Glenn James

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

 

The latest update to this website was at 630pm Tuesday evening HST


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

0.32  Mount Waialeale, Kauai
0.47  Poamoho RG 1, Oahu
0.05  Makapulapai, Molokai
0.00  Lanai
0.70  Na Kula, Maui
1.96  Pahoa, Big Island


The following numbers represent the strongest wind gusts (mph) Tuesday evening:

20  Port Allen, Kauai – E
23  Honolulu AP, Oahu – ENE
23  Makapulapai, Molokai – E
30  Kealia Pond, Maui – NE
27  Kealakomo, Big Island –  ENE


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 (currently out of service). 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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Thunderstorms far 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 Tuesday comments:  I’m at home here in upper Kula, Maui, Hawaii

451am, it’s clear here at my place, the low temperature was 58 degrees, relative humidity is 83%…with calm winds

653am, clear and less vog than yesterday thank goodness, as I can get out for my morning walk.

944am, clouds are forming over and around the mountains, leaving the coasts still sunny here on Maui.

230pm, mostly sunny here on Maui, other than a few clouds around the mountains.

504pm, sunny, sunny, and more sunny here on Maui!

630pm, beautiful crescent moon in the southwest horizon

I just heard on the radio that the world record pumpkin this year weighed over 3,100 pounds…grown here in the United States!

 

Hawaii’s Weather Highlights…as of Tuesday evening: Moderate trades will gradually build breezy levels tonight through Thursday, as weak troughing around the state dissipates, and a new surface high develops north of the state. Expect limited clouds and showers to focus along windward and mauka areas, particularly overnight and early morning hours. Slightly wetter trade wind showers will be possible late Friday into the weekend. A drier trade wind pattern may develop early next week.

Weather Narrative…as of Tuesday evening: Limited clouds and showers can be seen mainly along windward and mauka areas, except for the Big Island where light to moderate showers are developing along the kona slopes. Starting tonight, an upper level trough will have moved east of the state, while mid level ridging continues to limit clouds and showers to windward and mauka locations, especially overnight and early morning Wednesday. Rainfall totals are expected to be less than what was observed overnight Monday into Tuesday morning.

A surface high will develop and shift northwest of the state Wednesday, allowing trade winds to gradually strengthen to more typically breezy levels throughout the day and Thursday, as the high settles north of the state. During this time mid and upper level ridging will maintain a dry and stable trade wind pattern, while passing bands of low level clouds and showers embedded within the trade wind flow focuses light showers along windward and mauka areas.

An upper level trough will approach the state Friday, just as an area of enhanced low level moisture moves from east to west across the state Friday afternoon into Saturday, increasing chances of showers for windward and mauka slopes. Cooling temperatures in the mid levels could make for some brief heavy showers. Although, there will be some lingering instability over the state for the rest of the weekend, there could be an over all drying trend, as low level moisture becomes limited into early next week.

Fire Weather:  Moderate trade winds will gradually strengthen to typical breezy levels by Thursday. Dry air will keep RH levels near critical values each afternoon for parts of the state over the next several days. RH values will increase towards the end of the week, before another drying trends begins over the weekend into early next week. Inversion heights tonight will range from 5,000 to 6,000 feet.

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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 Tuesday evening: Troughs to the west and east, coupled with the high to the far northeast with an accompanying ridge north of the islands will maintain gentle to moderate trade winds through tomorrow. As the troughs weaken, the pressure gradient will tighten, and trades will strengthen to moderate to locally fresh Thursday. Winds may strengthen to Small Craft Advisory (SCA) levels as early as Wednesday night in some of the typical windier waters near Maui and the Big Island. Winds are then expected to remain at SCA levels through the weekend.

The current long period northwest swell will linger into tomorrow, holding surf near seasonal average for north and west facing shores, before declining Wednesday night through Friday. By late Friday, a medium period north- northwest swell will build and once again help bring surf to near seasonal averages through the weekend.

The long period south-southwest swell will keep surf along south facing shores elevated through tomorrow. Another long period south swell will help produce surf near seasonal average Thursday into early this weekend.

Surf along east facing shores will remain small through Thursday as small wind waves and tiny east swell persist. Choppy surf will increase slightly as trade winds strengthen across the region Friday into the weekend.

 

>>> Highest Temperature Monday, October 13, 2026 – 103 degrees at Rio Grande Village, TX


>>>
Lowest Temperature Monday, October 13, 2026 – 8 degrees near Frenchglen, OR

 

Hawaii Landscape Photography | Tropical Island Art | Max Foster Photography


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 125 miles west of Cabo Corrientes, Mexico

SMALL SIMON STRENGTHENS OFF WEST-CENTRAL MEXICO…INTERESTS THERE AND BAJA CALIFORNIA SUR SHOULD CONTINUE TO MONITOR THE HURRICANE

According to the NHC advisory number 27 

Simon is drifting toward the west near 2 mph. The hurricane is forecast to move very slowly and erratically over the next couple of days. An eventual turn to the north or north-northwest is forecast to occur late this week. Maximum sustained winds have increased to near 110 mph with higher gusts. Some additional strengthening is possible overnight, and Simon could become a major hurricane again. Gradual weakening is forecast beginning Wednesday. Hurricane-force winds extend outward up to 10 miles from the center and tropical-storm-force winds extend outward up to 35 miles. The estimated minimum central pressure is 965 mb (28.50 inches).

cone graphic

 

Tropical cyclone 21E (Trudy) is located about 725 miles southeast of Manzanillo, Mexico

TRUDY FORECAST TO RAPIDLY INTENSIFY AND BECOME A HURRICANE TOMORROW…RESIDENTS OF SOUTHWESTERN AND WEST-CENTRAL MEXICO SHOULD MONITOR THE PROGRESS OF THIS SYSTEM

According to the NHC advisory number 3 

Trudy is moving toward the northwest near 10 mph. A motion between west-northwest and northwest should continue through Wednesday night. A turn toward the north-northwest and a decrease in forward speed is expected on Thursday. Maximum sustained winds are near 45 mph with higher gusts. Rapid intensification is forecast during the next few days, and the cyclone is expected to become a hurricane by Wednesday night and a major hurricane by Friday. Tropical-storm-force winds extend outward up to 70 miles from the center. The estimated minimum central pressure is 1004 mb (29.65 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 27W (Koguma)…is located approximately 752 NM east of Misawa, Japan – Final Warning

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Tropical Cyclone 28W…is located approximately 274 NM south-southeast of Iwo To

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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