Glenn James

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

 

The latest update to this website was at 650am Wednesday morning HST


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

0.32  Mount Waialeale, Kauai
0.28  Poamoho RG 1, Oahu
0.05  Makapulapai, Molokai
0.00  Lanai
0.03  Puu Kukui, Maui
0.99  Keahuolu, Big Island


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

14  Lawai, Kauai – ENE
18  Kuaokala, Oahu – NE
18  Anapuka, Molokai – NE
24  Kealaloloa Rg, Maui – NNE
20  Kawaihae Rd, Big Island – NE


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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Cold front northwest…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 Wednesday comments:  I’m at home here in upper Kula, Maui, Hawaii

445am, it’s clear here at my place, the low temperature was 53 degrees, relative humidity is 75%…with calm winds

I heard on NPR yesterday that the world record pumpkin this year weighed 3,156 pounds…grown here in the United States!

 

Hawaii’s Weather Highlights…as of Wednesday morning: Moderate trades will gradually build to breezy levels by Thursday, as weak troughing around the state dissipates, and a new surface high develops to the north. Expect limited clouds and showers for the next couple of days. Slightly wetter trade wind showers will be possible late Friday into the weekend, as winds become slightly stronger.

Weather Narrative…as of Wednesday morning: Mostly clear skies are prevailing across the state, with the lone exception being a few lingering clouds near Kailua-Kona on the Big Island. The trough aloft that has been lingering near the Big Island for the past few days has now moved east, as mid-level ridging builds into the area. Virtually no rainfall has occurred overnight. Surface observations from around the islands showed moderate trade winds continuing within the stable environment.

Building surface high pressure north of the state will allow trade winds to gradually strengthen over the next 24 hours, becoming breezy by Thursday then locally strong by the weekend. These breezy trades look to continue into early next week.

The ridging aloft will maintain dry and stable conditions for the next couple of days, while passing bands of low level clouds, and light, infrequent showers embedded within the trade wind flow, focus primarily along windward and mauka areas. Friday into early Saturday, a trough aloft will approach the state, just as an area of increased low-level moisture arrives from the east. This combination will increase chances of showers for windward and mauka locations. Additional increases in windward and mauka showers will be possible Saturday night and again early next week.

Fire Weather:  Moderate trade winds will gradually strengthen to 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 are expected to increase towards the end of the week, and winds will remain below critical thresholds. Inversion heights today will range from about 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 Wednesday morning: A surface ridge extending northeast of the islands will maintain gentle to moderate trade winds today. Trades will strengthen slightly on Thursday to moderate to locally fresh, as a surface high begins to build north of the area. Small Craft Advisory (SCA) levels may be reached as early as Thursday night in some of the typical windier waters near Maui and the Big Island. Trades will continue to strengthen further Friday through the weekend, as the surface high pressure to the north becomes more well established.

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

The current medium period south swell will keep surf along south facing shores elevated today. A reinforcing long period south swell will help produce surf near seasonal average tonight into early this coming 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 Friday into the weekend.

 

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


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

 

Discover the Endless Beauty of Hawaii Landscape Photography


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

Tropical cyclone (Simon) is located about 165 miles west-southwest of Cabo Corrientes, Mexico

SIMON WEAKENS WHILE DRIFTING SOUTHWESTWARD…INTERESTS IN WEST-CENTRAL MEXICO AND BAJA CALIFORNIA SUR SHOULD CONTINUE TO MONITOR THE HURRICANE

According to the NHC advisory number 29 

Simon is moving toward the southwest near 2 mph. The hurricane is likely to move slowly and erratically during the next day or two. A turn toward the north or north-northwest is forecast to occur by Friday. Maximum sustained winds are now near 90 mph with higher gusts. Some intensity fluctuations are possible through Thursday night, followed by weakening on Friday and into the weekend. Simon is a very small hurricane. 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 975 mb (28.80 inches).

cone graphic

 

Tropical cyclone 21E (Trudy) is located about 610 miles south-southeast of Manzanillo, Mexico

TRUDY EXPECTED TO BECOME A HURRICANE TONIGHT…RESIDENTS OF SOUTHWESTERN AND WEST-CENTRAL MEXICO SHOULD CONTINUE TO MONITOR THE PROGRESS OF THIS SYSTEM

According to the NHC advisory number 5 

Trudy is moving toward the west-northwest near 13 mph. A turn toward the northwest is expected by tonight, and a turn toward the north-northwest is expected on Thursday. On the forecast track, Trudy could approach the coast of southwestern Mexico on Saturday. Satellite imagery indicates that maximum sustained winds have increased to near 60 mph with higher gusts. Rapid strengthening is forecast during the next couple of days, and Trudy is forecast to become a major hurricane on Friday. Tropical-storm-force winds extend outward up to 80 miles from the center. The estimated minimum central pressure is 998 mb (29.47 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 174 NM south-southeast of Iwo To

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Tropical Cyclone 29W…is located approximately 989 NM east-southeast of Andersen AFB

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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: 
UH Study Reveals How Tilapia Adapt to Extreme Salt Stress

In the world of aquatic life, the Mozambique tilapia (Oreochromis mossambicus) is remarkably tolerant to salt water, surviving in habitats ranging from fresh water to hypersaline ponds three times saltier than the ocean.

Researchers at the University of Hawaii at M?noa’s College of Tropical Agriculture and Human Resilience (CTAHR) have unlocked one of the molecular mechanisms underlying this remarkable feat. The study, published in General and Comparative Endocrinology, was led by Andre Seale, a researcher and professor in CTAHR’s Department of Human Nutrition, Food and Animal Sciences, alongside UH student researchers.

The team discovered how the fish survive under extreme salt stress by gradually increasing tank water salinity with artificial sea salt. Several fish species, including tilapia, need the hormone prolactin to prevent excessive water uptake and ion loss in fresh water, and turn it down when entering salt water. However, in extreme hypersalinity, prolactin signaling continues to be suppressed, while a continuous shift in the types of prolactin genes being expressed takes place.

This allows the fish to fine-tune their ability to to regulate salt and water balance even during transitions into salty environments.

Read More: University of Hawaii