Oʻahu water quality is worsening (-79pp in 14 days)
Oʻahu ocean water quality worsened 79 percentage points over the last 14 days (100% advisory-free two weeks ago vs. 21% advisory-free now).
For a trip in the next week, prioritize islands with stronger structural protection (dry coasts, reef enclosure, no major streams). See cleanest Hawaiian island and BWA alternatives.
Big Island has been persistently advisory-free — the same baseline as the prior two weeks. 0 of our 7 tracked beaches on the island have active advisory days in the last 30 days. NOAA's 7-day forecast is mild — scattered showers possible but unlikely to drive new advisories. See the Big Island leaderboard for the beach-by-beach ranking.
Maui has been persistently advisory-free — the same baseline as the prior two weeks. 0 of our 6 tracked beaches on the island have active advisory days in the last 30 days. NOAA's 7-day forecast is mild — scattered showers possible but unlikely to drive new advisories. See the Maui leaderboard for the beach-by-beach ranking.
Oʻahu is worsening over the last 14 days (-79pp vs. the prior two weeks). Our 12 tracked beaches happen not to overlap with the DOH advisories driving this signal — the worsening trend is from island-wide or other-area advisory events. NOAA's 7-day forecast is wet (peak 62% chance of rain) — expect the pattern to shift toward more advisories. See the Oʻahu leaderboard for the beach-by-beach ranking.
Kauaʻi is stable — no significant change in the last 14 days. 0 of our 6 tracked beaches on the island have active advisory days in the last 30 days. NOAA's 7-day forecast is wet (peak 59% chance of rain) — expect the pattern to shift toward more advisories. See the Kauaʻi leaderboard for the beach-by-beach ranking.
For the always-live per-island outlook, see our Hawaii Water Quality Forecast, which regenerates daily from NOAA + DOH data.
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