West Kaua’i

Tonight: Partly cloudy with isolated showers. Lows 72 to 77 near the shore to around 62 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Saturday: Mostly sunny with isolated showers. Highs around 89 near the shore to around 76 above 3000 feet. East winds around 10 mph. Chance of rain 20 percent.

Saturday Night: Partly cloudy with isolated showers. Lows around 74 near the shore to around 61 above 3000 feet. East winds up to 10 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows around 74. East winds 10 to 15 mph. Chance of rain 40 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 82 to 90. East winds 10 to 15 mph. Chance of rain 50 percent.

Saturday Night: Mostly cloudy with scattered showers. Lows around 73. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers. Lows 67 to 72 in the valleys to around 60 above 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs 75 to 87 in the valleys to 64 to 69 above 4000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Saturday Night: Mostly cloudy with scattered showers. Lows 66 to 72 in the valleys to around 59 above 4000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 67 to 75. East winds up to 15 mph. Chance of rain 40 percent.

Saturday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 80 to 89. East winds 10 to 15 mph. Chance of rain 40 percent.

Saturday Night: Partly cloudy with isolated showers. Lows 66 to 74. East winds 10 to 15 mph decreasing to up to 15 mph after midnight. Chance of rain 20 percent.

East Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 67 to 79. East winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 76 to 87. East winds 10 to 15 mph. Chance of rain 50 percent.

Saturday Night: Mostly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 67 to 78. East winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

High pressure centered northeast of Hawaii will drive moderate to fresh trade winds with dry and stable weather into next week. An upper trough will drift through the islands from Tuesday to Thursday possibly increasing showers.

Discussion

High pressure centered northeast of Hawaii will drive moderate to fresh trade winds with dry and stable weather into next week. Visible satellite and radar show a few clouds and showers across leeward Kauai as the last bit of moisture that moved in yesterday clears the western end of the state. Scattered cirrus clouds wrapping around an upper ridge will likely continue across the area through at least Saturday. The overall pattern will change little through Monday, with the best chance for rainfall and cloud cover over the windward slopes, but accumulations will be light.
A tropical wave will pass south of the state Tuesday through Thursday. Upper level troughing will set up over the state around the same time may act to enhance showers moving in on both the trade wind flow and the far northern periphery of the wave. Clouds and showers will likely increase during this time frame focusing over windward and mauka areas.

Aviation

Moderate to locally breezy trade winds will hold for the next few days as high pressure to the northeast remains in place. Showers will favor windward and mountain areas as well as the night time and early morning hours. MVFR conditions can be expected in any showers but overall VFR conditions are expected.
No AIRMETs are in effect. AIRMET Sierra for mountain obscuration over select windward areas is possible tonight.

Marine

High pressure will remain in place far northeast of state through the weekend, allowing moderate to locally strong trade winds to prevail across the coastal waters. A Small Craft Advisory remains in effect for the typically windy channels and waters of Maui County and the Big Island through early Sunday. Winds may briefly weaken slightly late Sunday into early next week, then strengthen back to Small Craft Advisory levels once again by midweek.
Surf along south facing shores will remain near or slightly above the September average for the next couple of days. The current small, medium-period south swell will gradually decline through Saturday, but a smaller long-period reinforcement on Sunday will maintain small south shore surf into next week.
A small north northwest swell is currently moving through the region and producing elevated surf along north facing shores. Webcams today have shown sets that appear to have slightly outperformed in some spots what one would expect based on buoy observations. As a result, surf heights for north facing shores have been adjusted slightly higher through this evening, but expect them to gradually decline through late Saturday as this swell wanes. Another short- to medium-period north northwest reinforcement could cause a slight bump in surf along north facing shores on Sunday, then decline through midweek.
East facing shores will see typical trade wind generated energy throughout the forecast period.

HFO Watches/Warnings/Advisories

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

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