West Kaua’i

Tonight: Partly cloudy. Isolated showers in the evening. Lows 65 to 70 near the shore to around 58 above 3000 feet. Light winds. Chance of rain 20 percent.

Thursday: Sunny. Isolated showers in the afternoon. Highs 79 to 87 near the shore to around 72 above 3000 feet. Northeast winds up to 10 mph shifting to the southeast in the afternoon. Chance of rain 20 percent.

Thursday Night: Mostly clear. Lows around 67 near the shore to around 58 above 3000 feet. Light winds.

South Kaua’i

Tonight: Partly cloudy. Isolated showers in the evening. Lows around 69. Northeast winds around 10 mph. Chance of rain 20 percent.

Thursday: Mostly sunny with isolated showers. Highs 79 to 86. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Thursday Night: Partly cloudy with isolated showers. Lows around 68. Light winds. Chance of rain 20 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 58 to 68 in the valleys to around 57 above 4000 feet. Light winds. Chance of rain 40 percent.

Thursday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 74 to 80 in the valleys to around 65 above 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Thursday Night: Partly cloudy with isolated showers. Lows 57 to 67 in the valleys to around 56 above 4000 feet. East winds up to 10 mph. Chance of rain 20 percent.

North Kaua’i

Tonight: Partly cloudy with isolated showers. Lows 61 to 69. Light winds. Chance of rain 20 percent.

Thursday: Mostly sunny with isolated showers. Highs 75 to 82. Southeast winds up to 10 mph. Chance of rain 20 percent.

Thursday Night: Partly cloudy with isolated showers. Lows 61 to 69. Southeast winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

East Kaua’i

Tonight: Partly cloudy with isolated showers. Lows 62 to 72. Light winds. Chance of rain 20 percent.

Thursday: Mostly sunny with isolated showers. Highs 72 to 84. North winds up to 10 mph shifting to the east around 10 mph in the afternoon. Chance of rain 20 percent.

Thursday Night: Partly cloudy with isolated showers. Lows 61 to 71. East winds around 10 mph in the evening becoming light. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Light winds and dry weather prevail for the next week bringing a prolonged stretch of benign weather.

Discussion

A strong Pacific jet extends across the north central Pacific in maintenance of expansive ridging established to south. The trade wind belt remains suppressed mostly south of the state with a surface ridge axis in place north of Kauai. This pattern supports moderate trades over the eastern end of the state decreasing to light trades over the western end where afternoon sea breezes and overnight land breezes will be common. Active mid-level subsidence, light winds, and no apparent upstream moisture source favor dry and benign weather through the forecast period.

Aviation

A ridge north of the islands will support SE winds over Kauai and Oahu, and light to moderate E winds over Maui and Hawaii Counties. Low cigs and SHRA should favor windward and mauka locations with periods of MVFR conds. In addition, land/sea breezes will be likely over leeward areas and interior areas with VFR conds will prevail.
No AIRMETs are in effect and none are anticipated.

Marine

moderate to locally fresh easterly trade winds in the forecast. The ridge will weaken from Thursday into Friday as a shallow cold front approaches the islands from the northwest. A Small Craft Advisory (SCA) for winds around Big Island and Maui County through Thursday morning, this advisory will likely be extended through Thursday afternoon.
A large west-northwest swell peaked will decline this evening, as another west northwest swell builds in by Thursday morning pushing surf heights back up over advisory levels for exposed north and west facing shores. A High Surf Advisory (HSA) remains in effect along exposed north and west facing shores of Niihau, Kauai, Oahu, Molokai and the west facing shores of the Big Island. This advisory will likely remain in place, briefly expanding into north Maui, through Thursday night.
Small surf is expected along east facing shores this week as winds remain light. Surf along south facing shores should see a small boost today as a small south swell fills in through the end of the week.

HFO Watches/Warnings/Advisories

High Surf Advisory until 6 PM HST Thursday for Niihau, Kauai Leeward, Waianae Coast, Oahu North Shore, Kona, Kohala, Kauai North, Molokai Windward, Molokai North, Molokai West, Big Island South.
Small Craft Advisory until 10 AM HST Thursday for Maui County Windward Waters, Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Windward Waters, Big Island Leeward Waters.

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