Even though Kauai is home to Mount Waialeale, one of the wettest spots on earth, most days on the Garden Isle are filled with sunshine. Understanding Kauai’s weather before you pack helps you plan a smoother trip, since the island has seven main microclimates ranging from a lush interior to a more arid Westside.
Does the Weather Vary Around Kauai?
Mount Waialeale sits at an elevation of 5,148 feet and anchors Kauai’s unspoiled interior with an average of more than 450 inches of rain each year. Fortunately, most of that rain never reaches the coastline, where visitors spend the bulk of their vacation.
North Shore regions average 40 to 60 inches of rain per year, mainly during the winter months. The South Shore typically sees 30 to 40 inches annually, since the Haupu Mountain range blocks many showers before they arrive, though an occasional Kona storm can roll in from the Southeast, bringing some drama to the more consistent weather patterns. The Westside remains the driest part of the island, with some spots receiving as little as 5 inches of rain per year.
What Is the Weather Like on Kauai?
Thanks to our steady trade winds from the Northeast, Kauai’s humidity is moderate, and temperatures stay mild throughout the year. Visitors can expect a high around 85 degrees in summer and about 78 degrees in winter. Ocean temperatures shift too, generally ranging between 73 and 80 degrees depending on the season. No matter when you visit, expect pleasant temperatures.
Does Kauai Have Seasons?
Kauai really has only two seasons. Kau, the warmer season, runs from May to September and brings the most hours of daylight along with balmy nights. The beaches stay dry during the day, though light showers can still roll through the mountains and valleys after dark.
Hoʻoilo, the cooler season, lasts from December through March, with an average high near 78 degrees and lows around 62 degrees. Visitors headed upcountry to Kokee State Park during these months should pack an extra layer, since temperatures at elevation run noticeably cooler.
The rainiest months are usually November and March, though showers can appear anytime between November and April. Even during the wettest stretch, rain falls only about 15 percent of the time, and most of it lands in the interior rather than the coastline.
What If It Rains During My Vacation?
A cloudy morning on one side of the island rarely means a washed-out day everywhere. Keep these tips in mind.
- Search for the sun. Rain is unlikely to cover the entire island at once. The National Weather Service Kauai radar is the best resource for real-time conditions.
- Check the surf. The Kauai Explorer ocean report offers daily swim, snorkel and surf conditions. Waves tend to run calmer on the South Shore in winter and up North. In summer, this trend is normally reversed.
- Watch the wind. That is the direction the weather is coming from. Heavy clouds are a sign of rain coming, and a good opportunity to raise the top on your convertible.
- Pack a light jacket. A packable layer comes in handy for brief showers, especially in the winter months between November and March.
When it comes to rain, our biggest tip to visitors is to drive 10 minutes. You will likely find sunshine because Kauai’s rain showers pass quickly. Nothing is better than the smell of tropical flowers after a light rain. However, if the rain is persistent, check out our guide on rainy day activities.
Beautiful Accommodations on Kauai
No matter the forecast, having a comfortable home base makes every version of Kauai weather easier to enjoy. The team at Parrish Kauai offers a wide collection of Kauai vacation rentals across the island, including popular areas such as Poipu, Princeville, and Hanalei. With our rentals, guests have a covered lanai, full kitchens, and comfortable living areas to enjoy between rainy spells. Browse and book your stay online, or call us at 808-318-8384.
Our Local Weather Tip
When it comes to rain, our biggest advice is simple: drive 10 minutes. Kauai’s showers are often localized, and it’s common to leave a passing shower behind and find blue skies just a few miles away. One of our favorite things after a light rain is the scent of tropical flowers filling the air.