Hilo

Today: Mostly cloudy. Breezy. Showers likely in the morning, then scattered showers in the afternoon. Highs 83 to 89 near the shore to around 73 at 4000 feet. Northeast winds up to 20 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 69 near the shore to around 54 at 4000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 83 to 89 near the shore to around 73 at 4000 feet. Northeast 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 scattered showers in the afternoon. Highs 82 to 87 near the shore to around 70 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Isolated showers. Lows 70 to 75 near the shore to around 55 near 5000 feet. Light winds. Chance of rain 20 percent.

Saturday: Mostly sunny in the morning then becoming partly sunny. Isolated showers. Highs 82 to 87 near the shore to around 70 near 5000 feet. West winds up to 10 mph. Chance of rain 20 percent.

Waimea

Today: Partly sunny. Windy. Showers likely in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to around 79 near 3000 feet. East winds 10 to 30 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy. Windy. Scattered showers in the evening, then isolated showers after midnight. Lows around 69 near the shore to 57 to 62 near 3000 feet. East winds 10 to 30 mph. Chance of rain 50 percent.

Saturday: Windy. Partly sunny with isolated showers. Highs around 83 near the shore to around 79 near 3000 feet. East winds 10 to 30 mph. Chance of rain 20 percent.

Kohala

Today: Partly sunny. Windy. Showers likely in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to around 79 near 3000 feet. East winds 10 to 30 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy. Windy. Scattered showers in the evening, then isolated showers after midnight. Lows around 69 near the shore to 57 to 62 near 3000 feet. East winds 10 to 30 mph. Chance of rain 50 percent.

Saturday: Windy. Partly sunny with isolated showers. Highs around 83 near the shore to around 79 near 3000 feet. East winds 10 to 30 mph. Chance of rain 20 percent.

South Big Island

Today: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 86 near the shore to around 71 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Breezy. Lows around 70 near the shore to around 53 near 5000 feet. Northeast winds up to 20 mph decreasing to up to 10 mph after midnight.

Saturday: Mostly sunny. Breezy. Highs around 86 near the shore to around 71 near 5000 feet. East winds up to 25 mph.

Puna

Today: Mostly cloudy. Breezy. Showers likely in the morning, then scattered showers in the afternoon. Highs 83 to 89 near the shore to around 73 at 4000 feet. Northeast winds up to 20 mph. Chance of rain 70 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 69 near the shore to around 54 at 4000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 83 to 89 near the shore to around 73 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Waikoloa

Today: Mostly sunny. Breezy. Highs 83 to 88 near the shore to 70 to 76 above 4000 feet. Northeast winds up to 25 mph.

Tonight: Partly cloudy. Breezy. Lows around 73 near the shore to 51 to 58 above 4000 feet. East winds up to 25 mph shifting to the southeast up to 15 mph after midnight.

Saturday: Mostly sunny. Breezy. Highs 83 to 88 near the shore to 70 to 76 above 4000 feet. Northeast winds up to 25 mph.

Detailed Forecast

Synopsis

Strong trade winds will persist into next week, bringing brief showers to windward and mauka areas. Fewer leeward clouds are expected over the weekend, while the Kona slopes will receive their typical summertime afternoon/evening clouds and showers.

Discussion

A westward-moving mid-level trough at 700 mb will continue to enhance windward and mauka low clouds and showers this morning. Guidance continues to show the trough dissipating tonight into Saturday. Breezy to locally windy trades will prevail into next week as the surface ridge remains far north of the islands. ENE trade winds will deliver low clouds and brief showers to windward and mauka areas through the forecast period as the atmosphere stabilizes. Leeward areas will remain mostly dry, but Kona slopes of the Big Island will see their typical summertime afternoon and evening clouds and showers. May see an uptick in windward clouds and showers late next week as a weak upper level disturbance develops north of the state.

Aviation

A weak disturbance moving through the islands will enhance low clouds, and windward showers. Breezy to locally windy trades will continue for the next few of days, with passing showers favoring windward and mountain areas. Mostly VFR conditions will prevail, with brief periods of MVFR in showers/low clouds mainly in the overnight to early morning hours.
AIRMET Sierra for tempo mountain obscuration remains in effect for north through east sections of Kauai, Oahu, Molokai, Maui and the Big Island. These low cloud ceilings will improve later this morning.
AIRMET Tango for low-level turbulence over and in the lee of island terrain will remain in effect for the next several days due to the strong trades.

Marine

Strong- to near gale-force east to northeast trades with seas up to the 10 ft advisory level will continue through early next week as the ridge holds strong to the north. The strong trades could ease slightly later next week as the ridge weakens.
Surf along east facing shores will remain rough through early next week due to the strong trades locally and upstream of the state. A downward trend is possible around midweek as the upstream fetch weakens and the local trades begin to ease.
Surf along south facing shores will remain up as overlapping south-southwest swells move through. A fresh south-southwest that has filled in will result in an gradually upward trend through Saturday. A more significant south swell will gradually fill in late Saturday night into Sunday, then likely reach the advisory level late Sunday through Monday. A gradual downward trend is expected Tuesday through midweek.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Saturday for all Hawaiian waters,

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Data Courtesy of NOAA.gov