July in Vanimo is the coldest month of the year. In July, the weather in Vanimo is typically warm. Average daily high temperature in July is about 27 degrees above zero. On average, Vanimo has 26 rainy, 4 sunny, and 1 cloudy day in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Vanimo.