August in Laredo is the hottest month of the year. In August, the weather in Laredo is typically hot. Average daily high temperature in August is about 38 degrees above zero. On average, Laredo has 19 sunny, 5 rainy, 5 partly cloudy, and 2 cloudy days in August. The rains are usually moderate. August as well as May, June, July, and September is considered the most uncomfortable time to visit Laredo.