Weather Forecast

Hawaii County Weather Forecast for August 28, 2021

August 28, 2021, 7:16 AM HST
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Hilo

Today: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy with showers likely. Lows 63 to 71 near the shore to around 56 at 4000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 70 percent.

Sunday: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Kona

Today: Mostly sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs 82 to 87 near the shore to around 69 near 5000 feet. West winds up to 10 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy after midnight. Lows 69 to 74 near the shore to 50 to 56 near 5000 feet. North winds up to 10 mph. Chance of rain 40 percent.

ARTICLE CONTINUES BELOW AD

Sunday: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 82 to 87 near the shore to around 69 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

ARTICLE CONTINUES BELOW AD

Today: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 63 to 70 near the shore to 56 to 62 near 3000 feet. East winds around 10 mph. Chance of rain 50 percent.

Sunday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds around 10 mph. Chance of rain 50 percent.

Kohala

ARTICLE CONTINUES BELOW AD

Today: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 63 to 70 near the shore to 56 to 62 near 3000 feet. East winds around 10 mph. Chance of rain 50 percent.

Sunday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds around 10 mph. Chance of rain 50 percent.

South Big Island

Today: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 86 near the shore to around 73 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Lows around 72 near the shore to around 53 near 5000 feet. East winds 10 to 15 mph.

Sunday: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 86 near the shore to around 73 near 5000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Puna

Today: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy with showers likely. Lows 63 to 71 near the shore to around 56 at 4000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 70 percent.

Sunday: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Waikoloa

Today: Mostly sunny. Isolated showers in the afternoon. Highs around 86 near the shore to 70 to 76 above 4000 feet. Northwest winds up to 15 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated showers in the evening. Lows around 73 near the shore to 50 to 56 above 4000 feet. Light winds. Chance of rain 20 percent.

Sunday: Mostly sunny. Isolated showers in the afternoon. Highs around 86 near the shore to 70 to 76 above 4000 feet. Light winds. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Moderate to locally breezy trades will begin decreasing today, leading to reduced windward shower coverage and the potential for sea breezes and more interior clouds by early next week.

Discussion

There is little to no change in forecast philosophy from last evening. An upper low northeast of the main Hawaiian Islands will slowly meander west-southwestward through early next week. Induced surface troughing beneath the upper low will drift west southwest with the upper feature over the next few days. Rather dry and stable air persists over the islands this morning and windward shower coverage will be on the decline today.
As the surface trough approaches the islands, trade winds will decrease, allowing development of local land and sea breezes. For Sunday through Tuesday, expect a modified sea breeze regime, with afternoon clouds and a few showers over the most sheltered locales. If trade flow weakens more than forecast, a pure sea breeze pattern may manifest Monday and/or Tuesday, leading to greater afternoon and evening coverage of inland clouds and showers. Models show the possibility of increased instability over the western end of the state by the middle of next week as colder air moves in aloft.

Aviation

High pressure far north of the islands will sustain mainly moderate trade winds across the region through much of the day, with a weakening in the trade flow beginning later today into tonight. Most of the lower cloudiness and showers riding on the trades will affect windward and mauka sections across the state from time to time, but conditions overall will be VFR.
No AIRMETs are currently in effect, and none are anticipated in the immediate future.

Marine

A high pressure ridge far north of the Hawaiian Islands will keep the region in a moderate trade wind pattern today. An upper level disturbance continues to move in north of the islands. A developing surface trough under this upper level system will produce light winds across the region later this evening into Wednesday. Light background easterly winds will prevail with local scale land and sea breezes near the islands.
A new small south swell will build today, peaking later this afternoon, then lower slowly into early next week. Background southerly swells will then produce smaller surf through much of this week.
Surf will continue to diminish along east facing shores as the trade winds weaken through Wednesday. Surf along east facing shores will gradually increase later this week as trade winds strengthen. No other significant swells are expected.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov

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