Glenn James

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

 

The latest update to this website was at 820pm Friday evening HST


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

0.65  Kilohana, Kauai
0.56  Manoa Lyon Arboretum, Oahu
0.92  Puu Alii, Molokai
0.00  Lanai
3.87  Puu Kukui, Maui
1.06  Honolii Stream, Big Island


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

29  Lihue, Kauai – NE
36  Kuaokala, Oahu – NNE
30  Makapulapai, Molokai – E
30  Lanai 1, Lanai – NE
44  Na Kula, Maui – ESE
43  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 southwest in the deeper tropics


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Clear to variable cloudy over the island chain…showers arriving on the trades 

 

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Localized Showers…some heavy 

 

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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.

230pm, very little change in the weather since this morning.

330pm, it just got quickly cloudy here at my place, and it showered with big drops, although it backed off as quickly as it started.

5pm, cloudy and wet here in upper Kula, and it looks even wetter over on the windward side…into part of the central valley

6pm, cloudy and wet here at my place, with showery weather along the windward sides too

 

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

 

Hawaii’s Weather Highlights…as of Friday evening: 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.

Weather Narrative…as of Friday evening: Radar and satellite imagery show scattered showers moving into mainly windward and mauka areas of the state, with shower coverage increasing over the eastern half of the state, as a plume of deeper moisture moves in on the trade wind flow. This increase in windward shower activity will work its way up the island chain and persist into the evening hours, before drier air fills in on Saturday.

Surface high pressure to the north will build through the weekend and strengthen the trade wind flow to breezy levels through early next week. Additional batches of increased moisture will continue to filter in on the trades over the next several days, bringing brief increases in windward and mauka shower activity, particularly during the overnight to early morning hours. Overall, 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.

Both aloft and at the surface, broad and weak troughing will gradually develop over the Central Pacific by mid-week, weakening the pressure gradient and therefore decreasing the trade wind speeds. Otherwise, periodic showers will continue to filter into windward and mauka areas on the weakening trade wind flow.

By next weekend, models are hinting at more substantial instability developing aloft, and a larger area of deep tropical moisture being drawn up from the southeast, possibly leading to the potential for widespread heavy showers. However, the window with the greatest potential for any impacts is beyond the current forecast period, and with the model discrepancies that far out, forecast confidence is on the lower side just yet.

Fire Weather:  Surface high pressure far north of the islands will produce moderate to breezy trade winds for the next few days, with gradual strengthening expected through early next week. Between batches of showers rolling through on the trades, RH levels may approach critical fire threshold ranges, particularly Saturday afternoon. Otherwise, RH levels should help to maintain low to moderate fire weather concerns. Inversion heights should increase to around 10,000 feet through tonight, as the current batch of deeper moisture rolls through, then drop to 5,000 to 7,000 feet on Saturday.

https://www.weather.gov/images/hfo/graphics/npac.gif


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 evening: Surface high pressure far north of the islands will strengthen as it drifts eastward through Saturday. Reinforcing high pressure will build far north of Hawaii on Sunday and will settle far northeast of the islands through early next week. Fresh to strong trade winds will prevail during this time, and the Small Craft Advisory (SCA) for the typically windy waters around Big Island and Maui may need to be expanded to additional waters this weekend. Trades are expected to ease slightly by Wednesday.

A medium-period north-northwest swell will peak , producing north shore surf around seasonal average. This swell has been slow to arrive, and will slowly decline and shift more northerly during weekend, as a smaller overlapping northwest swell moves through the area. Both swells will lower on Monday and fade on Tuesday. Another small northwest swell is possible next Thursday or Friday.

Long period south swell will peak tonight, producing south shore surf slightly above seasonal average. This swell will gradually decline this weekend, and surf along south-facing shores will be below average through the coming work week.

Surf along east-facing shores will gradually increase over the next couple of days as trade winds strengthen over the region. In addition, expect some wrapping north-northwest swell to reach exposed areas through at least Saturday. Rough trade wind swell will produce east shore surf above seasonal average Sunday through Tuesday, followed by a decline Wednesday.

 

>>> Highest Temperature Friday, October 16, 2026 – 99 degrees at Los Angeles, CA


>>>
Lowest Temperature Friday, October 16, 2026 – 11 degrees at Foxpark, WY

 

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 290 miles south-southeast of Manzanillo, Mexico

TRUDY STRENGTHENS SLIGHTLY…TRUDY FORECAST TO APPROACH THE SOUTHWESTERN AND WEST-CENTRAL COAST OF MEXICO THIS WEEKEND

According to the NHC advisory number 15 

Trudy is moving toward the north near 7 mph. A turn toward the north-northwest and then northwest at a faster forward speed is expected overnight and into Saturday. This general motion is forecast to continue 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. Maximum sustained winds have increased to near 90 mph with higher gusts. Steady strengthening is possible through Saturday. Hurricane-force winds extend outward up to 30 miles from the center and tropical-storm-force winds extend outward up to 140 miles. The estimated minimum central pressure is 979 mb (28.91 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 230 NM east-southeast of Andersen AFB                                                                                                   

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Tropical Cyclone 01P…is located approximately 437 NM east-northeast of Pago Pago

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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