West Kaua’i

Rest Of Tonight: Mostly cloudy early in the evening then becoming partly cloudy. Breezy. Isolated showers. Lows around 69 near the shore to around 59 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Monday: Breezy. Mostly sunny with isolated showers. Highs 82 to 89 near the shore to around 75 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Monday Night: Mostly clear. Breezy. Isolated showers in the evening. Lows 67 to 72 near the shore to around 60 above 3000 feet. Northeast winds up to 20 mph decreasing to up to 10 mph after midnight. Chance of rain 20 percent.

South Kaua’i

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 70. Northeast winds 15 to 20 mph. Chance of rain 50 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 79 to 87. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Monday Night: Breezy. Mostly cloudy with scattered showers. Lows around 70. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Kaua’i Mountains

Rest Of Tonight: Mostly cloudy. Breezy. Numerous showers early in the evening, then scattered showers after midnight. Lows 61 to 68 in the valleys to around 57 above 4000 feet. East winds up to 25 mph. Chance of rain 70 percent.

Monday: Mostly cloudy. Breezy. Numerous showers in the morning, then frequent showers in the afternoon. Highs 73 to 80 in the valleys to around 64 above 4000 feet. East winds up to 20 mph. Chance of rain 90 percent.

Monday Night: Mostly cloudy. Breezy. Numerous showers in the evening, then scattered showers after midnight. Lows 62 to 69 in the valleys to around 58 above 4000 feet. East winds up to 20 mph. Chance of rain 70 percent.

North Kaua’i

Rest Of Tonight: Mostly cloudy. Numerous showers early in the evening, then scattered showers after midnight. Lows 63 to 71. East winds up to 15 mph. Chance of rain 70 percent.

Monday: Partly sunny. Breezy. Scattered showers in the morning, then numerous showers in the afternoon. Highs 75 to 84. East winds up to 20 mph. Chance of rain 70 percent.

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows 63 to 71. East winds up to 15 mph. Chance of rain 50 percent.

East Kaua’i

Rest Of Tonight: Mostly cloudy. Numerous showers early in the evening, then scattered showers after midnight. Lows 63 to 74. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Monday: Mostly cloudy with scattered showers. Highs 72 to 83. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 64 to 74. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

High pressure far the northeast will drive breezy trade winds with mainly windward and mauka showers. An upper low moving across the state could increase shower coverage and intensity Thursday through next weekend

Discussion

High pressure far northeast of Hawaii will drive breezy trade winds through the next week, with slight variations through the week. Cumulus clouds and scattered showers will move across the state pushed along by the trades, focusing mostly over windward and mauka sides of the islands. Isolated showers will pass over leeward areas of the smaller islands at times, but will not linger long. Most showers will fall during the overnight and early morning time frames, except for Big Island which will receive most of the showers during the afternoon. Overall rainfall amounts will be insignificant through midweek. An upper low moving across the state could increase shower coverage and intensity Thursday through next weekend, with a similar distribution across mostly the windward and mauka areas.

Aviation

VFR prevails with isolated MVFR as breezy trades deliver clouds and showers to windward and mauka areas. Shower coverage then increases tonight for windward portions of Maui through Oahu potentially warranting AIRMET Sierra for mountain obscuration overnight.
AIRMET Tango for lee turb remains in effect.

Marine

Fresh to locally strong trade winds will continue as an area of high pressure remains far north of the state through the next couple of days. A Small Craft Advisory (SCA) remains in effect for most Hawaiian waters as a result, through late Monday afternoon. The high is expected to slowly drift the east, which will allow the trades to weaken slightly Tuesday through mid-week. As that happens, expect the SCA to be scaled back to the more typical waters near Maui and the Big Island through the remainder of the week.
The current long period south-southwest swell continue to keep surf elevated today just below advisory levels. Surf is expected to begin a slow decline over the next few hours that will continue through mid-week.
Surf along east-facing shores will be rough and choppy today due to the stronger trade winds. Rough and choppy surf will persist throughout the week with a slight decrease in surf heights as the trades ease slightly by mid-week.
A series of small northwest swells will keep small surf in place along north facing shores through next weekend.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Monday for Kauai Northwest Waters, Kauai Leeward Waters, Kauai Channel, Oahu Windward Waters, Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Maui County Leeward Waters, Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Kauai Now Weather is brought to you by Blue Hawaiian Helicopters.