March in Zihuatanejo is the sunniest and the coldest month of the year. In March, the weather in Zihuatanejo is typically warm. Average daily high temperature in March is about 26 degrees above zero. On average, Zihuatanejo has 26 sunny, 4 partly cloudy, and 1 cloudy day in March. March as well as January, February, and April is considered the most comfortable time to visit Zihuatanejo.