San Antonio in February is characterized by gradual warming, an increase in the average hours of daylight, and a relatively low UV index. Limited downpours and an increase in cloud cover are also observed during this month. It's a month with an average maximum wind slightly higher, hitting 9.2mph. 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. San Antonio in February usually receives moderate rainfall, averaging around 34 mm for the month. Rain is expected on roughly 6 days. The area experiences a moderate amount of sunshine, with approximately 170 hours of sunlight expected. This makes it neither too gloomy nor overly bright. zFE6B.