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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°
Visiting Costa Rica in September & October. Costa Rica. The rainy season in Costa Rica usually lasts from May to early December, with the heaviest rains falling in September and October. In the early fall, places like [Manuel Antonio](d:) and [Arenal](d:) are hit with fairly steady rain.