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HomeWeather news → NWS Honolulu Issues Flood Watch for Kauai, Niihau, and Oahu
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NWS Honolulu Issues Flood Watch for Kauai, Niihau, and Oahu

August 15, 2026 · wweather1 editorial · 2 min read

The National Weather Service in Honolulu has issued a Flood Watch for Kauai, Niihau, and Oahu from Saturday evening through late Sunday night due to Tropical Cyclone Lala.

The National Weather Service in Honolulu issued the Flood Watch on August 14 at 2:44 PM HST, remaining in effect until August 17 at 6:00 AM HST. Tropical Cyclone Lala is expected to bring heavy rain to the Big Island and Maui County from this evening through Sunday, and to Oahu, Kauai, and Niihau from Saturday evening through late Sunday night.

Current forecasts indicate rainfall totals of 4 to 6 inches across the watch areas, with localized amounts reaching up to 8 inches. The highest rainfall amounts are anticipated over windward sections.

Excessive rainfall may lead to flash flooding. Runoff and overflowing streams may cause closures of flood-prone roads and low-lying areas, while rapid runoff in urban areas could cause significant flooding and property damage.

The alert covers Niihau, all regions of Kauai, and Oahu, including Central Oahu, Honolulu Metro, East Honolulu, Ewa Plain, Oahu North Shore, Olomana, and the Koolau and Waianae areas.

Why it is dangerous and what to do

⚠️ Safety
• Monitor later weather forecasts for updated information.
• Be prepared to take action if Flash Flood Warnings are issued.
• Avoid driving or walking through flooded low-lying areas and roadways.
📊 The numbers, from wweather1 data
Honolulu: now +26°, Drizzle.
That is 2° above the August climate norm.
The record for this date is +31° (2025).
Three-day forecast: 15 August: +30°/+25° · 16 August: +27°/+24° · 17 August: +29°/+24°
The figures are computed automatically from the Open-Meteo/ERA5 archive — no eyeball estimates.
📰 Data source: NWS. Forecast and analysis — wweather1, based on Open-Meteo / met.no data.

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