July in Napier is the windiest and the coldest month of the year. In July, the weather in Napier is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Napier has 13 sunny, 12 partly cloudy, 4 rainy, and 2 cloudy days in July. The rains are usually light. July as well as August is considered the most uncomfortable time to visit Napier.