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