West Kaua’i

Tonight: Partly cloudy with isolated showers. Lows 69 to 74 near the shore to around 62 above 3000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

Tuesday: Sunny. Highs 85 to 90 near the shore to around 76 above 3000 feet. Northeast winds 10 to 15 mph.

Tuesday Night: Partly cloudy. Lows around 71 near the shore to around 61 above 3000 feet. East winds 10 to 15 mph.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows around 73. Northeast winds around 15 mph. Chance of rain 50 percent.

Tuesday: Mostly sunny with isolated showers. Highs 81 to 89. Northeast winds around 15 mph. Chance of rain 20 percent.

Tuesday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows around 73. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy. Occasional showers in the evening, then scattered showers after midnight. Lows 64 to 70 in the valleys to around 59 above 4000 feet. East winds 10 to 15 mph. Chance of rain 90 percent.

Tuesday: Partly sunny with scattered showers. Highs 75 to 83 in the valleys to around 66 above 4000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Tuesday Night: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows 63 to 69 in the valleys to around 59 above 4000 feet. East winds 10 to 15 mph. Chance of rain 70 percent.

North Kaua’i

Tonight: Mostly cloudy with numerous showers in the evening, then partly cloudy with scattered showers after midnight. Lows 65 to 74. East winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday: Mostly sunny with isolated showers. Highs 77 to 86. East winds 10 to 15 mph. Chance of rain 20 percent.

Tuesday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 65 to 73. East winds 10 to 15 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Mostly cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 65 to 77. East winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 74 to 86. East winds around 15 mph. Chance of rain 50 percent.

Tuesday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 64 to 76. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Breezy trades will persist through Tuesday, ease slightly Wednesday through Friday, then become breezy again during the weekend. Clouds and showers will be focused over windward and mauka areas through the week, especially during the overnight and early morning hours.

Discussion

Stable June weather will persist through the week, with periods of locally breezy trade winds focusing showers over windward and mauka areas. Broad surface high pressure far north of the state will maintain trades near current strength through at least Tuesday. Winds will ease slightly on Wednesday as the high shifts to the northeast, followed by a likely increase again during the weekend as the high moves closer to the state. A mid-level ridge overhead will maintain stable conditions, and pockets of moisture in the trade wind flow will focus showers along windward areas, especially at night. A diffuse band of shallow moisture will pass over the islands late this afternoon through the evening and produce a boost in windward showers, with top sites likely receiving over a half inch of rain. Otherwise, no organized areas of moisture are noted for the next few days. Aside from a few passing showers tonight, leeward areas from Kauai to Maui will be rather dry, and the Kona slopes of the Big Island will continue to experience scattered showers each afternoon. High clouds over the area will dissipate tonight as an upper-level low to the west of Kauai is pushed away by a strengthening ridge aloft.

Aviation

Stable, breezy trades deliver clouds and showers mainly to windward and mauka zones through the period. VFR prevails through today with patchy MVFR possible within any showers. A shower band lingering offshore threatens to bring more widespread MVFR potential tonight.
AIRMET Tango remains in effect for low-level lee turb.
AIRMET Sierra for mountain obscuration may be needed for select windward zones overnight.

Marine

High pressure north of the state will drive trades through the rest of the week. A slight weakening trend in the winds is expected as the high moves eastward. A Small Craft Advisory (SCA) for the windier waters and channels near Maui and the Big Island goes through 6 AM HST Wednesday with a likely extension.
A series of small, long-period, south swells will help boost surf heights along south facing shores though the week. The current south swell will decline through Tuesday followed by another small south swell from Wednesday into Thursday.
Rough and choppy surf along east facing shores will continue this week. Surf will remain nearly flat along north facing shores throughout the forecast period.

HFO Watches/Warnings/Advisories

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

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