Most importantly what you need to know about Panama is that it only has two seasons instead of the traditional four seasons. The high season or dry season starts in December and ends around the middle of March. The low season or wet season is from March to December. It’s kind of implied, but the dry season is when there is limited rain and the weather is more like a “summer” The wet season is just what it implies, its more wet. Similar to the Hawaiian Islands the rain usually comes in the afternoon and might go for an hour or so and then stop. You will occasionally have a full rainy day during the wet season, but its mostly showers that move in and out with the clouds. The months of September to November can be the perfect combination of these two with limited rains which means cooler weather, but its not wet and dreary!