, April 2009 1991-2020 Degrees Fahrenheit 1 70.1 70.2 -0.1 94 36 1931 2006 2007 2008 top-third 1934 2 67.8 66.8 1.0 103 27 1915 2006 2007 2008 top-third 1897,1991,2021 3 66.3 63.6 2.7 125 5 1958 2017 2008 2006 top-tenth 2011 4 63.4 60.9 2.5 123 7 1978 2017 2008 2006 top-tenth 5 61.8 59.6 2.2 123 6 1915,1978 2017 2008 2006 top-tenth 6 62.2 59.9 2.3 125 4 1973 2017 2008 2006 top-tenth 7 63.5 61.6 1.9 125 4 1977 2017 2008 2006 top-tenth 8 65.6 64.0 1.6 123 6 1977 2017 2008 2006 top-tenth 1999 9 67.7 66.5 1.2 122 7 1977 2017 2008 2006 top-tenth 1999 10 69.4 68.4 1.0 120 9 1977 2017 2008 2006 top-tenth 11 71.0 69.7 1.3 122 7 1977 2017 2008 2006 top-tenth 12 71.8 70.4 1.4 123 6 1977 2012 2008 2006 top-tenth 2000 18 68.4 66.9 1.5 124 4 1913,1959,1969 2012,2017 2008 2000 top-tenth 2023 24 71.1 70.3 0.8 120 8 1978 2000 2008 2007 top-tenth 36 70.8 70.3 0.5 116 11 1960,1977,1979 2013 2007 2008 top-tenth 2007,2022 48 71.1 70.3 0.8 124 2 1978 2023 2008 2009 top-tenth 2012,2019,2020 60 70.9 70.3 0.6 119 6 1977,1979 2013,2020 2008 2009 top-tenth