What to expect for water quality, rainfall, and ocean conditions
Sandy Beach has excellent water quality year-round with no significant contamination sources. Advisory events are rare. The danger at Sandy Beach is always the powerful shore break, never bacteria.
April brings about 1 inch of rain to Sandy Beach. Conditions begin favoring south swells which create the powerful shore break this beach is famous for. Water quality is good with minimal runoff.
Winter swells from the east and northeast create powerful shore break. Sandy Beach is dangerous year-round but winter swells can produce unpredictable wave patterns. The beach is NOT for casual swimming in any season.
Moderate. The shoulder season between spring break and summer offers a good balance of pleasant weather and manageable crowds.
The Hawaii Department of Health recommends staying out of the ocean for at least 72 hours after heavy rain. In april, rainfall is less frequent but individual storms can still produce contaminated runoff.
When conditions are clear, Sandy 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. 🤙