Weather Forecast

Maui Weather Forecast for August 12, 2021

August 12, 2021, 7:15 AM HST
Listen to this Article
5 minutes
Loading Audio... Article will play after ad...
Playing in :00
A
A
A

no slideshow

Photo Credit: Tyler Rooke

West Side

Today: Sunny and breezy. Highs 80 to 94. East winds 10 to 20 mph.

Tonight: Breezy. Partly cloudy with isolated showers. Lows 70 to 76. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

Friday: Mostly sunny. Breezy. Isolated showers in the morning. Highs 79 to 94. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

South Side

Today: Sunny and breezy. Highs around 90. North winds up to 20 mph increasing to 10 to 20 mph in the afternoon.

Tonight: Partly cloudy. Breezy. Isolated showers after midnight. Lows 69 to 76. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

ARTICLE CONTINUES BELOW AD

Friday: Mostly sunny. Isolated showers in the morning. Highs around 90. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

North Shore

ARTICLE CONTINUES BELOW AD

Today: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 78 to 85 near the shore to around 69 near 5000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 40 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 73 near the shore to 50 to 56 near 5000 feet. Southeast winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 77 to 84 near the shore to around 67 near 5000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Central Maui

ARTICLE CONTINUES BELOW AD

Today: Sunny and breezy. Highs 82 to 89. Northeast winds up to 20 mph increasing to 10 to 20 mph in the afternoon.

Tonight: Partly cloudy. Isolated showers after midnight. Lows around 71. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Friday: Mostly sunny. Isolated showers in the morning. Highs 82 to 88. East winds 10 to 15 mph. Chance of rain 20 percent.

Upcountry

Today: Sunny with isolated showers. Highs around 66 at the visitor center to around 62 at the summit. East winds up to 15 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 47 at the visitor center to around 44 at the summit. East winds up to 25 mph. Chance of rain 50 percent.

Friday: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 65 at the visitor center to around 61 at the summit. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

East Maui

Today: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 78 to 85 near the shore to around 69 near 5000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 40 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 73 near the shore to 50 to 56 near 5000 feet. Southeast winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 77 to 84 near the shore to around 67 near 5000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Lanai City

Today: Sunny and breezy. Highs 73 to 83. Northeast winds 10 to 20 mph.

Tonight: Partly cloudy. Breezy. Isolated showers after midnight. Lows around 67. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

Friday: Mostly sunny. Breezy. Highs 72 to 82. Northeast winds 10 to 20 mph.

Kaunakakai

Today: Sunny and breezy. Highs 69 to 92. Northeast winds 10 to 20 mph.

Tonight: Partly cloudy. Breezy. Isolated showers after midnight. Lows 59 to 76. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

Friday: Mostly sunny. Breezy. Isolated showers in the morning. Highs 68 to 91. East winds 15 to 20 mph. Chance of rain 20 percent.

Detailed Forecast

Synopsis

High pressure to the north will maintain moderate to occasionally breezy trades over the region through the weekend. Clouds and showers will be focused over the windward and mauka areas as a result.

Discussion

A surface ridge north of the islands is associated with high pressure far northeast of the islands. This will maintain a trade wind flow through the weekend. A northeast to southwest oriented mid to upper level trough is to the west of the islands, and helping to bring some high clouds to Kauai and adjacent waters. The upper level trough is slowly lifting northward and is pulling the high clouds away from the islands. High clouds have pretty much cleared Oahu overnight, but linger over and near Kauai.
Expect moderate trade winds today, with a bit of an uptick possible in the winds tomorrow and Saturday. The forecast has some weakening of the trades in place for the early part of the new week.
Very few changes to the general forecast philosophy have been made with the morning package. Models remain in agreement with high pressure to the north remaining the dominant feature into next week. However some changes in the strength of the high will alter the wind speeds at times. Meanwhile, clouds and showers will continue to be carried in on the trades. Precipitable water values from the overnight soundings have 1.25-1.50 inches near the islands which is at or just below normal. Expect slightly drier PW values through the weekend, which will likely result in lighter rainfall totals. An uptick in PW looks to be in store by Tuesday.

Aviation

High pressure north of the state will keep moderate trade winds in place during the next 24 hours, with locally breezy and gusty conditions at some of the terminals from mid morning through late this afternoon. Rather dry weather is expected statewide today, with just a few showers moving into windward slopes and coasts, and a few daytime heating driven showers developing over leeward sections of the Big Island. A more typical trade wind shower pattern should return this evening, bringing scattered showers to windward areas and sending a stray shower into leeward communities from time to time.
No AIRMETs are in effect and none are expected today.

Marine

A northeast to southwest oriented surface ridge located almost 750 nm north of Honolulu will maintain moderate trades today. A new surface high pressure system will build north of the islands as we head into the weekend. Locally strong trade winds are expected to return starting Friday with Small Craft Advisory (SCA) conditions likely developing across the typically windier waters adjacent to the islands of Maui County and the Big Island. This SCA will likely persist through Saturday for these waters. The trades are expected to gradually weaken from Sunday into early next week due to a surface trough passing by to the north of the state.
The current south-southwest swell is expected to gradually lower through tonight. A small, reinforcing southwest swell is expected to arrive Friday, followed by a larger swell from the same direction starting Sunday. The latter swell will likely be long- lived, with a peak in the Tuesday through Wednesday time period next week.
Tropical cyclone activity in the northwest Pacific has been sending small, back-to-back west-northwest swell energy toward the region. The current west-northwest swell will likely trend down through this morning. Another small, reinforcing west-northwest swell will likely reach the western islands later today. A slightly larger west-northwest swell may arrive this weekend, and persist through Tuesday.
Surf along east facing shores will continue to lower due to the lighter trade winds locally and upstream of the islands. There may be a tiny, short-period northeast swell this weekend, but surf will likely remain small along east facing shores into early next week.

HFO Watches/Warnings/Advisories

None.

Maui Now Weather is brought to you by Blue Hawaiian Helicopters.

Check out their Maui Helicopter Tours today!

Data Courtesy of NOAA.gov

E-Mail Newsletters Receive daily or weekly updates via e-mail. Subscribe Now
News Alerts Breaking news alerts on your mobile device. Get the App

Comments

This comments section is a public community forum for the purpose of free expression. Although Maui Now encourages respectful communication only, some content may be considered offensive. Please view at your own discretion. View Comments