April in San Cristobal de las Casas is the warmest month of the year. In April, the weather in San Cristobal de las Casas is typically warm. Average daily high temperature in April is about 24 degrees above zero. On average, San Cristobal de las Casas has 16 rainy, 7 partly cloudy, 5 sunny, and 2 cloudy days in April. The rains are usually heavy.