1. The Dry Season (June to September): This is the best time to visit the Galapagos Islands, as well as the Andean region. The weather is sunny, with little rainfall.
2. The Rainy Season (October to May): This season can be wet, but it is also warmer. It's a great time to visit the Amazon rainforest, as the water levels are higher and wildlife is more active.
3. The Shoulder Seasons (April and May, and September and October): These months offer a good mix of weather, with less rain than in the rainy season and warmer temperatures than in the dry season.