In April, the weather in South Lake Tahoe is typically cold. Average daily high temperature in April is about 9 degrees above zero. On average, South Lake Tahoe has 12 sunny, 10 partly cloudy, 5 rainy, 2 cloudy, and 1 snowy day in April. The rains are usually heavy. April as well as January, February, March, and November is considered the most uncomfortable time to visit South Lake Tahoe.