January in Santa Maria is the rainiest and the hottest month of the year. In January, the weather in Santa Maria is typically hot. Average daily high temperature in January is about 29 degrees above zero. On average, Santa Maria has 15 rainy, 11 sunny, 4 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February and December is considered the most uncomfortable time to visit Santa Maria.