When to Visit Iguazu Falls
Wet Season - December through March
December through March is the summer rainy season at Iguazu Falls, featuring higher temperatures and a significant increase in the water power and spray emanating from the falls. Due to the higher volume of water, the falls are most impressive and continuous during this period. However, depending on the amount of rain, it could lead to closure of specific sectors of either National Park, especially San Martin Island and the Devil's Throat. Yet if your prepared for the elements and have a nice comfortable hotel with views to seek refuge, visiting during this time can be as good as any.
Dry Season - May through August
Due to the tropical climate and proximity to the equator, it rains year-round at Iguazu Falls. However, May through August, during the dry season, it rains slightly less, the humidity drops, and especially June through August, the winter season, the temperatures also drop slightly, which makes the area much more enjoyable for walking the exposed trails on the Argentinian side of the falls. Since temperatures can fluctuate during the day, we recommend dressing in layers and bringing a towel or change of clothes if you're planning to explore the wet areas of the trails or take a boat trip.
Brazilians and Argentinians flock to Iguazu Falls during their national holidays, especially January and February. Many of the hotels and lodges at the destination fill up with minimum stay requirements. If possible, it's always recommended to travel outside these dates for less crowds and more flexibility with lodging. While Brazil and Argentina have distinct National holidays to North America and Europe, you will find that the holidays of Christmas and Easter mutually popular.