July in Oskarshamn is the sunniest and the warmest month of the year. In July, the weather in Oskarshamn is typically warm. Average daily high temperature in July is about 20 degrees above zero. On average, Oskarshamn has 13 partly cloudy, 11 sunny, and 7 rainy days in July. The rains are usually light. July as well as August is considered the most comfortable time to visit Oskarshamn.