September in Easter Island is the coldest month of the year. In September, the weather in Easter Island is typically warm. Average daily high temperature in September is about 19 degrees above zero. On average, Easter Island has 9 rainy, 8 sunny, 8 partly cloudy, and 5 cloudy days in September. The rains are usually light. September as well as June, July, October, and November is considered the most uncomfortable time to visit Easter Island.