Trade wind side: wetter, greener, fewer tourists, and some of Hawaiʻiʻs best beaches.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. The windward side receives significantly more rain than Waikiki. Kailua Beachʻs north end is affected by Kawainui Marsh drainage. Always check conditions after rain.
The windward coast of Oʻahu faces the northeast trade winds. The Koʻolau Mountains wring moisture from these winds, creating the lush, green landscape that defines this side of the island. Fewer tourists venture here, but the beaches — Kailua, Lanikai, Waimanalo — are among Hawaiʻiʻs finest.
Length: 2.5 miles of white sand
Facilities: Lifeguards, restrooms, showers, kayak rentals, parking
Character: Repeatedly voted best beach in the US. Turquoise water, gentle waves, offshore islands (the Mokes).
Water quality note: The north end near Kawainui Marsh can have elevated bacteria after rain. The marsh drains through a channel into the north end of the beach. The south end (near Lanikai) is generally cleaner.
Access: 11 narrow public access paths between houses. No signs, no parking lot, no restrooms, no lifeguards.
Character: Postcard-perfect. Calm, clear water with the Mokulua Islands offshore. Residential neighborhood — do not park in driveways or on lawns.
Water quality note: Generally cleaner than the north end of Kailua because there is no significant stream or marsh outlet.
Length: 3.5 miles — the longest sandy beach on Oʻahu
Character: Less touristy, more local. Wider beach with fine white sand backed by ironwood trees. Bellows Field Beach (military beach open to the public on weekends) is at the south end.
Water quality note: Generally good due to open-ocean exposure, though stream outlets along the beach can create localized contamination after rain.
Character: Large, shallow bay. Not a swimming destination. Murky water from freshwater input and enclosed shape.
Activities: Kaneohe Sandbar tours (wade on the sandbar at low tide), kayaking, fishing. Heʻeia Fishpond is a restored Hawaiian aquaculture site.
Water quality note: The bay has chronic turbidity and elevated bacteria counts. Multiple streams drain into it. Not recommended for ocean swimming.
Top-rated experiences in the area.
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⚠️ Important Disclaimer
Safe to Swim Hawaii is an independent passion project — not affiliated with the Hawaii Department of Health or any government agency. Water quality ratings are estimates based on publicly available testing data and geographic analysis. They are not real-time measurements and may not reflect current conditions.
Always verify current water quality conditions with the Hawaii DOH Clean Water Branch before entering the water.
When in doubt, don't go out. 🤙