July in Lake Havasu City is the hottest month of the year. In July, the weather in Lake Havasu City is typically hot. Average daily high temperature in July is about 39 degrees above zero. On average, Lake Havasu City has 27 sunny, 3 partly cloudy, and 1 rainy day in July. The rains are usually light. July as well as June and August is considered the most uncomfortable time to visit Lake Havasu City.