weather in puerto rico in september
September in Puerto Rico is characterized by heavy rainfall and a heightened chance of seeing severe tropical weather. Travelers can rest assured that their vacations will not be ruined as daily storms are generally short lived and occur in the late afternoon.y the early evening hours in September the temperature will generally fall to somewhere in the vicinity of 80.9 degrees. For the month of September as a whole, temperatures in Puerto Rico average around 81.6 degrees.