Hilo

Tonight: Mostly cloudy with isolated showers. Lows 58 to 67 near the shore to 48 to 53 at 4000 feet. South winds up to 10 mph shifting to the southwest after midnight. Chance of rain 20 percent.

Sunday: Mostly cloudy with isolated showers. Highs 76 to 81 near the shore to around 65 at 4000 feet. Southwest winds up to 10 mph shifting to the east in the afternoon. Gusts up to 30 mph. Chance of rain 20 percent.

Sunday Night: Mostly cloudy with scattered showers. Lows 59 to 68 near the shore to 49 to 55 at 4000 feet. Southeast winds up to 10 mph. Gusts up to 30 mph. Chance of rain 40 percent.

Kona

Tonight: Mostly cloudy. Isolated showers in the evening. Lows 67 to 73 near the shore to 46 to 51 near 5000 feet. North winds up to 10 mph. Chance of rain 20 percent.

Sunday: Partly sunny in the morning, then cloudy with isolated showers in the afternoon. Highs around 83 near the shore to around 64 near 5000 feet. West winds up to 10 mph in the morning becoming light. Chance of rain 20 percent.

Sunday Night: Cloudy. Lows around 70 near the shore to 47 to 52 near 5000 feet. North winds up to 10 mph.

Waimea

Tonight: Mostly cloudy with isolated showers. Lows 59 to 68 near the shore to 51 to 59 near 3000 feet. Light winds. Chance of rain 20 percent.

Sunday: Breezy. Mostly cloudy with isolated showers. Highs around 78 near the shore to 68 to 75 near 3000 feet. East winds up to 20 mph. Gusts up to 45 mph in the afternoon. Chance of rain 20 percent.

Sunday Night: Cloudy. Lows 60 to 69 near the shore to 52 to 60 near 3000 feet. East winds up to 15 mph.

Kohala

Tonight: Mostly cloudy with isolated showers. Lows 59 to 68 near the shore to 51 to 59 near 3000 feet. Light winds. Chance of rain 20 percent.

Sunday: Breezy. Mostly cloudy with isolated showers. Highs around 78 near the shore to 68 to 75 near 3000 feet. East winds up to 20 mph. Gusts up to 45 mph in the afternoon. Chance of rain 20 percent.

Sunday Night: Cloudy. Lows 60 to 69 near the shore to 52 to 60 near 3000 feet. East winds up to 15 mph.

South Big Island

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Lows around 71 near the shore to around 52 near 5000 feet. Northeast winds up to 20 mph.

Sunday: Partly sunny. Breezy. Isolated showers in the afternoon. Highs around 82 near the shore to around 64 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Sunday Night: Cloudy and breezy. Lows around 72 near the shore to around 53 near 5000 feet. East winds 10 to 25 mph.

Puna

Tonight: Mostly cloudy with isolated showers. Lows 58 to 67 near the shore to 48 to 53 at 4000 feet. South winds up to 10 mph shifting to the southwest after midnight. Chance of rain 20 percent.

Sunday: Mostly cloudy with isolated showers. Highs 76 to 81 near the shore to around 65 at 4000 feet. Southwest winds up to 10 mph shifting to the east in the afternoon. Gusts up to 30 mph. Chance of rain 20 percent.

Sunday Night: Mostly cloudy with scattered showers. Lows 59 to 68 near the shore to 49 to 55 at 4000 feet. Southeast winds up to 10 mph. Gusts up to 30 mph. Chance of rain 40 percent.

Waikoloa

Tonight: Mostly cloudy. Isolated showers in the evening. Lows 67 to 73 near the shore to 48 to 53 above 4000 feet. Light winds. Chance of rain 20 percent.

Sunday: Mostly cloudy. Isolated showers in the afternoon. Highs around 82 near the shore to 62 to 69 above 4000 feet. East winds up to 10 mph shifting to the northwest in the afternoon. Chance of rain 20 percent.

Sunday Night: Cloudy. Lows 68 to 73 near the shore to 49 to 54 above 4000 feet. West winds up to 10 mph shifting to the southeast after midnight.

Detailed Forecast

Synopsis

Land and sea breeze pattern with interior clouds and a few isolated showers continues into Monday. Breezy easterly trades then return by mid-week supporting benign weather through next week.

Discussion

Loss of diurnal instability and emerging land breezes will bring clearing to Kauai and Oahu as the evening progresses. Lingering moisture and the resident light gradient suggest potential for a few more interior showers over Kauai during Sunday afternoon, but conditions otherwise remain stable and relatively dry. Light SE to ESE winds give way to expanding sea breezes each afternoon through at least Monday followed by returning trades as longwave ridging amplifies over the N central Pacific mid/late next week. Benign weather continues through the extended as high pressure governs breezy trades at the surface and any troughing late next week is modeled to establish well west of the islands.

Aviation

A SE wind regime has allowed showers to move in from the south, and sea breezes to develop in areas sheltered from SE winds. Showers have primarily affected Oahu and Kauai, and will likely linger through the evening. Light winds are expected to continue tomorrow, allowing afternoon seabreezes and island interior showers to be possible. MVFR conditions will occur within showers, and VFR will prevail elsewhere.
AIRMET Sierra is in effect for Kauai and Oahu for portions affected by CLD and SHRA. These conditions are likely to improve overnight as showers move offshore and dissipate.

Marine

An approaching front will keep a surface ridge near Kauai into Sunday, leading to gentle to moderate southeast to south winds across most waters and locally fresh east to southeast winds around Big Island. The ridge will retreat northward late Sunday and Monday, allowing east to southeast winds to develop across the island chain. Easterly trade winds will strengthen Tuesday and Wednesday as broad high pressure builds to the north, and a Small Craft Advisory (SCA) will likely be needed for the typical windy waters around Maui county and the Big Island. SCA conditions may expand to additional waters Thursday as high pressure to the north strengthens.
Small north-northeast and west-northwest swells will continue to gradually lower this weekend. Another west-northwest (330-340 degrees) swell will arrive on Sunday and shift out of the northwest during its peak on Monday, producing surf near the High Surf Advisory level along north facing shores. A larger pulse of overlapping long period north-northwest swell will build Monday night and will likely push surf above the advisory level Tuesday. Resulting seas may reach the 10 foot SCA across exposed waters during the peak of the swell. This swell will gradually decline through the remainder of the week, followed by a small to moderate northwest swell on Friday.
Small surf will prevail along east facing shores through Monday due to a mix of declining north-northeast swell and small wind wave energy generated by trade winds east of the islands. A slight increase in choppy east shore surf is expected by Tuesday as trade winds rebuild. Surf along south facing shores will remain tiny to small through the week.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov