February in Santa Rosa is the rainiest and the coldest month of the year. In February, the weather in Santa Rosa is typically warm. Average daily high temperature in February is about 16 degrees above zero. On average, Santa Rosa has 14 sunny, 7 rainy, 7 partly cloudy, and 1 cloudy day in February. The rains are usually heavy. February as well as January, March, and December is considered the most uncomfortable time to visit Santa Rosa.