West Kaua’i

Tonight: Mostly clear. Isolated showers after midnight. Lows 69 to 74 near the shore to around 62 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Monday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 84 to 90 near the shore to around 76 above 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

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

South Kaua’i

Tonight: 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 40 percent.

Monday: Breezy. Partly sunny with scattered showers. Highs 81 to 89. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

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

Kaua’i Mountains

Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows 64 to 69 in the valleys to around 59 above 4000 feet. East winds 10 to 20 mph decreasing to up to 20 mph after midnight. Chance of rain 70 percent.

Monday: Mostly cloudy. Breezy. Occasional showers in the morning, then numerous showers in the afternoon. Highs 75 to 83 in the valleys to around 66 above 4000 feet. East winds 10 to 20 mph. Chance of rain 80 percent.

Monday Night: Mostly cloudy. Numerous 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 70 percent.

North Kaua’i

Tonight: Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 64 to 74. East winds up to 15 mph. Chance of rain 40 percent.

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

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows 65 to 74. East winds 10 to 15 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 65 to 76. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Monday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 73 to 86. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 65 to 77. East winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Breezy trades will focus clouds and showers over windward and mauka areas through the week, especially during the overnight and early morning hours.

Discussion

Typical June weather will persist through the week, with 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 Wednesday, followed by a slight decrease in winds on Thursday as the high shifts to the northeast. A mid-level ridge overhead will maintain stable conditions, and little organized moisture is forecast to be moving along the trade wind flow. As a result, expect showers to be focused along windward areas, especially at night, with rainfall accumulations of less than a half of an inch per day at most sites. Leeward areas will continue to be rather dry, except for scattered afternoon showers along the Kona slopes of the Big Island. Thin high clouds will pass over the islands into Monday, then dissipate as an upper-level low west of the state drifts away.

Aviation

Stable, breezy trades deliver clouds and showers mainly to windward and mauka zones through the period. VFR prevails, but MVFR will be possible within any showers.
AIRMET Tango remains in effect for low-level lee turb.

Marine

High pressure north of Hawaii will drive trade winds through the week, with a slight weakening trend as the high moves away eastward. A Small Craft Advisory (SCA) for the windier waters and channels near Maui and the Big Island goes through Monday night, likely extending beyond this point.
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 over the next couple days followed by another 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 Tuesday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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