August in Santa Susana is the warmest month of the year. In August, the weather in Santa Susana is typically warm. Average daily high temperature in August is about 27 degrees above zero. On average, Santa Susana has 12 rainy, 11 sunny, and 8 partly cloudy days in August. The rains are usually heavy. August as well as January, February, March, and April is considered the most uncomfortable time to visit Santa Susana.