Glenn James

Hawaii Weather Today
Creator, Author, and Administrator for over 30 years

 

The latest update to this website was at 640am Friday morning HST


Here are the latest 24-hour precipitation totals (inches) for each of the islands Friday morning: 

0.99 Wailua, Kauai
0.61  Punaluu Stream, Oahu
0.76  Puu Alii, Molokai
0.01  Lanai 1, Lanai
3.01  Puu Kukui, Maui
1.28  Spencer, Big Island


The following numbers represent the strongest wind gusts (mph) Friday morning:

21  Nawiliwili, Kauai – NE
35  Oahu Forest NWR, Oahu – NE
27  Makapulapai, Molokai – E
33  Lanai 1, Lanai – NE
44  Kealaloloa Rg, Maui – NE
55  Puuloa, Big Island – NW


Hawaii’s Mountains – Here’s a link to the live webcam on the summit of our tallest mountain Mauna Kea (~13,800 feet high) on the Big Island of Hawaii. Here’s the webcam for the (~10,023 feet high) Haleakala Crater on Maui. These webcams are available during the daylight hours here in the islands, and at night whenever there’s a big moon shining down. Also, at night you will be able to see the stars, and the sunrise and sunset too…depending upon weather conditions.


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Big Blue…click twice for largest version

 

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 Cold fronts far north…thunderstorms south in the deeper tropics


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Clear to variable cloudy over the island chain 

 

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Localized Showers 

 

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Please open this link to see details on any current Watches, Warnings and Advisories noted above




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Hawaii Weather Narrative
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Glenn’s Aloha Friday comments:  I’m at home here in upper Kula, Maui, Hawaii

445am, it’s clear to partly cloudy here at my place, the low temperature was 58 degrees, relative humidity is 83%…with calm winds

 

Hawaii’s Weather Highlights…as of Friday morning: A high pressure system far northwest of the Hawaiian Islands will slowly drift from west to east over the next few days. This passing system will increase easterly trade winds into the moderate to breezy range lasting into the middle of next week.

Brief pulses of enhanced showers are forecast with three passing easterly waves during this time period. Increasing showers will favor the windward and mauka areas in the overnight to early morning hours starting tonight, and lingering into Tuesday morning. The strongest of these three waves will pass through the islands from late Sunday through late Monday.

Weather Narrative…as of Friday morning: Radar shows scattered windward and mauka showers across the state. A large surface high continues to strengthen to our north. Aloft, a weak upper level low to our east will become a trough that stretches from southern CA all the way over to us. The trough will be weak, and apart from a slight increase in instability, we won`t see much from it.

Several impulses of increased moisture will move toward and over the state, especially the eastern end, over the coming week. The first will move through this afternoon and evening, and reach all islands. The second should move over the area late Sunday through late Monday, boosting showers mainly across the eastern end of the state. Finally, another area may reach us next Thursday, but at this time range confidence is low. Models currently indicate the focus of this one would be on the eastern end.

Trade winds will remain moderate to breezy through the coming week, with the a slight increase possible next Tuesday evening. A slight weakening may develop next Thursday, but as mentioned in the previous paragraph, at 7-days out, confidence in that level of detail is low.

Finally, guidance indicates that the upper level trough extending from southern CA over to us may join with energy moving in from the northwest, and strengthen toward the middle of next week. It is unclear at this time whether it will develop into a closed low or a stronger trough. Either way, it may draw tropical moisture northward toward the state, and present a heavy rain threat. Details should become clearer in a few days.

Fire Weather:  Surface high pressure north of the islands will produce moderate to breezy trade winds for the next few days. RH levels look to remain out of critical fire threshold ranges. The stronger trade winds will mainly impact higher elevation areas with even higher minimum humidity levels. Inversion heights should range from 6,000 to 9,000 feet today.

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Here’s a near real-time Wind Profile of the Pacific Ocean – along with a Closer View of the islands / Here’s the latest Weather Map / Looping Surface Precipitation…through the next 8-days / Vog Map

 

Marine Conditions…as of Friday morning: Surface high pressure far north of the islands will build as it shifts northeast of Hawaii through Saturday. A Small Craft Advisory (SCA) remains in effect for the typically windy waters around Big Island and Maui through Saturday, but this may need to be expanded in area as the high building to the north results in strengthening trade winds. Elevated trade winds will persist into early next week.

A small northwest swell will continue to fade as a moderate north-northwest swell arrives. Surf along north and west-facing shores should build quickly today and top out near or slightly above seasonal average during the peak of the swell this afternoon into tonight, then slowly decline Saturday and Sunday as the dropping swell shifts more northerly. A smaller overlapping northwest swell arrives on Sunday which will bolster surf briefly. Both swells fade early next week.

A new long-period south swell will peak today, pushing surf along south-facing shores back above seasonal average through tonight. This swell will slowly decline Saturday through early next week.

Surf along east-facing shores will gradually increase today as trade winds strengthen over the region. Expect some wrap from the moderate north-northwest swell Friday afternoon into Saturday. This swell along with developing rough trade wind swell will produce east shore surf above seasonal average Saturday through early next week.

 

>>> Highest Temperature Thursday, October 15, 2026 – 99 degrees at Bangor, CA


>>>
Lowest Temperature Thursday, October 15, 2026 – 15 degrees near Frenchglen, OR

 

Beneath the Surface: Marine Photography and Conservation


World-wide Tropical Cyclone Activity

 



>>>
Here’s a link to the latest Pacific Disaster Center’s
Weather Wall



Atlantic Ocean:
There are no active tropical cyclones 


Caribbean Sea:
There are no active tropical cyclones


Gulf of America:
There are no active tropical cyclones

 

Northeast Pacific

Tropical cyclone (Simon) is located about 190 miles west-southwest of Cabo Corrientes, Mexico

SMALL SIMON WEAKENING OFFSHORE OF WEST-CENTRAL MEXICO…EXPECTED TO BECOME A REMNANT LOW IN A DAY OR SO

According to the NHC advisory number 35 

Simon is moving toward the northwest near 2 mph. A faster northwestward motion is forecast to begin by Friday and continue through the weekend. Maximum sustained winds have decreased to near 45 mph with higher gusts. Continued weakening is expected, and Simon is forecast to become a post-tropical remnant low in a day or so. Tropical-storm-force winds extend outward up to 45 miles from the center. The estimated minimum central pressure is 1002 mb (29.59 inches).

cone graphic

 

Tropical cyclone 21E (Trudy) is located about 355 miles south-southeast of Manzanillo, Mexico

TRUDY STRENGTHENS…EXPECTED TO RAPIDLY INTENSIFY

According to the NHC advisory number 11 

Trudy is moving toward the north-northwest near 7 mph. This motion is expected to continue through Friday, followed by a turn toward the northwest Friday night or Saturday. On the forecast track, the center of Trudy will approach the coast of southwestern and west-central Mexico on Saturday. Maximum sustained winds have increased to near 105 mph with higher gusts. Rapid intensification is forecast, and Trudy is expected to become a major hurricane on Friday. Hurricane-force winds extend outward up to 25 miles from the center and tropical-storm-force winds extend outward up to 105 miles. The estimated minimum central pressure is 971 mb (28.68 inches).

cone graphic

 

Central North Pacific: There are no active tropical cyclones

Tropical cyclone formation is not expected during the next 7 days.

 

Northwest Pacific Ocean:

Tropical Cyclone 29W (Champi)…is located approximately 405 NM east-southeast of Andersen AFB                                                                                                   

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Tropical Cyclone 01P…is located approximately 482 NM east-northeast of Pago Pago

 

Southwest Pacific Ocean: There are no active tropical cyclones

North and South Indian Oceans / Arabian Sea: There are no active tropical cyclones

 

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Here’s the link to the Joint Typhoon Warning Center (JTWC)



Interesting: 
New Possibilities Uncovered for Efficiently Converting Sunlight Into Clean Energy

Researchers at Oregon State University have developed a new family of materials that use light to produce hydrogen from water, opening the door to new ways of converting the sun’s rays into clean energy.

A collaboration led by Kyriakos Stylianou of the OSU College of Science created a photocatalyst that enables the high-speed, high-efficiency production of hydrogen, used in fuel cells for cars as well as in the manufacture of many chemicals including ammonia, in the refining of metals and in making plastics.

A catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change, Stylianou said. Photocatalysts are materials that absorb light to reach a higher energy level and can use that energy to speed up reactions.

The findings, published in the Journal of the American Chemical Society, introduce a potential new tool to use against greenhouse gas emissions and climate change, said Stylianou, whose research focuses on crystalline, porous materials known as metal organic frameworks, or MOFs.

Read More: Oregon State University