July in Hessisch Oldendorf is the warmest month of the year. In July, the weather in Hessisch Oldendorf is typically warm. Average daily high temperature in July is about 22 degrees above zero. On average, Hessisch Oldendorf has 17 rainy, 7 sunny, 6 partly cloudy, and 1 cloudy day in July. The rains are usually moderate.