September in Fort Stockton is the rainiest month of the year. In September, the weather in Fort Stockton is typically hot. Average daily high temperature in September is about 29 degrees above zero. On average, Fort Stockton has 16 sunny, 7 rainy, and 7 partly cloudy days in September. The rains are usually light. September as well as June, July, and August is considered the most uncomfortable time to visit Fort Stockton.