West Kaua’i

Tonight: Partly cloudy. Isolated showers after midnight. Lows around 69 near the shore to around 60 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Friday: Breezy. Mostly sunny with isolated showers. Highs 82 to 88 near the shore to around 75 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Friday Night: Partly cloudy. Isolated showers after midnight. Lows around 69 near the shore to around 60 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 68 to 73. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Friday: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 76 to 87. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Friday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 68 to 74. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows around 65 in the valleys to around 55 above 4000 feet. East winds 10 to 15 mph decreasing to up to 15 mph after midnight. Chance of rain 70 percent.

Friday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 73 to 79 in the valleys to around 66 above 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 70 percent.

Friday Night: Mostly cloudy with scattered showers. Lows around 65 in the valleys to around 55 above 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 61 to 72. East winds up to 15 mph increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 69 to 83. East winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 61 to 72. East winds around 10 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 64 to 74. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 76 to 83. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 64 to 74. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Breezy trades will gradually weaken through the weekend as a broad low pressure system developing to the far north disrupts the surface ridge extending over the islands. Clouds and showers will favor windward and mauka areas through Friday, then sea breezes will shift the focus to island interiors each afternoon over the weekend. Early next week, increasing moisture will move up the island chain from the southeast, increasing rain chances for the eastern end of the state Monday and Tuesday. Moderate to locally breezy trades are expected to return by midweek next week.

Update

The current forecast remains on track, therefore no amendments were made for the evening update. Latest radar and satellite imagery still displays isolated to scattered showers propelling across windward and mauka locations this evening, with moisture upstream suggesting this trend will persist through the next several hours, despite limited accumulation as a result. Trades remain breezy, but will noticeably weaken in the next day or so.

Prev discussion

Issued at 322 PM HST Thu May 28 2026 The strong surface ridge to north of the state that is driving breezy trades across the area this afternoon will gradually weaken through the weekend as a broad low pressure system develops to the far north. As a result, the trades will ease allowing land and sea breezes to develop over the weekend into early next week, increasing the chance of seeing leeward and interior clouds and showers each afternoon, followed by clearing overnight.
A weak upper level trough will quickly pass overhead Friday through Saturday, weakening the low level inversion and possibly allowing for some slight enhancement of any showers that move in on the weakening trades or that develop over island interiors with the sea breeze activity each afternoon, but available moisture will be fairly limited.
Model guidance suggests that moisture levels will trend upwards sometime Monday night through Wednesday as a large plume of tropical moisture moves up the island chain from the southeast. At the same time, surface and mid level ridging will begin to build back over the area, allowing the trades to gradually become reestablished by midweek, likely focusing that moisture along windward and mauka areas with an uptick in shower activity.

Aviation

Moderate to breezy trades through today then decreasing over the weekend. Low cigs and SHRA along windward and mauka locations. MVFR conds possible in SHRA otherwise VFR prevails.
AIRMET Tango remains in effect for mod turb across all islands downwind of terrain.

Marine

Fresh to strong trade winds will persist through Friday as the subtropical ridge remains strong north of the state. This will support a possible extension of the Small Craft Advisory through Friday afternoon for the windier waters around Maui and the Big Island. Thereafter, guidance depicts the ridge beginning to weaken in response to broad low pressure developing roughly 1,500 nautical miles north of the islands near the Aleutian Islands this weekend through early next week. This will translate to local trades easing into the light to moderate range, likely giving way to localized land and sea breezes near the coasts late this weekend through early next week. A return of moderate to fresh easterly trades is likely by midweek as the ridge strengthens.
An active pattern is in store for surf along south-facing shores as we head into June due to a series of recent gale- to storm- force lows passing through our swell window near New Zealand over the past week. Expect surf to gradually build through Friday as long-period south-southwest forerunners arrive while the current medium-period south swell lingers. Surf heights will likely reach advisory levels Friday night, with the swell becoming fully established by Saturday. Heights will likely remain near advisory levels through the weekend. As the swell gradually begins to ease early next week, long-period forerunners from the next south- southwest swell are expected to arrive. Heights may briefly dip below advisory levels Monday night, but as the next swell fills in, surf will likely return to advisory levels Tuesday through midweek as it peaks. A gradual downward trend is then expected through the second half of next week.
A combination of advisory-level surf this weekend and water levels hovering above predicted levels could lead to some wave runup issues, with water sweeping across areas of beaches that typically remain dry. Water levels will steadily lower each day early next week as the next large south swell arrives.
The current small northwest swell will slowly lower through Friday and Saturday before fading on Sunday. A small north swell will likely produce surf near seasonal averages along north-facing shores from late Tuesday or Wednesday into Thursday.
Expect surf along east-facing shores to remain near seasonal averages through early Friday, then gradually decline through early next week as trade winds ease. A slight increase is possible Tuesday and Wednesday due to a combination of rebuilding trade winds and a wrapping north swell.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Friday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Maalaea Bay, Pailolo Channel.

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Data Courtesy of NOAA.gov