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Weather in September in Costa Rica. September is one of the rainiest months of the year on the west side and in the mountains of Costa Rica and one of the driest months on the east side. The Pacific beaches and central region get significant rain most days; generally with a pattern of sunny mornings followed by showers in the afternoon or evening.
What is the weather like in September - Costa Rica Forum. What is the weather like in September. I will be arriving in San Jose in September and am wondering what to expect from the weather. From there I will be staying in the hotel Nayara around the Arenal area. Also is it pretty easy to get through SJO San Jose Airport?