Hilo

Today: Partly sunny with scattered showers. Highs around 80 near the shore to 64 to 69 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 64 to 69 near the shore to around 51 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs around 80 near the shore to 64 to 69 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Kona

Today: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs 79 to 84 near the shore to around 64 near 5000 feet. West winds up to 10 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Lows 68 to 73 near the shore to around 52 near 5000 feet. Light winds.

Saturday: Sunny. Highs 79 to 84 near the shore to around 64 near 5000 feet. Light winds.

Waimea

Today: Mostly sunny in the morning then becoming partly sunny. Breezy. Scattered showers. Highs around 79 near the shore to 64 to 74 near 3000 feet. East winds up to 20 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 66 near the shore to 52 to 59 near 3000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs around 79 near the shore to 64 to 74 near 3000 feet. East winds up to 10 mph in the morning becoming light. Chance of rain 50 percent.

Kohala

Today: Mostly sunny in the morning then becoming partly sunny. Breezy. Scattered showers. Highs around 79 near the shore to 64 to 74 near 3000 feet. East winds up to 20 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 66 near the shore to 52 to 59 near 3000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs around 79 near the shore to 64 to 74 near 3000 feet. East winds up to 10 mph in the morning becoming light. Chance of rain 50 percent.

South Big Island

Today: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 82 near the shore to around 68 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Lows 65 to 72 near the shore to around 51 near 5000 feet. Northeast winds 10 to 15 mph decreasing to up to 10 mph after midnight.

Saturday: Sunny. Highs around 82 near the shore to around 68 near 5000 feet. East winds up to 10 mph.

Puna

Today: Partly sunny with scattered showers. Highs around 80 near the shore to 64 to 69 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 64 to 69 near the shore to around 51 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs around 80 near the shore to 64 to 69 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Waikoloa

Today: Mostly sunny. Highs around 83 near the shore to 65 to 71 above 4000 feet. Northeast winds up to 15 mph.

Tonight: Partly cloudy. Lows 67 to 73 near the shore to 48 to 55 above 4000 feet. Light winds.

Saturday: Sunny. Highs around 83 near the shore to 65 to 71 above 4000 feet. Light winds.

Synopsis

A breezy trades will briefly weaken over the weekend, before increasing again early in the new week. Mostly dry conditions will prevail, with clouds and brief showers favoring windward and mauka locations, mainly during the overnight through early morning hours, as areas of moisture move through periodically.

Discussion

No changes to the forecast this morning, however the Big Island summit winds are near Wind Advisory criteria so keeping a close eye on the winds there. Winds will hover near the advisory criteria into Saturday before trending downward.
High pressure far to the north-northwest of the state will drift to the east, with a ridge of high pressure remaining north of the region. This will maintain a trade wind pattern into the middle to end of next week.
Expect a return to a drier trade wind pattern to become established within the next 24 hours or so. Mid and upper level ridging will help to maintain that drier trade wind pattern into next week. Clouds and showers will be riding in on the trade wind flow, and remain focused over the typical windward sides of the islands. Those showers will be concentrated during the overnight and morning hours. Clouds and limited showers are also expected over the west slopes of the Big Island mainly during the afternoon and evening hours.
The breezy trades will hold today, and then ease into the light to moderate range over the weekend as the ridge to the north weakens to a low passing far to the north. The southern extent of a mid- to upper- level trough associated with this system will pass near the islands to the north late today and into the weekend, which could support a slight increase in windward shower coverage during the overnight/early mornings. Rising upper heights along with a strengthening surface ridge to the north will support dry conditions prevailing early next week with breezy easterly trades returning.

Aviation

Moderate trade winds will remain in place today then will weaken gradually later this evening into the weekend. A band of low clouds and showers will continue bringing MVFR clouds and showers to the windward portions of the islands with improving conditions expected by mid morning. Trade wind showers could then increase again by this evening.
AIRMET Sierra for tempo mountain obscuration remains in effect for Kauai, Oahu, Molokai, and Maui and will likely be cancelled later this morning as showers are expected to decrease in coverage.

Marine

A series of surface highs will build and pass north of the state through early next week. Moderate to locally strong trades will persist today, then weaken slightly over the weekend. A Small Craft Advisory (SCA) is in effect until 6 PM HST today for the typical windy zones around Maui County and the Big Island. Trades will become fresh to locally strong again early next week.
Moderate surf along south facing shores will decline slightly today. A series of small, medium period swells will persist through the weekend keeping south facing shores from going flat. Small, short- period north swell will continue into into the weekend. A larger moderate medium period north swell reinforcement will arrive early Sunday. Surf along east facing shores will remain small but can expect a minor boost as winds pick up Monday.

HFO Watches/Warnings/Advisories

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

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Data Courtesy of NOAA.gov