May in Fort Worth is the rainiest month of the year. In May, the weather in Fort Worth is typically hot. Average daily high temperature in May is about 28 degrees above zero. On average, Fort Worth has 11 rainy, 10 sunny, 7 partly cloudy, and 3 cloudy days in May. The rains are usually heavy. May as well as January, June, July, and August is considered the most uncomfortable time to visit Fort Worth.