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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.
Sep 14, 2007, 11:16 AM. I've taken all my trips to Costa Rica during the rainy season. Typically it will be nice in the mornings and then rain for an hour or two in the afternoons or evening and then clear up again. Tamarindo is in a pretty dry area and the only time they get a lot of rain is in September-October.