A weather summary for the month of September in Hacienda El Paseo/Grecia during the period from the beginning of April to the end of September appears below.
In Costa Rica, September falls in the middle of the rainy or "green" season and is generally marked by more days with rain and lower daily high temperatures. On rainy days, at least in the area where we live, a day often (but not always) begins with a sunny morning. Around 11 am to 1 pm clouds begin to drift in holding the high temperature down. Then the rain starts and will typically continue for two or three hours.
The number of rainy days in September this year was the most we have encountered in any single month since moving to Hacienda El Paseo. Even though we were not here during earlier months (January, February, March), it is safe to say that there was no month which would have had more rainy days than September. The earlier months were all in the Costa Rican “dry” season.
The current rainy or green season should continue until late November or early December. Then begins the next dry season.