Surf, weather, safety alerts, and the best beaches for 2026-05-15.
A passing tropical disturbance is bringing heavy rain and scattered thunderstorms to the Big Island starting today, with heightened storm risk due to warmer ocean temperatures and El Niño conditions. The west shore remains the safest bet for ocean activities — Hapuna and Spencer Beach Parks offer calm, lifeguarded waters outside the brown water advisory zones for Hilo Bay and the Hamakua Coast. Avoid swimming in advisory areas, pack rain gear, and monitor marine forecasts as conditions develop. Respect wildlife, especially monk seals-harassment cases are being prosecuted with fines up to $70,000.
Big Island · Best window: midday
high confidenceBig Island · Best window: morning
high confidenceBig Island · Best window: afternoon
medium confidenceBig Island · Best window: morning
medium confidenceBig Island · Best window: midday
low confidenceWest-facing beaches (Hapuna, Spencer) offer the calmest conditions today, with small surf (1-2 ft) and clear waters. A brown water advisory remains active for Hilo Bay and the Hamakua Coast-avoid swimming in these areas. Light winds (1-2 mph) prevail, with Hapuna experiencing light N winds and Kahaluʻu light SW winds. No active surf advisories, but monitor marine forecasts due to the tropical disturbance.
The Big Island is under a heavy rain and thunderstorm threat from a tropical disturbance, with patchy rain nearby and high chances of precipitation (63-82%). Temperatures are mild (71-72°F), with light winds (1-2 mph). Expect humid conditions and potential flash flooding-pack rain gear and plan indoor alternatives.
Heavy rain and thunderstorms are expected island-wide due to a tropical disturbance, with El Niño conditions increasing hurricane risk for Hawaii this season. A brown water advisory remains in effect for Hilo Bay and the Hamakua Coast-avoid swimming in these areas. Big Island vacation rentals face new registration rules starting July 1, 2026-check legality before booking. Respect wildlife: a Washington man was recently arrested for throwing a rock at an endangered monk seal.
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Disclaimer: This update is generated using AI and automated data sources including weather APIs, surf forecasts, and news feeds. It is not professional safety advice. Ocean conditions change rapidly and may differ from what is described here. Always check with on-site lifeguards, observe posted warning signs, and consult official sources such as the National Weather Service before entering the water. HawaiiYeah assumes no liability for injury, loss, or damage arising from use of this information. See our full disclaimer.