May weather forecast in Fort Smith

May in Fort Smith is the rainiest and the cloudiest month of the year. In May, the weather in Fort Smith is typically warm. Average daily high temperature in May is about 26 degrees above zero. On average, Fort Smith has 14 rainy, 9 sunny, 7 partly cloudy, and 1 cloudy day in May. The rains are usually heavy. May as well as January, February, March, and June is considered the most uncomfortable time to visit Fort Smith.