With a ceiling fan on, by late night, wed start to feel comfortable in the condo. We typically travel here late Oct/early Nov to avoid the crowds. Best wishes! - See 2 893 traveller reviews, 1,874 candid photos, and great deals for Ko`a Kea Resort On Poipu Beach at Tripadvisor. GRAPH. On average, rainfall was most common at the start and end of the year. Can we expect more sunny days than what it is showing? The following map shows the annual rainfall by area. See more current weather Annual Weather Averages Near Poipu Beach Averages are for Lihue Lihue Airport, which is 11 miles from Poipu Beach. In Poipu in December, there's a 11% chance of rain on an average day. to visit the beach. This graph shows the average amount of daylight in Poipu in December based on historical data. I wouldnt be concerned if the weather forecast said showers, but it is saying Thunderstorms most of our days there. There are no guarantees for better weather, but based on history and probability its a safer bet. Let us know how it goes. Rain in Hawaii brings some benefits that we tourists enjoy. What is the month with the lowest UV index in Poipu? The average total rainfall in Poipu Beach in January is 14.4cm and on average there are 19.3 rainy days in January making it a wet time to visit the beach. The wettest month in Poipu is February where a typical day has a 11% chance of precipitation and gets 0.08 inches (2.0 mm) of precipitation, while the dryest month in Poipu is June where a typical day has a 4% chance of precipitation and gets 0.09 inches (2.2 mm) of precipitation.