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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°
Weather in Argentina in December. The average maximum daytime temperature in Argentina in December is a warm 28Â°C (82Â°F) with moderate heat & humidity. There are usually 8 hours of bright sunshine each day, which represents 57% of the 14 hours of daylight. The average sea temperature in and around Argentina in December is 23Â°C (73Â°F). Expect 92mm (3.6 inches) of rainfall across the whole of December with 9 days with some rain falling. Maximum UV levels will be extreme (11+ UV index) at midday when the skies are clear.