January in South Lake Tahoe is the snowiest and the cloudiest month of the year. In January, the weather in South Lake Tahoe is typically cold. Average daily high temperature in January is about 4 degrees above zero. On average, South Lake Tahoe has 10 partly cloudy, 8 cloudy, 7 sunny, 4 snowy, and 2 rainy days in January. The snowfalls are usually heavy. January as well as February, March, April, and November is considered the most uncomfortable time to visit South Lake Tahoe.