Temperature Graph. °F. 100° 86° 72° 58° 44° Feb. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28. Avg. Hi. 68°. 45°. 1.74. March. 74°. 52°. 2.31. Weather.com brings you the most accurate monthly weather forecast for San Antonio, TX with average/record and high/low temperatures, precipitation and more. 40 °F min. or less (4 °C) The temperature rises nearly every day during February to over 50 degrees Fahrenheit (10 degrees Celsius) in San Antonio. The city averages 4 days this month when the thermometer reaches into the 80s °F (over 27 °C). Temperatures above 90 °F (32 °C) happen only rarely during February. San Antonio, Texas weather in February Historical temperature average in February In San Antonio, Texas, United States Other months F/inches/miles 69 ° F highs 45 ° F lows 1am 3am 5am 7am 9am 11am 1pm 3pm 5pm 7pm 9pm 12am General weather summary Mildly cool with a gentle breeze Feels like 16% Chance of rain 0.081 in Amount 14.8 mph Wind speed 72% uXVv8H.