The Big Island's sunny, sheltered Kona coast has Hawaii's warmest, clearest water for snorkeling and swimming. Here's what to know about each major beach.
📍 Kailua-Kona & West Hawaiʻi Island
The Kona coast benefits from a dry, sunny climate with minimal rainfall (Kailua-Kona averages less than 30 inches per year versus Hilo's 130+). This means very little freshwater runoff reaching the ocean — the primary cause of beach closures and elevated bacteria counts on other islands. Combine that with the lava coastline's natural filtration and strong ocean circulation from the Kona shelf, and you get consistently excellent water quality.
DOH testing data for Kona coast beaches consistently shows among the lowest bacteria counts in Hawaii. Even after the occasional heavy rain event, conditions typically recover much faster here than on the windward side.
Arguably the most beautiful beach on the Kona coast — a small cove of brilliant white sand with impossibly turquoise water, protected by black lava headlands. Located about 20 minutes north of Kailua-Kona off Queen Kaʻahumanu Hwy. Shallow and calm most days, great for swimming and snorkeling along the rocky edges. Very limited parking (fills by 8am on weekends); arrive early. Part of Kekāha Kai State Park. See our Kua Bay guide.
The best and most accessible shore snorkeling near downtown Kailua-Kona, just south of town on Alii Drive. A shallow, protected bay with a large resident turtle population and excellent reef fish diversity. Lifeguarded year-round. Water quality is generally good but can be affected by runoff after rain due to surrounding development. Check our Kahalūʻu Beach water quality page. Best snorkeling time: early morning before the crowds arrive.
A beloved local beach right on Alii Drive about 4 miles south of Kailua-Kona town. Famous for its sand periodically disappearing during high surf, then returning when conditions calm. When sand is present, it's a great swimming and bodyboarding spot with a fun local vibe. The water quality here is generally good. Lifeguarded. Very small parking lot. Check our Magic Sands Beach guide.
South Kona's finest shore snorkeling, adjacent to Puʻuhonua o Hōnaunau (Place of Refuge) National Historical Park. Named for the two natural lava ledge steps used to enter the ocean. No sandy beach — all snorkeling. Spectacular coral, fish, spinner dolphins, and turtles. Essentially no freshwater runoff — consistently excellent water quality. Arrive early before tour groups; there's very limited parking. Combine with a visit to the historical park next door.
Often ranked one of Hawaii's top beaches. A long, wide crescent of white sand on the Kohala coast about 35 minutes north of Kailua-Kona. Consistent excellent water quality, lifeguarded, full facilities. Large waves can develop in winter creating a fun bodysurfing break, but the south end is usually calmer. State park entry fee ($10/vehicle non-resident). See our Hapūna Beach guide.
A calm, protected beach near Puʻukoholā Heiau National Historic Site on the Kohala coast. Excellent for families with calm, clear water. Good snorkeling along the rocky edges. Full facilities, large free parking lot. One of the most family-friendly beaches on the Big Island with reliably good conditions. Lifeguarded on weekends.
The beaches within Kekāha Kai State Park north of Kailua-Kona include multiple white sand pockets accessible via short hikes through lava fields. Mahaiula Beach, Mahaiʻula, and Kikaua Beach are all accessible from the park. Pristine conditions — minimal development, no stream runoff, excellent water quality. Check our Kikaua Beach guide.
The Kona coast is frequently the warmest swimming water in all of Hawaii. Sheltered from trade winds, the water absorbs more solar heat than windward shores. Protected bays like Kahalūʻu and Kua Bay can reach 84–86°F in August and September. Even in winter, Kona water stays around 76–78°F — noticeably warmer than Kauaʻi's north shore at the same time of year.
See our Hawaii ocean temperature by month guide for full data.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — not affiliated with any government agency. Water quality ratings are estimates based on publicly available data and may not reflect current conditions.
Always verify current conditions with the Hawaii DOH Clean Water Branch before entering the water.
When in doubt, don't go out.