In March, the weather in Foz do Iguaçu is typically hot. Average daily high temperature in March is about 30 degrees above zero. On average, Foz do Iguaçu 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 Foz do Iguaçu.