January in Puerto Iguazú is the rainiest, the cloudiest, and the hottest month of the year. In January, the weather in Puerto Iguazú is typically hot. Average daily high temperature in January is about 31 degrees above zero. On average, Puerto Iguazú has 17 rainy, 8 sunny, 5 partly cloudy, and 1 cloudy day in January. The rains are usually heavy. January as well as February, March, October, and December is considered the most uncomfortable time to visit Puerto Iguazú.