July in Niceville is the rainiest, the cloudiest, and the hottest month of the year. In July, the weather in Niceville is typically hot. Average daily high temperature in July is about 31 degrees above zero. On average, Niceville has 22 rainy, 4 sunny, 4 partly cloudy, and 1 cloudy day in July. The rains are usually heavy. July as well as June and August is considered the most uncomfortable time to visit Niceville.