June in Carbondale is the windiest and the sunniest month of the year. In June, the weather in Carbondale is typically warm. Average daily high temperature in June is about 19 degrees above zero. On average, Carbondale has 22 sunny, 7 partly cloudy, and 1 rainy day in June. The rains are usually light. June as well as August is considered the most comfortable time to visit Carbondale.