Heavy rain and flash flooding risks dominate the Big Island. Ocean conditions are hazardous—stick to indoor plans or sheltered spots.
The Big Island is under a flood watch through Friday, with heavy rain and flash flooding risks making ocean activities unsafe. Runoff, bacteria advisories, and rising stream levels mean murky or brown water is off-limits. If you’re visiting, prioritize indoor activities or sheltered beach parks with lifeguards. Avoid windward shores and river mouths—conditions can deteriorate rapidly. Stay updated on advisories and have a backup plan.
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medium confidenceBig Island · Best window: morning
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medium confidenceSkip the ocean today. If you must visit a beach, stick to enclosed areas like Onekahakaha’s lagoon or Spencer Beach Park’s breakwall. Avoid murky water—it’s likely contaminated. Pack rain gear and have an indoor backup plan (museums, aquariums, shopping).
Avoid open-water beaches. Onekahakaha’s lagoon or Spencer Beach Park’s sheltered areas are your safest bets if you need outdoor time. Supervise kids closely, even in shallow water. Bring rain covers for strollers and plan indoor activities (e.g., Lyman Museum, Pacific Tsunami Museum).
This is not a day for open-ocean activities. If you’re determined to get in the water, stick to lifeguarded beaches like Hapuna or Spencer, and avoid areas with visible runoff. Monitor weather updates—conditions can worsen rapidly. Postpone snorkeling or surfing until advisories lift.
Hazardous conditions prevail due to heavy rain, runoff, and flash flooding risks. West-facing beaches (Hapuna, Spencer) may offer brief calm windows, but murky or brown water indicates contamination—avoid it. Windward shores are choppy with strong currents, and river mouths are dangerous due to rising stream levels. The National Weather Service warns of rapid runoff from saturated soils, increasing flood risks. Check for active advisories before entering the water.
Heavy rain and thunderstorms are expected through Friday, with 4–10 inches of rainfall on the Big Island and locally higher amounts. Flash flooding and landslides are likely, especially in low-lying and urban areas. Winds will gust up to 30 mph, and temperatures will hover in the mid-60s to low 70s. Humidity is high, making rain feel heavier. The National Weather Service’s flood watch is in effect statewide until Friday afternoon. Prepare for rapidly changing conditions—pack rain gear and monitor updates.
The Big Island is under a flood watch as heavy rain returns, with flash flooding risks highest in low-lying areas. Counties are preparing for more flooding, clearing canals and urging residents to stay alert. A Presidential Disaster Declaration has been approved, providing federal assistance for recovery efforts. Merrie Monarch Festival is underway in Hilo—check for event updates due to weather. Avoid murky water, as bacteria and sewage advisories remain in effect.
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.