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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°
September Weather. The weather in Costa Rica during the month of September is one of extremes. Generally the Pacific side is at its rainiest, while the Caribbean side is experiencing the best weather of the year. The Northwest Pacific is the driest area on the Pacific side. Temperatures will be in the low to mid 80s during the day and a little cooler in the evening.