Hilo

Today: Partly sunny with scattered showers. Highs 77 to 83 near the shore to 64 to 72 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy. Numerous showers in the evening, then frequent showers after midnight. Lows 62 to 71 near the shore to 53 to 58 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 80 percent.

Saturday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 78 to 83 near the shore to 65 to 72 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 70 percent.

Kona

Today: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 86 near the shore to around 70 near 5000 feet. West winds up to 10 mph. Chance of rain 20 percent.

Tonight: Mostly clear with isolated showers. Lows 68 to 73 near the shore to 47 to 55 near 5000 feet. East winds up to 10 mph. Chance of rain 20 percent.

Saturday: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs 83 to 88 near the shore to around 70 near 5000 feet. Light winds. Chance of rain 40 percent.

Waimea

Today: Breezy. Partly sunny with scattered showers. Highs 65 to 84. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 63 to 69 near the shore to 54 to 62 near 3000 feet. East winds 10 to 20 mph decreasing to up to 20 mph after midnight. Gusts up to 45 mph. Chance of rain 50 percent.

Saturday: Breezy. Partly sunny with scattered showers. Highs 67 to 84. East winds 15 to 20 mph. Chance of rain 50 percent.

Kohala

Today: Breezy. Partly sunny with scattered showers. Highs 65 to 84. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 63 to 69 near the shore to 54 to 62 near 3000 feet. East winds 10 to 20 mph decreasing to up to 20 mph after midnight. Gusts up to 45 mph. Chance of rain 50 percent.

Saturday: Breezy. Partly sunny with scattered showers. Highs 67 to 84. East winds 15 to 20 mph. Chance of rain 50 percent.

South Big Island

Today: Mostly sunny. Breezy. Highs around 84 near the shore to around 69 near 5000 feet. East winds up to 25 mph.

Tonight: Mostly clear. Breezy. Isolated showers in the evening. Lows around 71 near the shore to around 50 near 5000 feet. Northeast winds 10 to 25 mph. Chance of rain 20 percent.

Saturday: Mostly sunny. Breezy. Isolated showers in the afternoon. Highs around 84 near the shore to around 68 near 5000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Puna

Today: Partly sunny with scattered showers. Highs 77 to 83 near the shore to 64 to 72 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy. Numerous showers in the evening, then frequent showers after midnight. Lows 62 to 71 near the shore to 53 to 58 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 80 percent.

Saturday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 78 to 83 near the shore to 65 to 72 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 70 percent.

Waikoloa

Today: Mostly sunny. Breezy. Isolated showers in the morning. Highs 82 to 89 near the shore to 67 to 73 above 4000 feet. Northeast winds up to 25 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Breezy. Isolated showers in the evening. Lows around 72 near the shore to 47 to 55 above 4000 feet. Southeast winds up to 25 mph. Chance of rain 20 percent.

Saturday: Sunny. Highs 82 to 88 near the shore to 67 to 74 above 4000 feet. North winds up to 15 mph.

Detailed Forecast

Synopsis

Fresh to locally strong trade winds will continue through early next week. A band of clouds and showers mainly north of the state will support wet conditions over windward Kauai through early Saturday while a gradual drying trend can be expected elsewhere through the weekend.

Discussion

Fresh to locally strong trade winds will continue through early next week as a broad area of high pressure sets up north of the state. A band of clouds and showers associated with an old front will support wet conditions over Kauai, particularly the windward section, through Friday. The remaining islands will get scattered windward showers carrying in with the trade winds and tonight. Isolated showers will blow over the smaller islands at times.
Regional model analyses and the CIMMS MIMIC PWAT product indicate a drier airmass extending from about 152W, east of the Big Island, to the Southern California/Baja coast. Trades will advect this airmass across the state, reaching the Big Island early Friday morning, the central portion of the state by late Friday and Kauai by Saturday morning. Expect the drier weather to continue through the weekend into early next week.
Trades will begin to weaken and veer east southeasterly during the first half of next week as ridging runs its course and a fresh round of height falls over the north Pacific gets underway.

Aviation

Moderate trade wind flow will continue to steer bands of low topped cumulus towards the Hawaiian Islands. Showers will impact mainly north and east facing slopes and coasts. Isolated spillover showers are to be expected across leeward portions of the smaller islands, especially in the late night and morning hours. Brief MVFR CIG or VIS is to be expected in showers most areas.
The remnants of a dead cold front remain draped over Kauai and are expected to linger overnight. AIRMET Sierra for mountain obscuration across Windward Kauai has been cancelled, but widespread MVFR conditions could redevelop after sunset.
Afternoon sea breezes are driving inland cumulus development across the lower slopes of the Big Island. These sea breezes will weaken and give way to land breezes by late this evening. This will have a clearing effect across leeward areas. Most south and west facing slopes of the Big Island will be cloud free by morning.

Marine

Developing high far north of the state will strengthen trade winds to moderate to locally strong tonight and tomorrow then hold through the weekend. A Small Craft Advisory (SCA) is in effect for waters northwest and lee of Kauai, and the windier waters around Maui County and south of the Big Island through early morning. This SCA will likely continue for the typically windier waters through the weekend.
A moderate north to northeast swell will subside tonight and tomorrow. The first of several small to moderate reinforcing northwest swells will fill in tomorrow keeping small to moderate surf along north and west facing shores through early next week. Expect small to moderate east facing shores surf as the current north to northeast swell fades and a building trade wind swell fills in tomorrow and holds through the weekend.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Friday for Kauai Northwest Waters, Kauai Leeward Waters, Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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Data Courtesy of NOAA.gov