Hilo

Rest Of Today: Partly sunny. Occasional showers in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 80 percent.

Tonight: Mostly cloudy with showers likely. Lows around 67 near the shore to around 53 at 4000 feet. North winds up to 10 mph. Chance of rain 70 percent.

Saturday: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Kona

Rest Of Today: Mostly sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 82 to 87 near the shore to around 69 near 5000 feet. West winds up to 10 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy after midnight. Lows 68 to 74 near the shore to around 54 near 5000 feet. Light winds. Chance of rain 40 percent.

Saturday: Mostly sunny in the morning, then partly sunny with scattered showers in the afternoon. Highs 82 to 87 near the shore to around 69 near 5000 feet. Light winds. Chance of rain 50 percent.

Waimea

Rest Of Today: Partly sunny. Breezy. Showers likely in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 70 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 67 near the shore to 55 to 61 near 3000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Kohala

Rest Of Today: Partly sunny. Breezy. Showers likely in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 70 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 67 near the shore to 55 to 61 near 3000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82 near the shore to 69 to 79 near 3000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

South Big Island

Rest Of Today: Breezy. Mostly sunny in the morning, then cloudy with scattered showers in the afternoon. Highs around 86 near the shore to around 73 near 5000 feet. East winds up to 20 mph. Chance of rain 50 percent.

Tonight: Partly cloudy. Lows around 69 near the shore to around 52 near 5000 feet. Northeast winds 10 to 15 mph.

Saturday: Mostly sunny. Isolated showers in the afternoon. Highs around 86 near the shore to around 73 near 5000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

Puna

Rest Of Today: Partly sunny. Occasional showers in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 80 percent.

Tonight: Mostly cloudy with showers likely. Lows around 67 near the shore to around 53 at 4000 feet. North winds up to 10 mph. Chance of rain 70 percent.

Saturday: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs around 84 near the shore to 69 to 74 at 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Waikoloa

Rest Of Today: Mostly sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 86 near the shore to 70 to 76 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated showers in the evening. Lows 69 to 74 near the shore to 50 to 57 above 4000 feet. Light winds. Chance of rain 20 percent.

Saturday: Mostly sunny. Isolated showers in the afternoon. Highs around 86 near the shore to 70 to 76 above 4000 feet. Light winds. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Trade winds will decrease slowly through Saturday, then more rapidly from Sunday into the middle of next week. Low clouds and showers will favor windward areas, especially during nights and mornings, through Saturday. Fewer windward showers are expected Sunday and afterwards, with increased afternoon clouds and showers expected over leeward and interior areas.

Discussion

There is little to no change in forecast philosophy from last evening. A high far northeast of the islands will drift east over the next few days, causing our moderate to locally breezy trade winds to gradually decrease. Trade winds will continue to deliver showers to windward areas, mainly during nights and mornings. Leeward Big Island slopes will see a few afternoon showers.
Models show an upper low northeast of the islands will become better developed and move generally west over the next few days, gradually inducing the formation of a broad low-level trough. This trough will pass north of the islands, causing trade winds to become light from Sunday into the middle of next week. With lighter winds, expect fewer windward showers. Across leeward areas, overnight and morning land breezes will give way to afternoon sea breezes which will increase cloud cover and produce a few showers. By midweek, models indicate the possibility of cold air aloft destabilizing our airmass, most notably over the western end of the island chain.

Aviation

Moderate to breezy easterly trade winds will continue through the 24-hr forecast period, with clouds and showers favoring windward and mountain locations. Periods of MVFR CIGS/VIS are possible in and around passing showers, especially through the overnight and early morning hours. AIRMET Tango will likely be dropped later this morning as the trades begin to ease slightly.

Marine

Trade winds will gradually ease over the weekend and into early next week as a weak surface trough approaches and passes north of the state. This will result in light winds with localized land/sea breezes developing by early in the new week. The Small Craft Advisory that had been in effect has been cancelled as winds are on the decrease.
A small south swell is expected over the weekend and will likely boost surf to around the summer average on south facing shores. A small southeast swell is also expected early next week. Surf along east facing shores will gradually decrease over the next several days as the trade wind flow weakens. No significant swells are expected through next week.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov