December in Oakland is the rainiest and the coldest month of the year. In December, the weather in Oakland is typically warm. Average daily high temperature in December is about 13 degrees above zero. On average, Oakland has 11 rainy, 9 sunny, 8 partly cloudy, and 3 cloudy days in December. The rains are usually heavy. December as well as January and February is considered the most uncomfortable time to visit Oakland.