August in San Angelo is the rainiest and the cloudiest month of the year. In August, the weather in San Angelo is typically hot. Average daily high temperature in August is about 33 degrees above zero. On average, San Angelo has 15 sunny, 12 partly cloudy, and 4 rainy days in August. The rains are usually light. August as well as January, June, July, and December is considered the most uncomfortable time to visit San Angelo.