Hilo

Today: Partly sunny with scattered showers. Highs 79 to 86 near the shore to 65 to 73 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 62 to 72 near the shore to 58 to 63 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny. Numerous light showers in the morning, then isolated light showers in the afternoon. Highs 79 to 86 near the shore to 65 to 73 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Kona

Today: Mostly sunny in the morning, then mostly cloudy with scattered showers in the afternoon. Highs 84 to 90 near the shore to 70 to 75 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.

Tonight: Mostly cloudy in the evening then becoming mostly clear. Isolated showers. Lows around 74 near the shore to around 60 near 5000 feet. Light winds. Chance of rain 20 percent.

Friday: Sunny in the morning, then mostly cloudy with isolated light showers in the afternoon. Highs 83 to 88 near the shore to around 72 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

Today: Mostly sunny. Breezy. Scattered showers early in the morning, then isolated showers in the late morning and afternoon. Highs 64 to 86. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with isolated showers in the evening, then partly cloudy with scattered showers after midnight. Lows 63 to 72 near the shore to 57 to 64 near 3000 feet. East winds 10 to 20 mph. Chance of rain 50 percent.

Friday: Mostly sunny. Breezy. Scattered light showers in the morning, then isolated light showers in the afternoon. Highs 64 to 85. East winds 10 to 25 mph. Chance of rain 50 percent.

Kohala

Today: Mostly sunny. Breezy. Scattered showers early in the morning, then isolated showers in the late morning and afternoon. Highs 64 to 86. East winds up to 25 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with isolated showers in the evening, then partly cloudy with scattered showers after midnight. Lows 63 to 72 near the shore to 57 to 64 near 3000 feet. East winds 10 to 20 mph. Chance of rain 50 percent.

Friday: Mostly sunny. Breezy. Scattered light showers in the morning, then isolated light showers in the afternoon. Highs 64 to 85. East winds 10 to 25 mph. Chance of rain 50 percent.

South Big Island

Today: Sunny and breezy. Isolated showers in the afternoon. Highs around 86 near the shore to around 70 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Lows around 74 near the shore to around 58 near 5000 feet. Northeast winds up to 15 mph.

Friday: Sunny and breezy. Isolated light showers in the afternoon. Highs around 85 near the shore to around 69 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Puna

Today: Partly sunny with scattered showers. Highs 79 to 86 near the shore to 65 to 73 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 62 to 72 near the shore to 58 to 63 at 4000 feet. Northwest winds up to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny. Numerous light showers in the morning, then isolated light showers in the afternoon. Highs 79 to 86 near the shore to 65 to 73 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Waikoloa

Today: Sunny and breezy. Isolated showers in the afternoon. Highs 84 to 92 near the shore to 68 to 74 above 4000 feet. Northeast winds up to 25 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Breezy. Lows around 74 near the shore to 57 to 63 above 4000 feet. East winds up to 20 mph.

Friday: Sunny and breezy. Isolated light showers in the afternoon. Highs 84 to 91 near the shore to 67 to 75 above 4000 feet. Northeast winds up to 25 mph. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Moderate to breezy trade winds and a typical summertime pattern of mainly windward showers will continue through the week.

Discussion

Typical summertime trade wind weather will dominate through the week. Strong high pressure will remain anchored far north of the islands, driving moderate to breezy trade winds, and a mid-level ridge parked overhead will maintain stable conditions with an inversion hovering between 5,000 to 8,000 ft. Shallow pockets of moisture riding in on the trades will periodically enhance windward rainfall, mainly at night and early in the morning, with one such area focused from Oahu to Maui this morning. No strong rainfall signatures are noted in the model guidance, though Friday and Saturday look to have some decrease in shower activity. Leeward areas will be rather dry, with the exception of afternoon clouds and scattered showers over leeward Big Island slopes each day.

Aviation

Quick-moving trade winds will persist through the evening hours, then weaken a bit on Friday. Clouds and scattered showers will mainly affect windward locations, with isolated showers occasionally spilling over to leeward locations.
AIRMET Sierra is in effect for windward exposures of Kauai, Oahu, Molokai, and Maui. Conditions are expected to improve toward noon as daytime heating encourages low clouds to lift and dissipate.
AIRMET Tango remains in effect for occasional moderate low-level turbulence to the lee of higher terrain. Conditions are expected to persist through this evening and possibly beyond.

Marine

A surface high pressure system located far north of the state will maintain locally strong trade winds across the area into early next week. A Small Craft Advisory (SCA) remains in effect through Saturday afternoon for the typically windier waters adjacent to the islands of Maui County and the Big Island. Based on the latest forecast, this SCA will likely need to be extended beyond Saturday for these same areas.
No significant swells are expected through this weekend. A mix of small, medium-period south and southwest swell energy is expected to produce small, background surf along south facing shores into this weekend. The wave model guidance indicates a small, long- period southwest swell arriving Sunday may produce a bump in surf heights along south facing shores early next week. The trade winds will likely maintain modest, choppy surf along east facing shores through this weekend. Expect nearly flat conditions to persist along north facing shores.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Saturday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Big Island Now Weather is brought to you by Blue Hawaiian Helicopters.

Check out their Big Island Helicopter Tours today!

Data Courtesy of NOAA.gov