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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.
In Jaco, average preciptiation for these months is about 5 inches, a lot of which will fall in five or six really heavy rains. Temperatures are slightly cooler, with daytime high temperatures around 84 being typical. September and October are the rainy season or some say the wet season for Jaco Costa Rica weather.hile 24 hour averages fall in a narrow range throughout the year, the high temperatures in the dry season are noticably higher, in the 90s instead of the 80s. Downtown is very hot from 10 or 11 until 4 or 5. It is up to 10 degrees cooler on the low slopes of the jungle covered mountains surrounding Jaco Costa Rica.