The Ritz Carlton O’ahu, Turtle Bay beach forecast: weather, water & waves
North Shore, HI · Oʻahu, United States · 21.705, -157.999
Updated : very low seaweed, beach grade A-, sea 78°F.
Veabird's call
Monday is the pick: little seaweed and mostly dry.
Best months ahead: September (A-) and October (A-); seaweed is usually lowest in December.
Grades from Veabird's beach forecast. Updated Nov 13, 01:00 UTC.
Tell me when The Ritz Carlton O’ahu, Turtle Bay grades A
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Questions about The Ritz Carlton O’ahu, Turtle Bay
Does The Ritz Carlton O’ahu, Turtle Bay get sargassum (seaweed)?
No. Atlantic sargassum does not reach Hawaii.
How warm is the water at The Ritz Carlton O’ahu, Turtle Bay?
About 79°F in November. The sea is warmest in September (about 81°F) and coolest in March (about 76°F).
When is the best time to visit The Ritz Carlton O’ahu, Turtle Bay?
For warm water and dry weather, aim for September through February. September is usually the quietest of those, with about 15 rainy days and a sea near 81°F.
When is hurricane season at The Ritz Carlton O’ahu, Turtle Bay, and how often do storms hit?
The central Pacific hurricane season runs June through November. A tropical storm passed within 86 miles of The Ritz Carlton O’ahu, Turtle Bay in 3 of the 55 seasons from 1971 to 2025, and a hurricane within 58 miles in 1. The riskiest stretch is around July 23, when the chance of a storm passing in any one week is about 1% or less; across all of August it is about 2%.
Sargassum season at The Ritz Carlton O’ahu, Turtle Bay
The Ritz Carlton O’ahu, Turtle Bay sits outside the reach of the Atlantic sargassum belt; seaweed landings are rare in any month.
Oʻahu month by month
Typical weather, water temperature, seaweed and crowds for every month: the best time to visit Oʻahu.
Weather & water by month at The Ritz Carlton O’ahu, Turtle Bay
Average highs run from about 78°F in February to 85°F in August and September. The sea is warmest in September (about 81°F) and coolest in March (about 76°F). January is usually the driest, with about 12 rainy days; April and July are the wettest, with about 20 rainy days.
| Month | Avg high | Sea | Rainy days |
|---|---|---|---|
| Jan | 79°F | 77°F | 12 |
| Feb | 78°F | 77°F | 13 |
| Mar | 79°F | 76°F | 17 |
| Apr | 80°F | 77°F | 20 |
| May | 81°F | 78°F | 19 |
| Jun | 83°F | 79°F | 16 |
| Jul | 83°F | 79°F | 20 |
| Aug | 85°F | 80°F | 16 |
| Sep | 85°F | 81°F | 15 |
| Oct | 84°F | 80°F | 15 |
| Nov | 82°F | 79°F | 14 |
| Dec | 79°F | 78°F | 13 |
Monthly averages from 6 years of ERA5 reanalysis (Open-Meteo) for this area's 0.5° grid cell; rainy days have at least 1 mm (0.04 in). Any given year can differ.
Cleanup & barriers
- Offshore barriers
- Not needed: Atlantic sargassum does not reach Hawaii.
- Public cleanup
- Volunteer groups (Sustainable Coastlines Hawaiʻi, Hawaiʻi Wildlife Fund) clear ocean plastic, heaviest on windward shores.
- Resort crews
- Resort crews groom beaches daily.
- Typical clearing time
- n/a
Safety notes
Domestic travel (no State Dept advisory)
- Winter swells (Nov–Mar) make north- and west-facing shores dangerous; summer swells hit south shores.
- Shorebreak and rip currents cause most visitor injuries: swim at lifeguarded beaches.
- Hawaiʻi bans sunscreens with oxybenzone and octinoxate.
- Stay 50 ft from monk seals and 10 ft from sea turtles.
- Box jellyfish can reach leeward beaches 8–10 days after a full moon.
Check official advisories and local flags before swimming. Decomposing sargassum releases hydrogen sulfide; avoid heavy piles.
Things to do near North Shore, HI
- Pearl Harbor National Memorial
- Hanauma Bay snorkeling (reservations)
- Diamond Head hike
- North Shore surf (winter)
- Lanikai & Kailua beaches
Fly in for the best beach days
Suggested dates are a week in December. Change them to match the live forecast above.
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Nearest airports
- Honolulu Intl (HNL), ~44 km
Nearby resorts
- Four Seasons O'ahu at Ko Olina Ko Olina, HI · 43 km
- Marriott's Ko Olina Beach Club Ko Olina, HI · 43 km
- Barbers Point Beach Cottages Ko Olina, HI · 46 km
- Ac Hotel By Marriott Honolulu Honolulu, HI · 46 km
- Hilton Hawaiian Village Waikīkī, HI · 50 km
- Hale Koa Waikīkī, HI · 50 km
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