UPDATE: Coastal flooding now likely through late Sunday night along Big Island shorelines

Update at 5:04 p.m. Aug. 7, 2025: Forecasters with the National Weather Service office in Honolulu extended the time frame for expected coastal flooding this weekend, with flooding now expected along island shorelines and in low-lying coastal areas through late Sunday night.

The extension comes as forecasters also issued a high surf advisory for south-facing shores of the state that will be in effect from early Friday morning to early the morning of Aug. 11.

Original post at 11:04 p.m. Aug. 6, 2025: Peak afternoon high tides combined with elevated water levels running about 6 inches higher than predicted, plus a large south swell filling in throughout the island chain will lead to minor flooding along Hawai‘i shorelines and in low-lying coastal areas through Saturday.

That includes those of the Big Island.

Forecasters with the National Weather Service office in Honolulu say isolated minor coastal flooding is likely during high tides from Aug. 7 through Saturday afternoon.

Water levels should fall below coastal flooding thresholds during peak afternoon high tides Sunday.

Flooding of beaches that are normally dry, minor coastal erosion and saltwater inundation are possible.

The public is advised to avoid driving through flooded roadways. If you are forced to drive through salt water, be sure to rinse your vehicle with fresh water as soon as possible.

Move electronics, vehicles and other valuables to higher ground.

Monitor vessels to ensure mooring lines don’t get too tight and watch out for overwash around boat ramps. Secure canoes or other watercraft stowed on beaches.

You can also submit your coastal flooding photos to the University of Hawai‘i Sea Grant College Program Hawai’i and Pacific Islands King Tides Project website.