Top Reasons to Live in Poipu Hawaii The island of Kauai is well-known for being one of the rainiest on earth, but Poipu is a welcome change of pace. Its sunny climes keep the temperatures down in winter and offer a cool breeze in the summer. Winter temperatures are typically in the mid-70s, while summer highs can climb into the upper 80s. Even in the rainiest months, showers tend to come in short...