On average, rainfall was most common at the start and end of the year. Use this monthly calendar to view weather averages, such as average temperature 14 days ahead of today, as well as the historical weather . The windiest month (with the highest average wind speed) is July (12.3mph). The weather has always been consistently sunny with occasional rain. This graph shows the average amount of daylight in Poipu in March based on historical data. In addition to the Kauai rainfall data, we want to share some of our personal experiences with Kauai weather. For comparison, the hottest month in Poipu, September, has days with highs of 81F (27C) and lows of 78F (26C). The months with the lowest atmospheric pressure are September and October (29.98"Hg). 14 Days. We will be staying in Kauai from Aug 13-21 and in Maui from Aug 22-28. Unit Settings . and took the arithmetic mean. Scan the QR code or enter your mobile number. He had narrowed down his choices, 2013 UPDATES: July 4th Fireworks Oahu 2013 The islands of Hawaii have some fantastic fourth of July events planned for 2008. In more common terms of how much that is, some would describe it as not rainy at all. The closest water of Poipu is Pacific Ocean. Rainfall In July, in Poipu, the rain falls for 20.9 days. What are your thoughts on staying somewhere near the north shores around this time? are we ready to much into the weather report? Room amenities were top notch and the grounds were beautiful. We were thinking of a few days on Oahu to see a couple sites, then off to either Kauai or the Big Island for a week. //-->,