Although Costa Rica is a small country in terms of area, there is a lot going on here in terms of weather in Costa Rica. With a climate that is diverse and varied, Costa Rica can be divided into several climatic zones, each of which are distinct and individual. Though generally classified as a tropical country because of its close proximity to the equator, Costa Rica has no real winter period, and the sun shines here throughout the year.
The main reason for the diversity in Costa Rica lies in the fact that Costa Rica has an ocean and a sea relatively close to each other, the Pacific Ocean and the Caribbean Sea.
In Costa Rica the average annual temperature is around 21 to 27 degrees Celsius or 70 to 81 degrees Fahrenheit and the coolest months of the year are November, December and January. The months March through May are the hottest months of the year, so make sure you protect yourself from the sun. There is no real summer or winter in Costa Rica and the rainy season here lasts from May to November, with the months of December through April having little to no rain and September and October being the heaviest rain period.