July in Ishim is the warmest month of the year. In July, the weather in Ishim is typically warm. Average daily high temperature in July is about 22 degrees above zero. On average, Ishim has 14 partly cloudy, 8 rainy, 8 sunny, and 1 cloudy day in July. The rains are usually light. July as well as June is considered the most comfortable time to visit Ishim.