July in Caltanissetta is the sunniest and the hottest month of the year. In July, the weather in Caltanissetta is typically hot. Average daily high temperature in July is about 30 degrees above zero. On average, Caltanissetta has 30 sunny and 1 rainy day in July. The rains are usually light. July as well as May, June, August, and September is considered the most comfortable time to visit Caltanissetta.