In March, the weather in Puerto Iguazú is typically hot. Average daily high temperature in March is about 30 degrees above zero. On average, Puerto Iguazú has 13 rainy, 12 sunny, 3 cloudy, and 3 partly cloudy days in March. The rains are usually heavy. March as well as January, February, October, and December is considered the most uncomfortable time to visit Puerto Iguazú.