Glenn James

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

 

The latest update to this website was at 1224pm Friday afternoon HST


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

0.49 Mount Waialeale, Kauai
0.45  Punaluu Stream, Oahu
0.80  Puu Alii, Molokai
0.00  Lanai
3.75  Puu Kukui, Maui
1.19  Puu Waawaa, Big Island


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

25  Lihue, Kauai – NE
38  Kuaokala, Oahu – NNE
31  Makapulapai, Molokai – E
31  Lanai 1, Lanai – NE
45  Na Kula, Maui – SE
52  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

1039am, mostly sunny here on Maui, except for scattered showers along the windward sides, and over the West Maui Mountains of course.

 

Interesting Weather web blog: Mauka Showers…The Wet Dry Season of 2026

 

Hawaii’s Weather Highlights…as of Friday afternoon: Moderate to breezy trades will persist through the middle of next week, with minor fluctuations in speed. Brief pulses of enhanced showers will roll through on the trades during this time period, with showers favoring windward and mauka areas in the overnight to early morning hours.

Short Term Update: Radar and satellite imagery show scattered showers moving into mainly windward and mauka areas of the state, and this activity is expected to continue over the next couple of hours. Looking just upstream, a plume of deeper moisture will arrive on the trades by sometime this afternoon for the eastern end of the state, and work its way across the island chain.

This will result in a slight increase in windward and mauka shower activity as this plume of deeper moisture rolls through. These showers may produce brief moderate downpours at times, but they will move through rather quickly, so flooding is not expected to be an issue. Otherwise, high pressure to the far north will gradually build through the weekend as it edges eastward, which will help to strengthen the trades to moderate to locally breezy levels.

Weather Narrative…as of Friday afternoon: 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 afternoon: 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

 



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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

Remnants of Tropical cyclone (Simon) is located about 305 miles west-northwest of Cabo Corrientes, Mexico – Last Advisory

SIMON DISSIPATES

According to the NHC advisory number 38 

The remnants are moving toward the northwest near 13 mph. Maximum sustained winds have decreased to near 35 mph with higher gusts. The estimated minimum central pressure is 1006 mb (29.71 inches).

cone graphic

 

Tropical cyclone 21E (Trudy) is located about 315 miles south-southeast of Manzanillo, Mexico

HURRICANE WARNING EXTENDED ALONG THE COAST OF MEXICO…HURRICANE HUNTER AIRCRAFT REPORTS THAT TRUDY IS A CATEGORY ONE HURRICANE

According to the NHC advisory number 14 

Trudy is moving toward the north-northwest near 5 mph. A northwestward motion at a faster forward speed is forecast through Sunday. On the forecast track, the center of Trudy will approach the coast of southwestern and west-central Mexico on Saturday and pass near the coast Saturday night into Sunday. Reports from an Air Force Reserve Hurricane Hunter aircraft indicate that maximum sustained winds are near 85 mph with higher gusts. Slight strengthening is possible Saturday and Saturday night. Hurricane-force winds extend outward up to 30 miles from the center and tropical-storm-force winds extend outward up to 140 miles. The minimum central pressure estimated from the Hurricane Hunter aircraft data is 982 mb (29.00 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 328 NM east-southeast of Andersen AFB                                                                                                   

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Tropical Cyclone 01P…is located approximately 437 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