Photo Credit: James Grenz

Hilo

Today: Partly sunny with scattered showers. Highs around 83 near the shore to 68 to 73 at 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 67 near the shore to around 53 at 4000 feet. East winds up to 15 mph shifting to the west after midnight. Chance of rain 50 percent.

Juneteenth: Partly sunny with scattered showers. Highs around 83 near the shore to 68 to 73 at 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Kona

Today: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 81 to 86 near the shore to around 68 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 20 percent.

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows 68 to 74 near the shore to around 54 near 5000 feet. Light winds. Chance of rain 40 percent.

Juneteenth: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 81 to 86 near the shore to around 68 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 20 percent.

Waimea

Today: Partly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 81 near the shore to 68 to 78 near 3000 feet. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 40 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 67 near the shore to 55 to 61 near 3000 feet. East winds up to 25 mph decreasing to up to 15 mph after midnight. Chance of rain 50 percent.

Juneteenth: Breezy. Mostly sunny with scattered showers in the morning, then partly sunny with isolated showers in the afternoon. Highs around 81 near the shore to 68 to 78 near 3000 feet. East winds up to 20 mph. Chance of rain 40 percent.

Kohala

Today: Partly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 81 near the shore to 68 to 78 near 3000 feet. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 40 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 67 near the shore to 55 to 61 near 3000 feet. East winds up to 25 mph decreasing to up to 15 mph after midnight. Chance of rain 50 percent.

Juneteenth: Breezy. Mostly sunny with scattered showers in the morning, then partly sunny with isolated showers in the afternoon. Highs around 81 near the shore to 68 to 78 near 3000 feet. East winds up to 20 mph. Chance of rain 40 percent.

South Big Island

Today: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 85 near the shore to around 72 near 5000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Lows around 69 near the shore to around 52 near 5000 feet. Northeast winds 10 to 25 mph. Chance of rain 20 percent.

Juneteenth: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 85 near the shore to around 72 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Puna

Today: Partly sunny with scattered showers. Highs around 83 near the shore to 68 to 73 at 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 67 near the shore to around 53 at 4000 feet. East winds up to 15 mph shifting to the west after midnight. Chance of rain 50 percent.

Juneteenth: Partly sunny with scattered showers. Highs around 83 near the shore to 68 to 73 at 4000 feet. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Waikoloa

Today: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 85 near the shore to 69 to 75 above 4000 feet. North winds up to 15 mph. Chance of rain 20 percent.

Tonight: Partly cloudy with isolated showers. Lows 69 to 74 near the shore to 50 to 57 above 4000 feet. Southeast winds up to 15 mph. Chance of rain 20 percent.

Juneteenth: Mostly sunny. Isolated showers in the afternoon. Highs around 85 near the shore to 69 to 75 above 4000 feet. North winds up to 15 mph. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Moderate to locally breezy trade winds will continue through the next 7 days. Very typical late spring and early summer weather will prevail, with bands of showery low clouds moving through the islands at times. Showers will be most prevalent in windward areas, particularly at night and during the early morning hours, with a few showers reaching leeward areas from time to time.

Discussion

Currently at the surface, a 1029 mb high is centered around 1250 miles north-northeast of Honolulu, and is driving moderate trade winds across the island chain early this morning. Infrared satellite imagery shows mostly cloudy conditions over much of the Big Island and windward sections of the smaller islands, with partly cloudy skies in most leeward areas of the smaller islands. Radar imagery shows scattered to numerous showers moving into windward areas, with coverage the greatest over Maui and the Big Island, while very little shower activity is noted in leeward areas. Main short term focus revolves around rain chances and trade wind trends.
High pressure north-northeast of the state will build eastward and strengthen during the next several days as a weak front edges closer to the islands before stalling out around 600-700 miles northwest of Kauai early next week. This front will then gradually dissipate during the middle to latter part of next week as a new high builds eastward well to the north of the state. Moderate to at times locally breezy trade winds will prevail through the next 7 days with only minor fluctuations in strength.
As for the remaining weather details, very typical late spring / early summer weather will prevail, with bands of showery low clouds moving through the islands at times. Showers will be most prevalent in windward areas, particularly at night and during the early morning hours, with a few showers reaching leeward areas from time to time.

Aviation

Moderate to locally breezy trade winds will continue to push patches of low clouds over the islands from the east, leading to periods of MVFR VIS/CIG over windward areas. AIRMET Sierra for mountain obscuration remains in place for the Big Island as well as for Maui, Molokai and Oahu. Expect conditions to improve along windward Big Island later today, while the rest of the state experiences continued windward clouds and SHRA. An upper low north of Kauai will continue to slightly destabilize the atmosphere and support a few heavy showers.

Marine

Moderate to locally strong trade winds will persist as high pressure remains anchored far northeast of the area. The Small Craft Advisory has been extended for the typically windier zones around Maui County and Big Island through tomorrow afternoon.
Expect small surf along north and west facing shores through mid week next week as the current northwest swell moves through the island chain and another slightly larger, northwest swell fills in late tonight into Sunday, before slowly subsiding Monday into Tuesday. The new long- period south- southwest swell will continue to fill in today, and peak late tonight into tomorrow. This swell will generate near average surf along south, and to a lesser extent west facing shores. A long period, south swell is anticipated to fill in late Monday, peak late Tuesday, then slowly subside into the second half of next week. This swell is expected to bring above average surf for south facing shores. Moderate to fresh trades will continue to generate rough, choppy surf along east facing shores.

HFO Watches/Warnings/Advisories

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

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Data Courtesy of NOAA.gov