March in Foz do Iguaçu is the sunniest month of the year. In March, the weather in Foz do Iguaçu is typically hot. Average daily high temperature in March is about 28 degrees above zero. On average, Foz do Iguaçu has 16 sunny, 10 rainy, and 5 partly cloudy days in March. The rains are usually heavy.