A tropical disturbance brings heavy rain and thunderstorms to the Big Island. West shore beaches (Hapuna, Spencer) remain safest-calm, lifeguarded, and outside brown water advisory zones.
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.
Currently posted advisories from the Hawaii Department of Health affecting Big Island. Source: official DOH Clean Water Branch.
Posted May 15, 2026
Full advisory at health.hawaii.gov →Posted Apr 30, 2026 · Hilo bay and along the Hamakua Coast
Full advisory at health.hawaii.gov →Posted Apr 2, 2026 · Ninole area
Full advisory at health.hawaii.gov →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 confidenceStick to west-facing beaches like Hapuna or Spencer-calm, lifeguarded waters are safest. Avoid Hilo Bay and Hamakua Coast due to the brown water advisory. Pack rain gear, sun protection, and check DOH updates before entering.
Hapuna and Spencer Beach Parks are your best bets-shallow, calm waters and lifeguards. Supervise kids closely, even in sheltered areas. Bring indoor backups (e.g., Imiloa Astronomy Center, Lyman Museum) if rain moves in.
Carlsmith and Kahaluʻu offer decent snorkeling, but avoid Hilo Bay and Hamakua Coast due to the brown water advisory. Monitor surf reports for Kahaluʻu if conditions improve. Windward shores may have stronger currents-stick to west-facing beaches. Respect wildlife and report monk seal harassment immediately.
West-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.
Sources
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.