Weather Forecast

Hawaii County Weather Forecast for July 16, 2021

July 16, 2021, 7:16 AM HST
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Hilo

Today: Scattered showers. Partly sunny, with a high near 84. Calm wind becoming northeast 5 to 9 mph in the afternoon. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely, mainly after midnight. Mostly cloudy, with a low around 67. Northeast wind 5 to 7 mph becoming light and variable. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Showers likely, mainly before noon. Mostly cloudy, with a high near 84. East northeast wind 6 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Kona

Today: Isolated showers after noon. Mostly sunny, with a high near 80. Southwest wind 5 to 7 mph becoming calm in the afternoon. Chance of precipitation is 20%.

Tonight: Scattered showers, mainly before midnight. Mostly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

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Saturday: Scattered showers after noon. Partly sunny, with a high near 80. Light and variable wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Waimea

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Today: Scattered showers after 1pm. Mostly sunny, with a high near 79. Windy, with a northeast wind 20 to 25 mph, with gusts as high as 36 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 59. Breezy, with an east wind around 15 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday: Scattered showers. Partly sunny, with a high near 79. East northeast wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Kohala

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Today: Scattered showers, mainly after noon. Mostly sunny, with a high near 65. Windy, with an east northeast wind 22 to 26 mph, with gusts as high as 38 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely, mainly after midnight. Mostly cloudy, with a low around 54. Breezy, with an east wind 20 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Showers likely. Mostly cloudy, with a high near 65. Breezy, with an east wind around 21 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Isolated showers before noon. Mostly sunny, with a high near 85. Windy, with an east wind 22 to 26 mph, with gusts as high as 34 mph. Chance of precipitation is 20%.

Tonight: Isolated showers. Partly cloudy, with a low around 75. Breezy, with an east northeast wind 20 to 22 mph, with gusts as high as 28 mph. Chance of precipitation is 20%.

Saturday: Isolated showers. Partly sunny, with a high near 85. Breezy, with an east wind 20 to 22 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.

Puna

Today: Scattered showers. Partly sunny, with a high near 83. Breezy, with a north northeast wind 9 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely, mainly after midnight. Mostly cloudy, with a low around 65. North wind 9 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday: Showers likely, mainly before noon. Mostly cloudy, with a high near 83. Breezy, with a northeast wind 11 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Waikoloa

Today: Mostly sunny, with a high near 85. Windy, with a northeast wind 21 to 26 mph decreasing to 7 to 12 mph. Winds could gust as high as 38 mph.

Tonight: Isolated showers before midnight. Partly cloudy, with a low around 67. East wind around 7 mph. Chance of precipitation is 20%.

Saturday: Isolated showers after noon. Mostly sunny, with a high near 85. North northeast wind around 7 mph. Chance of precipitation is 20%.

Detailed Forecast

Synopsis

High pressure north of the area will support breezy trade winds through the weekend. Stronger winds may develop early next week. Low clouds will move over the islands from the east, focusing scant showers over windward areas.

Discussion

High pressure north and northeast of the islands will keep trade winds blowing across local waters for the foreseeable future. The main high will change little through today, then dissipate over the weekend as a new high builds to the north. The central pressure of this new high is expected to peak near 1038 mb early next week, steepening the pressure gradient enough to drive locally windy trades across exposed waters Monday and Tuesday. Otherwise, breezy trade winds will prevail.
An area of increased moisture embedded within trade flow will move over the islands Saturday and Saturday night, potentially fueling an increase in windward showers. Otherwise, weak mid-level ridging will give way to a weak mid-level trough over the weekend, which will likely allow low clouds to gain greater vertical depth, leading to increased trade shower coverage at times.

Aviation

Breezy easterly trade winds will continue through the weekend, with clouds and showers focusing over windward and mauka locations. MVFR CIGS/VSBYS are possible in and around passing showers. AIRMET Tango for low-level turbulence will remain in effect into the weekend.

Marine

Locally strong trade winds will persist, with an increase in trades likely early next week. Surface high pressure will remain far north of the state through the weekend, maintaining the trades at moderate to locally strong levels. A Small Craft Advisory (SCA) is in effect for the typically windy waters around the Big Island and Maui through Sunday, and also covers additional waters around Oahu and Maui County through this afternoon. As indicated above, trades are expected to increase early next week, possibly requiring an expansion of the SCA once again.
South shore surf will increase from background levels to around summertime average during the weekend. The south swell will slowly build late today, peak Saturday into Sunday, and decline early next week. East shore surf will be near or slightly above summertime average through the weekend, then build, as trade winds are expected to increase over and upwind of the islands early next week. Aside from some localized wrap of trade wind energy, surf along most north facing shores will remain nearly flat into next week.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Sunday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
Small Craft Advisory until 6 PM HST this evening for Oahu Leeward Waters, Kaiwi Channel, Maui County Windward Waters, Maui County Leeward Waters.

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Data Courtesy of NOAA.gov

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