What is Waimea Bay water quality like in May?

May at Waimea Bay is typically characterized by low bacteria risk based on seasonal rainfall patterns. May brings calm conditions to Waimea Bay. Dry conditions and calm seas make Waimea Bay an excellent swimming destination. Waimea River discharge is minimal. Water quality is good.

Does it rain at Waimea Bay in May?

May is part of Hawaii's dry season (April through September). Waimea Bay sees significantly less rainfall during this period. Rain is infrequent and brief when it does occur. Water quality is generally at its best during dry months.

Is May a good time to swim at Waimea Bay?

May at Waimea Bay has low bacteria risk based on historical patterns. Summer transforms Waimea Bay into a calm swimming lagoon. Conditions in may are generally favorable for ocean activities at Waimea Bay. Always check the live advisory status above and use the 72-hour rain rule.

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Oʻahu · North Shore

Waimea Bay Water Quality in May

What to expect for water quality, rainfall, and ocean conditions

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May Conditions at Waimea Bay

May Advisory Risk Low

Dry conditions and calm seas make Waimea Bay an excellent swimming destination. Waimea River discharge is minimal. Water quality is good.

🌧️ Rainfall & Runoff

May brings calm conditions to Waimea Bay. The bay transforms from a dangerous winter surf spot into a calm swimming lagoon. North swells are rare. Water quality is good with reduced rainfall.

🌊 Ocean Conditions

Summer transforms Waimea Bay into a calm swimming lagoon. The water is flat, clear, and warm (79-80°F). The famous jumping rock draws crowds. Snorkeling is possible along the rocky north side of the bay.

👥 Crowd Levels

Moderate. The shoulder season between spring break and summer offers a good balance of pleasant weather and manageable crowds.

📌 May Notes

•In summer, Waimea Bay's calm waters make the famous jumping rock a popular activity. The rock sits about 25 feet above the water. Jump at your own risk and check depth conditions.

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If It Looks Brown, Don't Swim

Never enter the ocean when the water appears brown or murky, even if no advisory is posted. Hawaii is often slow to test beaches and update advisories — not every beach is monitored. After heavy rain, wait at least 72 hours and until the water clears before swimming.

Learn more about brown water advisories →

⚠️ The 72-Hour Rain Rule

The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. In may, rainfall is less frequent but individual storms can still produce contaminated runoff.

Book Tours & Activities

When conditions are clear, Waimea Bay has excellent ocean activities. Check the water quality above, then book with confidence.

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Waimea Bay — Other Months

Waimea Bay in January→ Waimea Bay in February→ Waimea Bay in March→ Waimea Bay in April→ Waimea Bay in June→ Waimea Bay in July→ Waimea Bay in August→ Waimea Bay in September→ Waimea Bay in October→ Waimea Bay in November→ Waimea Bay in December→

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Safe to Swim Hawaii provides water quality information based on publicly available DOH data and seasonal patterns. This is not medical or safety advice. Always check current conditions, obey posted signs, and use your own judgment before entering the ocean. Privacy Policy