Hilo

Tonight: Mostly cloudy with scattered showers. Lows 61 to 68 near the shore to 48 to 55 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs 78 to 83 near the shore to around 67 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Saturday Night: Mostly cloudy. Scattered showers in the evening, then showers likely after midnight. Lows 62 to 69 near the shore to 49 to 56 at 4000 feet. North winds up to 15 mph. Chance of rain 70 percent.

Kona

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Haze through the night. Lows around 71 near the shore to 45 to 51 near 5000 feet. Light winds. Chance of rain 50 percent.

Saturday: Mostly sunny in the morning then becoming partly sunny. Isolated showers. Haze. Highs 83 to 88 near the shore to around 66 near 5000 feet. West winds up to 10 mph. Chance of rain 20 percent.

Saturday Night: Partly cloudy with isolated showers. Haze. Lows around 71 near the shore to 46 to 51 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows 61 to 69 near the shore to 51 to 59 near 3000 feet. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 30 percent.

Saturday: Mostly sunny. Windy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 79 near the shore to 70 to 78 near 3000 feet. East winds 10 to 30 mph. Chance of rain 30 percent.

Saturday Night: Breezy. Partly cloudy with isolated showers. Lows 61 to 70 near the shore to 52 to 61 near 3000 feet. East winds 10 to 25 mph decreasing to up to 25 mph after midnight. Gusts up to 45 mph. Chance of rain 20 percent.

Kohala

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows 61 to 69 near the shore to 51 to 59 near 3000 feet. East winds 10 to 25 mph with gusts to 45 mph. Chance of rain 30 percent.

Saturday: Mostly sunny. Windy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 79 near the shore to 70 to 78 near 3000 feet. East winds 10 to 30 mph. Chance of rain 30 percent.

Saturday Night: Breezy. Partly cloudy with isolated showers. Lows 61 to 70 near the shore to 52 to 61 near 3000 feet. East winds 10 to 25 mph decreasing to up to 25 mph after midnight. Gusts up to 45 mph. Chance of rain 20 percent.

South Big Island

Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Haze through the night. Lows around 71 near the shore to around 50 near 5000 feet. Northeast winds up to 20 mph becoming 10 to 15 mph after midnight. Chance of rain 20 percent.

Saturday: Mostly sunny. Breezy and haze. Highs around 86 near the shore to around 66 near 5000 feet. East winds up to 25 mph.

Saturday Night: Mostly clear. Breezy and haze. Lows around 72 near the shore to around 51 near 5000 feet. Northeast winds 10 to 20 mph.

Puna

Tonight: Mostly cloudy with scattered showers. Lows 61 to 68 near the shore to 48 to 55 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs 78 to 83 near the shore to around 67 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Saturday Night: Mostly cloudy. Scattered showers in the evening, then showers likely after midnight. Lows 62 to 69 near the shore to 49 to 56 at 4000 feet. North winds up to 15 mph. Chance of rain 70 percent.

Waikoloa

Tonight: Mostly clear. Breezy and haze. Lows 69 to 74 near the shore to 47 to 53 above 4000 feet. East winds up to 25 mph with gusts to 45 mph.

Saturday: Sunny and windy. Haze through the day. Isolated showers in the afternoon. Highs 82 to 90 near the shore to 64 to 72 above 4000 feet. Northeast winds up to 30 mph. Chance of rain 20 percent.

Saturday Night: Mostly clear. Breezy and haze. Lows 70 to 75 near the shore to 48 to 53 above 4000 feet. East winds up to 25 mph shifting to the southeast up to 15 mph after midnight.

Detailed Forecast

Synopsis

High pressure north of the islands will maintain breezy easterly trade winds through the forecast period. Clouds and showers will favor windward and mauka areas, particularly at night and during the early morning hours, with a few showers occasionally spilling into leeward areas due to the strength of the trades. Some shower development is also expected each afternoon over Kona slopes of the Big Island.

Discussion

High pressure north of the islands continues to produce breezy easterly trade winds across the state. Satellite imagery shows partly cloudy skies across the region this afternoon, with the typical distribution of clouds over most windward and mauka areas and the Kona slopes of the Big Island. Radar imagery also shows generally dry conditions with isolated showers embedded in the trade wind flow. Kauai remains an exception to our normal trade wind conditions, with mostly cloudy skies and scattered showers moving across the island this afternoon as an area of enhanced moisture lingers upstream.
Guidance continues to show high pressure shifting eastward tonight then northeastward on Saturday. This will maintain our breezy trade wind pattern through early next week. Trade may ease slightly during the middle to latter part of next week as a front passes north of the state. Otherwise, expect fairly typical trade wind weather with clouds and showers favoring windward and mauka areas, particularly at night and during the early morning hours. Due to the breezy trades a few of these showers will occasionally spill over into leeward areas. Will also see some afternoon shower development over the Kona slopes of the Big Island.

Aviation

Breezy trades will continue through the next several days. Low cigs and SHRA should be focused over windward and mauka areas with limited spillover to leeward areas. MVFR conds expected in heavier SHRA, otherwise VFR prevails.
AIRMET Tango remains in effect for mod low-level turb over all islands. This will likely be needed for the next several days due to the breezy trades.

Marine

Fresh to strong easterly trades will persist through early next week as a surface ridge remains anchored north of the islands. A Small Craft Advisory remains in effect for the typical windier waters and channels around Maui County, the Big Island, and Kauai. The advisory may need to be expanded to Maui County windward waters and the Kaiwi Channel as trades strengthen slightly during over the weekend.
Surf along south-facing shores will trend up above average this weekend as a long period SSW swell arrives. Forerunners will begin filling in this evening with surf peaking late Saturday through Sunday. This swell peaked above guidance at the American Samoan PacIOOS buoy Tuesday night into Wednesday, which will translate to a peak locally late Saturday into Sunday, likely driving surf to the advisory threshold. A gradual downward will follow early next week.
Surf along east-facing shores will remain rough and choppy with heights hovering around average each day.
Surf along exposed north-facing shores will remain small through the weekend, with mainly background short period NNE energy continuing. A long period NW swell arriving late Sunday will lead to the surf picking back up to near average levels as it peaks Monday. Expect this trend to remain steady Tuesday through midweek as another medium-period pulse out of the same direction arrives Tuesday night. Expect a downward trend through the second half of next week.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Saturday 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