What to expect for water quality, rainfall, and ocean conditions
Heavy winter rain increases Anahulu River discharge at Haleiwa Beach. Contaminated agricultural and residential runoff flows directly into the bay. Bacteria levels near the river mouth are frequently elevated.
January at Haleiwa Beach Park brings about 4 inches of rain. The Anahulu River discharges directly into the bay at Haleiwa, carrying sediment and bacteria from the agricultural and residential watershed. Post-rain water quality near the river mouth is poor.
Winter north swells affect the outer portions of Haleiwa Bay, though the inner beach park area stays more sheltered than exposed North Shore breaks. Water temperature is 75-77°F. The Anahulu River mouth creates variable currents.
Moderate. Haleiwa Beach Park gets moderate use in winter. Most North Shore visitors head to the famous surf breaks. The beach park is popular with locals and families.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. In january, this is especially important as wet-season storms can produce heavy rainfall and significant runoff.
When conditions are clear, Haleiwa Beach has excellent ocean activities. Check the water quality above, then book with confidence.
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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
⚠️ 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. 🤙