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TREND REPORT

Hawaii Water Quality — June 15, 2026

Maui water quality is improving (+50pp in 14 days)

BIG ISLAND
Steady (21% of days with no DOH advisory anywhere)
MAUI
+50pp improving
OʻAHU
-29pp worsening
KAUAʻI
Steady (79% of days with no DOH advisory anywhere)

Maui ocean water quality improved 50 percentage points over the last 14 days (50% advisory-free two weeks ago vs. 100% advisory-free now).

If the NOAA 7-day outlook stays dry, the improving trend should continue. See the Maui leaderboard for which individual beaches drove the change.

Where the islands stand today

Big Island

stable

Big Island is stable — no significant change in the last 14 days. 0 of our 7 tracked beaches on the island recorded one or more advisory days in that 30-day history window. NOAA's 7-day forecast is dry, so the current pattern should hold. See the Big Island leaderboard for the beach-by-beach ranking.

Maui

improving

Maui is improving over the last 14 days (+50pp vs. the prior two weeks). 1 of our 6 tracked beaches on the island recorded one or more advisory days in that 30-day history window. NOAA's 7-day forecast is dry, so the improving trend should continue. See the Maui leaderboard for the beach-by-beach ranking.

Oʻahu

worsening

Oʻahu is worsening over the last 14 days (-29pp vs. the prior two weeks). 1 of our 12 tracked beaches on the island recorded one or more advisory days in that 30-day history window. NOAA's 7-day forecast is mild — scattered showers possible but unlikely to drive new advisories. See the Oʻahu leaderboard for the beach-by-beach ranking.

Kauaʻi

stable

Kauaʻi is stable — no significant change in the last 14 days. 6 of our 6 tracked beaches on the island recorded one or more advisory days in that 30-day history window. NOAA's 7-day forecast is mild — scattered showers possible but unlikely to drive new advisories. See the Kauaʻi leaderboard for the beach-by-beach ranking.

NOAA 7-day forecast, per island tourist coast
  • Kohala Coast, Big Island: dry (max 11% chance of rain across next 7 days)
  • South Maui (Wailea / Kihei): dry (max 5% chance of rain across next 7 days)
  • South Shore O’ahu (Honolulu / Waikiki): mild (max 35% chance of rain across next 7 days)
  • Po’ipu, Kaua’i: mild (max 48% chance of rain across next 7 days)

For the always-live per-island outlook, see our Hawaii Water Quality Forecast, which regenerates daily from NOAA + DOH data.

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Methodology: The island trend uses Hawaii DOH island-wide advisory-day history where available: a day counts as advisory-free only when no DOH advisory was recorded anywhere on that island. If island history is unavailable, the generator labels its tracked-beach-fraction fallback explicitly. The separate beach list summarizes 31 tracked beach histories. Forecast data comes from NOAA National Weather Service (api.weather.gov) at each island’s primary tourist coast. This report is not a swim recommendation; always check the individual beach page and current local conditions before entering the water.