August in Tyler is the hottest month of the year. In August, the weather in Tyler is typically hot. Average daily high temperature in August is about 35 degrees above zero. On average, Tyler has 15 sunny, 8 partly cloudy, 7 rainy, and 1 cloudy day in August. The rains are usually moderate. August as well as May, June, July, and December is considered the most uncomfortable time to visit Tyler.