August in Los Mochis is the rainiest and the cloudiest month of the year. In August, the weather in Los Mochis is typically hot. Average daily high temperature in August is about 36 degrees above zero. On average, Los Mochis has 17 rainy, 7 partly cloudy, 4 cloudy, and 3 sunny days in August. The rains are usually heavy. August as well as July and September is considered the most uncomfortable time to visit Los Mochis.