Hilo

Tonight: Mostly cloudy. Isolated showers early in the evening, then scattered showers in the late evening and overnight. Haze through the night. Lows 62 to 68 near the shore to 48 to 55 at 4000 feet. Southeast winds up to 10 mph shifting to the west after midnight. Chance of rain 40 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Haze through the day. Highs 79 to 84 near the shore to around 68 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 40 percent.

Saturday Night: Partly cloudy. Isolated showers early in the evening, then scattered showers in the late evening and overnight. Haze through the night. Lows 62 to 68 near the shore to 48 to 55 at 4000 feet. South winds up to 10 mph. Chance of rain 40 percent.

Kona

Tonight: Mostly cloudy with isolated showers. Haze. Lows around 71 near the shore to 46 to 51 near 5000 feet. Northwest winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Saturday: Partly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Haze through the day. Highs around 85 near the shore to around 66 near 5000 feet. Northwest winds up to 10 mph. Chance of rain 30 percent.

Saturday Night: Mostly cloudy with isolated showers. Haze. Lows around 70 near the shore to 44 to 50 near 5000 feet. Northwest winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Waimea

Tonight: Mostly cloudy. Scattered showers early in the evening. Haze through the night. Lows 61 to 69 near the shore to 52 to 61 near 3000 feet. East winds up to 15 mph shifting to the southeast after midnight. Chance of rain 40 percent.

Saturday: Partly sunny. Haze through the day. Scattered showers in the afternoon. Highs around 79 near the shore to 71 to 77 near 3000 feet. Northeast winds up to 15 mph. Chance of rain 40 percent.

Saturday Night: Partly cloudy. Scattered showers early in the evening. Haze through the night. Lows 61 to 69 near the shore to 52 to 60 near 3000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 40 percent.

Kohala

Tonight: Mostly cloudy. Scattered showers early in the evening. Haze through the night. Lows 61 to 69 near the shore to 52 to 61 near 3000 feet. East winds up to 15 mph shifting to the southeast after midnight. Chance of rain 40 percent.

Saturday: Partly sunny. Haze through the day. Scattered showers in the afternoon. Highs around 79 near the shore to 71 to 77 near 3000 feet. Northeast winds up to 15 mph. Chance of rain 40 percent.

Saturday Night: Partly cloudy. Scattered showers early in the evening. Haze through the night. Lows 61 to 69 near the shore to 52 to 60 near 3000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 40 percent.

South Big Island

Tonight: Breezy. Mostly cloudy with isolated showers. Haze. Lows around 71 near the shore to around 50 near 5000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Saturday: Partly sunny. Breezy. Isolated showers in the morning, then scattered showers in the afternoon. Haze through the day. Highs around 85 near the shore to around 65 near 5000 feet. East winds up to 20 mph. Chance of rain 30 percent.

Saturday Night: Partly cloudy with isolated showers. Haze. Lows around 71 near the shore to around 49 near 5000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Puna

Tonight: Mostly cloudy. Isolated showers early in the evening, then scattered showers in the late evening and overnight. Haze through the night. Lows 62 to 68 near the shore to 48 to 55 at 4000 feet. Southeast winds up to 10 mph shifting to the west after midnight. Chance of rain 40 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Haze through the day. Highs 79 to 84 near the shore to around 68 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 40 percent.

Saturday Night: Partly cloudy. Isolated showers early in the evening, then scattered showers in the late evening and overnight. Haze through the night. Lows 62 to 68 near the shore to 48 to 55 at 4000 feet. South winds up to 10 mph. Chance of rain 40 percent.

Waikoloa

Tonight: Mostly cloudy. Scattered showers early in the evening, then isolated showers in the late evening and overnight. Haze through the night. Lows 69 to 74 near the shore to 48 to 54 above 4000 feet. West winds up to 10 mph shifting to the south after midnight. Chance of rain 30 percent.

Saturday: Mostly cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Haze through the day. Highs 81 to 87 near the shore to 63 to 70 above 4000 feet. Northwest winds up to 10 mph. Chance of rain 30 percent.

Saturday Night: Mostly cloudy with scattered showers early in the evening, then partly cloudy with isolated showers in the late evening and overnight. Haze through the night. Lows 68 to 74 near the shore to 47 to 53 above 4000 feet. West winds up to 10 mph in the evening becoming light. Chance of rain 30 percent.

Detailed Forecast

Synopsis

Winds will weaken this weekend with land and sea breezes becoming dominant. A disturbance aloft could bring some unsettled weather and locally heavy rainfall to the islands early next week. A return to more typical trade wind weather featuring mainly windward and mauka showers may return during the latter part of next week.

Discussion

A 1012 mb surface low is centered 850 miles northwest of Kauai, while a 1029 mb high is centered around 1500 miles north northeast of Honolulu. Between these two features lies a band of thunderstorms along a trough of low pressure stemming from the low, which passes around 150 miles northwest of Kauai. Visible satellite shows thin cirrus clouds tracking across the main Hawaiian Islands. At the low levels, moderate southeast flow across the state are pushing a few clouds with isolated showers onto windward and southeast slopes, but overall mostly dry conditions expected through night. A slight chance of thunderstorms possible tonight for waters north and west of Kauai along the eastern fringes of the trough, but stability is expected to increase this weekend.
The surface low will shift eastward this weekend, then dampen into a trough over the islands early next week. This will ease the east-southeast flow allowing for daytime sea breezes and nighttime land breezes to become dominant across the state this weekend through the middle of next week. Low clouds and showers will favor leeward and interior sections in the afternoon and evening hours, and east and southeast facing slopes and coasts overnight and during the morning hours, with most showers over the coastal waters or near the immediate coast overnight. A disturbance aloft diving southward over the state could bring locally heavy rainfall to portions of the island chain Tuesday into Wednesday.
The trough will then fizzle out with a gradual return and strengthening of the trade winds across the state for the second half of next week featuring mainly windward and mauka showers.

Aviation

Light winds with a background southeasterly flow will continue to persist through Saturday. Winds will be light enough for localized land breezes to develop tonight and sea breezes during the day Saturday. Clouds and scattered showers may produce brief MVFR conditions tonight. A strong upper level jet passing just south of the state will produce a stream of high clouds and moderate upper level turbulence across the entire state through tonight and possibly into Saturday. AIRMET TANGO is in effect for moderate turbulence between FL280 and FL400.

Marine

Locally fresh southeast winds will gradually ease and become light and variable over the weekend as low pressure northwest of the Islands slowly weakens and shifts northward. Light flow will continue into Monday and Tuesday. Trade winds will eventually return midweek. A slight chance of thunderstorms remains northwest of Kauai through late tonight.
Existing small northwest swell will continue to fade, but a new slightly larger long-period northwest swell is forecast to build in overnight, peak Saturday night or Sunday, then fade through early next week. Surf along north and west facing shores is expected to remain small for the coming week.
Multiple small early season south swells will maintain small background southerly energy into the coming week. Weak upstream trade wind flow will keep surf along east facing shores near or below seasonal averages.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov