The Osa Peninsula is quite temperate and rarely experiences extreme high or low temperatures. The temperature seldom drops below 27°C (80°F) in the green season (May to September), and is usually around 35°C (95°F) in the dry season (December to April). October and November are considered the rainiest months (wet season) and because of this travel to and around the Osa can be difficult.
If you’re wondering during which season it’s best to visit, the green season or the dry season, we recommend both for different reasons. Of course in the dry season there is no rain so that’s a plus if you want to spend most of your time on the beach (or get away from the snow and cold). However, if you are more into seeing wildlife, you will enjoy the green season. That’s when the turtles return and red-eye-tree-frogs can be seen everywhere. As for the weather during the green season, you can compare it to the springtime where mornings are usually sunny but you get some afternoon and overnight showers. The great thing about the rain here is that it’s nice and hot and gives you a great excuse to relax.