West Kaua’i

Tonight: Breezy. Partly cloudy with isolated showers. Lows around 72 near the shore to around 63 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Sunday: Breezy. Mostly sunny with isolated showers. Highs 84 to 91 near the shore to around 76 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Sunday Night: Partly cloudy with isolated showers. Lows around 72 near the shore to around 63 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 71 to 76. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Sunday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 79 to 89. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Sunday Night: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows 70 to 76. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Kaua’i Mountains

Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows around 68 in the valleys to around 60 above 4000 feet. East winds up to 20 mph. Chance of rain 70 percent.

Sunday: Breezy. Partly sunny with scattered showers. Highs 73 to 81 in the valleys to around 66 above 4000 feet. East winds up to 20 mph. Chance of rain 50 percent.

Sunday Night: Breezy. Mostly cloudy with scattered showers. Lows around 67 in the valleys to around 60 above 4000 feet. East winds up to 20 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 64 to 74. East winds up to 20 mph. Chance of rain 50 percent.

Sunday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 71 to 86. East winds up to 20 mph. Chance of rain 50 percent.

Sunday Night: Breezy. Partly cloudy with scattered showers. Lows 64 to 74. East winds up to 20 mph. Chance of rain 40 percent.

East Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 67 to 75. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Sunday: Breezy. Partly sunny with scattered showers. Highs 76 to 85. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Sunday Night: Mostly cloudy with scattered showers. Lows 67 to 75. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

A strong high pressure system far north of the Hawaiian Islands will continue to produce moderate to breezy trade winds through Monday with periods of showers favoring windward mountain areas in the overnight to early morning hours. Hurricane Fausto remains on track to pass near the Hawaiian Islands early next week. The latest forecast for Fausto shows a weakening trend to tropical storm strength as it moves closer to the island chain. A drier and breezy trade wind weather pattern will return across the state from Thursday onward as Fausto drifts westward away from the Hawaiian Islands.

Short term update

Satellite imagery this evening shows several bands of unsettled clouds riding in on the trade winds. Afternoon subsidence inversion heights as measured by Expect periods of showers favoring the eastern or windward mountain areas in the overnight to early morning hours as these bands pass through the island chain.
The afternoon forecast grids remain in good shape, no evening updates.

Previous discussion

Issued at 341 PM HST Sat Jul 25 2026 Breezy trade winds will usher in windward clouds and showers through Monday. Incoming clouds and showers will focus over windward and mauka areas, mostly occurring during the nighttime and early morning hours. 00Z soundings show a stable environment across the islands with an inversion around 8000 to 9000 feet.
The highlight next week will be the approach of now Hurricane Fausto. Fausto is expected to weaken over the next several days as it tracks west across higher shear and cooler waters, reaching the vicinity of the Hawaiian Islands on Tuesday. Main impacts Tuesday and Wednesday include the possibility of strong winds, flooding rain and east shores surf, and will be dependent upon Fausto's eventual path. Winds could also be mitigated on a more northerly swing of the track, but more impactful if it slides southward, so confidence remains low. For rainfall, mitigating effects will be Fausto's relatively quick west movement limiting how long it will rain will last across each island, but our terrain can capture much of this moisture as it passes through. Meanwhile, swell generated by Fausto has the highest likelihood of occurrence, which will gradually build Sunday night through Monday night.
No time like the present to review your family hurricane preparedness plans, and ensure every household has at least a 14 day supply of food and water available if needed during this years active hurricane season.
A drier and more stable breezy trade wind pattern will fill in across the state from Thursday onward as Fausto continues to journey westward away from the Hawaiian Islands.

Aviation

Breezy trades through the rest of the weekend. Winds should trend down Sunday evening. Low cigs and SHRA should primarily impact windward and mauka locations with some limited spillover to leeward areas. MVFR conds likely in heavier SHRA, otherwise VFR prevails.
AIRMET Sierra remains in effect for mtn obsc for windward portions of Kauai, Oahu, Molokai, Maui and the Big Island. Conds should improve in the early morning hours.
AIRMET Tango remains in effect for mod low- level turb downwind of island terrain. This AIRMET is likely to continue through Sunday.

Marine

Fresh to locally strong trades will persist through Sunday then gradually shift to the NNE and diminish through the middle of next week in response to Hurricane Fausto passing north of the islands. The trades will then ramp back up to fresh and strong levels late next week into next weekend as Fausto continues off to the west-northwest away from the state while strong high pressure builds back into the north of the islands. A Small Craft Advisory remains in effect for the windier waters around Maui and the Big Island through 6 PM Sunday.
The current long-period south swell will hold steady at advisory levels tonight, then begin a slow decline Sunday through late next week. Depending on observational trends from the buoys south of the islands, the advisory may need to be extended through the day Sunday. South shore surf will remain elevated above the summertime average through the middle of next week, before trending closer to or perhaps a bit below normal by next weekend.
Locally strong trade winds will continue to support rough surf above the seasonal average along east facing shores tonight and Sunday. Trade wind swell will then decline due to diminishing trades Sunday night through the middle of next week. A long period swell from Hurricane Fausto will begin to arrive later tonight, build Sunday and Monday, then peak Tuesday into early Wednesday. This swell is forecast to produce advisory level surf along east facing shores as early as Monday, followed by potential for warning level surf as it peaks on Tuesday into early Wednesday. After a brief lull late Wednesday through Thursday, east shore surf will trend back up Friday into next weekend due to a combination of rising trade wind swell and a new long period east swell associated with Tropical Storm Genevieve moving in.
Surf along N shores remains flat to tiny through the weekend. Some increase is expected as Fausto or its remnants pass near the region Tuesday and Wednesday, with north shore surf returning to typical flat to tiny levels late Wednesday into next weekend.

HFO Watches/Warnings/Advisories

High Surf Advisory until 6 AM HST Sunday for all south facing shores.
Small Craft Advisory until 6 PM HST Sunday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Maalaea Bay, Pailolo Channel.

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Data Courtesy of NOAA.gov