April in Royal Oak is the rainiest month of the year. In April, the weather in Royal Oak is typically warm. Average daily high temperature in April is about 12 degrees above zero. On average, Royal Oak has 16 rainy, 7 cloudy, 5 sunny, and 2 partly cloudy days in April. The rains are usually moderate. April as well as March, November, and December is considered the most uncomfortable time to visit Royal Oak.