June in Port Antonio is the rainiest, the windiest, and the cloudiest month of the year. In June, the weather in Port Antonio is typically warm. Average daily high temperature in June is about 27 degrees above zero. On average, Port Antonio has 24 rainy and 6 sunny days in June. The rains are usually heavy. June as well as May, July, August, and September is considered the most uncomfortable time to visit Port Antonio.