August in Saint Francois is the cloudiest month of the year. In August, the weather in Saint Francois is typically hot. Average daily high temperature in August is about 28 degrees above zero. On average, Saint Francois has 25 rainy, 5 partly cloudy, and 1 sunny day in August. The rains are usually heavy. August as well as January, May, June, and July is considered the most uncomfortable time to visit Saint Francois.