April in San Carlos is the cloudiest month of the year. In April, the weather in San Carlos is typically hot. Average daily high temperature in April is about 30 degrees above zero. On average, San Carlos has 19 rainy, 7 cloudy, 2 sunny, and 2 partly cloudy days in April. The rains are usually heavy. April as well as May, June, July, and August is considered the most uncomfortable time to visit San Carlos.