West Kaua’i

Tonight: Haze in the evening. Mostly clear with isolated showers. Lows around 73 near the shore to around 65 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Friday: Sunny. Isolated showers in the afternoon. Highs 86 to 93 near the shore to around 79 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Friday Night: Partly cloudy with isolated showers. Lows around 74 near the shore to around 65 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 72 to 77. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Mostly sunny with isolated showers. Highs 79 to 91. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 72 to 77. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers. Lows around 69 in the valleys to around 61 above 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 75 to 83 in the valleys to around 69 above 4000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows around 70 in the valleys to around 62 above 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

North Kaua’i

Tonight: Haze in the evening. Partly cloudy with scattered showers. Lows 65 to 75. East winds up to 15 mph. Chance of rain 50 percent.

Friday: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Highs 73 to 88. East winds up to 15 mph. Chance of rain 40 percent.

Friday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 66 to 75. East winds up to 15 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 68 to 76. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 78 to 86. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 68 to 77. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Locally breezy trade winds will remain through most of the weekend before easing a bit early next week. Fairly typical summertime weather is expected through the week, with showers favoring windward and mauka areas.

Discussion

Dominant high pressure far north of the area will maintain locally breezy east-northeast trade winds through Saturday. By Sunday into early next week the high looks to get disrupted just a little by a front passing far north of the area. This will allow trade winds to weaken a little bit during the beginning of next week. Long range guidance then shows the high re-strengthening and allowing trades to become breezy again during the second half of next week. A ridge aloft will maintain stable conditions that will limit shower intensity and keep windward rainfall totals on most islands less than a quarter of an inch today. Aside from scattered afternoon showers on the Kona slopes, leeward areas will experience little rainfall.
A typical summertime shower distribution can be expected through the week and into next week, with mainly windward and mountain showers with afternoon showers for the Kona slopes. Windward and mountain showers will also have a slight boost during the overnight/early morning hours, with all showers remaining mostly light.

Aviation

Moderate trades will continue through the weekend.. Low ceilings and showers will impact mainly windward and mauka locations. MVFR conditions possible in showers, otherwise VFR.
No AIRMETs in effect.

Marine

As high pressure far north of the islands edges slightly south and east through this weekend and interacts with a couple of lows and troughs passing to the south and southwest of Hawaii, trades will remain fresh to strong. A Small Craft Advisory (SCA) is in effect for the windier channels and waters around Maui County and the Big Island through early Saturday morning. This SCA will likely need to be extended through at least Saturday night before weakening high pressure to the north allows winds to diminish once again into early next week.
A small, long-period west-northwest swell from former Super Typhoon Bavi will maintain similar surf heights along west-facing and north- facing shores tonight before gradually subsiding Friday into the weekend. This swell is overlapping for some west-facing shores with a gradually fading small, medium-period southwest Tasman swell and will continue to produce somewhat below average surf for south-facing shores as both swells fade. North-facing shores return to flat to tiny surf by this weekend with the loss of the west-northwest swell.
Surf returns to near average for south-facing shores late Friday with a reinforcing small, long-period south-southwest swell. This swell then fades through the weekend. Then a moderate, long-period south swell will arrive Sunday and build through early next week, bringing the potential for above-average (though sub-advisory) surf.
Surf along east-facing shores will gradually build up a notch and become choppy as trades strengthen through the weekend. Early to midweek next week, there's potential for a small to moderate, medium-period swell to arrive, generated from Tropical Storm Elida.

HFO Watches/Warnings/Advisories

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

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Data Courtesy of NOAA.gov