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Get San Jose, Costa Rica typical December Weather including average and record temperatures from AccuWeather.com my recent locations Â°c San Jose, Costa Rica 27Â°
The average annual temperature is around 21 to 27 degrees Celsius (70 to 81 degrees Fahrenheit), with the coolest months being November, December, and January.Costa Rica has no distinct summer or winter period, which allows the country to enjoy an average of 12 hours of sunlight year-round.verage temperatures in the highlands are about 13 degrees Celsius, while in the lowlands it is approximately 26 degrees Celsius (79 degrees Fahrenheit). San Jose, in the central valley, enjoys the best weather with a moderate, temperate climate and average temperatures of 22 degrees Celsius (72 degrees Fahrenheit).