West Kaua’i

Rest Of Tonight: Mostly clear 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.

Monday: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Highs 85 to 92 near the shore to around 77 above 3000 feet. North winds up to 10 mph shifting to the west in the afternoon. Chance of rain 40 percent.

Monday Night: Mostly clear with isolated showers. Lows around 75 near the shore to around 65 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

South Kaua’i

Rest Of Tonight: Partly cloudy. Isolated showers early in the evening, then scattered showers after midnight. Lows 70 to 76. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Monday: Mostly sunny in the morning then becoming partly sunny. Breezy. Scattered showers. Highs 79 to 90. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Monday Night: Partly cloudy with isolated showers. Lows 72 to 78. Northeast winds around 15 mph. Chance of rain 20 percent.

Kaua’i Mountains

Rest Of Tonight: Mostly cloudy with scattered showers. Lows around 67 in the valleys to around 60 above 4000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered showers. Highs 74 to 81 in the valleys to around 67 above 4000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy with scattered showers. Lows around 70 in the valleys to around 62 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

North Kaua’i

Rest Of Tonight: Partly cloudy with scattered showers. Lows 64 to 74. East winds up to 15 mph. Chance of rain 40 percent.

Monday: Mostly sunny in the morning then becoming partly sunny. Scattered showers. Highs 71 to 86. East winds up to 15 mph. Chance of rain 40 percent.

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows 66 to 75. East winds up to 15 mph. Chance of rain 50 percent.

East Kaua’i

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

Monday: Partly sunny with scattered showers. Highs 77 to 86. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 68 to 78. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Update

Minor zone forecast update for winds account for new NHC forecast for Hurricane Fausto.

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 on Tuesday and Wednesday as a tropical storm. 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.

Discussion

Trade winds driven by high pressure far northwest of Hawaii will continue through Tuesday. Incoming clouds and showers will primarily impact windward and mauka areas.
East of the state Hurricane Fausto continues to march west northwest. Fausto remains on a high confidence track, keeping the center of the storm and the highest impacts passing north of the state. Additionally, the environment ahead of Fausto grows more unfavorable on approach to the islands and we expect it to weaken into a tropical storm before arrival in the vicinity of the Hawaiian Islands. That said, we remain cautious at this stage that even subtle southern shifts in the track or delayed weakening trends may still produce changes to our island by island impacts. We strongly encourage the public to pay close attention to this passing storm system as weather impacts over the Hawaiian Islands early next week will likely evolve over time.
High confidence Fausto impacts…high surf possibly above warning thresholds for east facing shores from Monday through Tuesday. A High Surf Advisory is already in effect for east facing shores through Wednesday, with the possibility of an upgrade to a warning. Lesser confidence impacts include…strong winds to around 40 mph may develop near and north of the low center and possible heavy rain threats from Tuesday through Wednesday.
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 will continue to persist, but will likely weaken a notch and back towards a more northeasterly direction on Monday. Clouds and showers will continue to ride in with the breezy trades and will produce brief periods of MVFR ceilings at times, especially during the overnight period.
AIRMET Tango remains in effect for mod low-level turb downwind of island terrain. This AIRMET is likely to continue through tonight.

Marine

Fresh to locally strong trades will persist today then gradually shift to the NNE and diminish through the middle of the week in response to Hurricane Fausto passing north of the islands. The trades will then ramp back up to fresh and strong levels late this week into the weekend as Fausto continues off to the west- northwest away from the state while strong high pressure builds north of the islands. A Small Craft Advisory has been extended through Monday afternoon for the windier waters and channels around Maui and the Big Island.
The current long-period south swell will continue to bring moderate to large surf through tonight before slowly declining Monday into Tuesday. The High Surf Advisory has been extended through tonight for all south facing shores.
Currently east facing shores due to the locally strong trade winds will continue to support rough choppy surf. Additionally, nearshore buoys on the eastern side of the islands all have begun to show the long period forerunners of the new easterly swell. This moderate long period energy has promoted the High Surf Advisory for east facing shores through Wednesday afternoon. A Small Craft Advisory may also be needed for seas greater than 10 feet for effected windward waters. Energy from Hurricane Fausto is expected to build and potentially reach High Surf Warning levels by Monday night through early Wednesday. After a brief lull late Wednesday through Thursday, east shore surf will trend back up Friday into the weekend due to a combination of rising trade wind swell and a new long period east swell associated with Tropical Storm Genevieve moving in.
A Coastal Flood statement may be issued during the peak of the large surf for vulnerable low-lying coastal roadways, docks, boat ramps, and other coastal infrastructure exposed to the large east swell too.
Surf along N shores remains flat to tiny today. 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 Monday for Niihau, Kauai Leeward, Waianae Coast, Kahoolawe, Maui Leeward West, Kona, Kauai South, East Honolulu, Honolulu Metro, Ewa Plain, Molokai Leeward South, Lanai Leeward, Lanai South, Maui Central Valley South, South Maui/Upcountry, South Haleakala, Big Island South, Big Island Southeast.
High Surf Advisory until 6 PM HST Wednesday for Olomana, Maui Windward West, Kauai East, Koolau Windward, Molokai Windward, Molokai Southeast, Windward Haleakala, Kipahulu, Big Island East, Big Island North.
Small Craft Advisory until 6 PM HST Monday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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Data Courtesy of NOAA.gov