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NWS Honolulu Issues Flood Watch for Main Hawaiian Islands

September 8, 2026 · wweather1 editorial · 1 min read

The National Weather Service in Honolulu has issued a Flood Watch for Oahu, Maui County, and the Big Island from September 7 at 3:23 PM HST through September 8 at 6:00 PM HST.

The National Weather Service (NWS) Honolulu HI issued a Flood Watch on September 7 at 3:23 PM HST, which remains in effect until September 8 at 6:00 PM HST. The watch covers multiple areas across Oahu, Maui County, and the Big Island, including Maui, Lanai, Molokai, Kahoolawe, and surrounding regions.

Moisture moving along the eastern flank of Hurricane Lowell will bring periods of heavy rain to the main Hawaiian islands through Tuesday afternoon. Excessive rainfall from these conditions increases the risk of flash flooding across the affected locations.

Potential impacts include the closure of flood-prone roads and low-lying areas due to elevated runoff and overflowing streams. Additionally, urban areas may experience more significant flooding and potential property damage caused by rapid runoff.

Why it is dangerous and what to do

⚠️ Safety
• Monitor later weather forecasts for updated conditions.
• Be prepared to take action if Flash Flood Warnings are issued.
• Avoid driving or walking through flooded roads and low-lying areas.
📊 The numbers, from wweather1 data
Hilo: now +24°, Overcast.
That is 1° above the September climate norm.
The record for this date is +28° (2004).
Three-day forecast: 8 September: +30°/+23° · 9 September: +27°/+23° · 10 September: +25°/+23°
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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