Glenn James

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

 

 

The latest update to this website was at 522pm Wednesday evening HST


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

0.73  Mount Waialeale, Kauai
0.39   Manoa Lyon Arboretum, Oahu
0.00  Molokai
0.00  Lanai
0.06  West Wailuaiki, Maui
0.40  Kawainui Stream, Big Island


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

18  Waimea Heights, Kauai – NE
27  Oahu Forest NWR, Oahu – ENE
35  Molokai AP, Molokai – NE
28  Lanai 1, Lanai – NE
39  Na Kula, Maui – SE 
33  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 front far northwest…thunderstorms in the deeper tropics

 

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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 52 degrees, relative humidity is 80%…with calm winds

1010am, mostly sunny here on Maui with a few popcorn cumulus cl0uds here and there

248pm, it’s cloudy and a bit cool here in upper Kula, almost feels like a shower could fall, although it remains dry at the time of this writing.

357pm, cloudy and we just had a light shower here at my place…very light.

 

Here’s the NOAA Climate Prediction Center’s Hawaii seasonal outlook: Hilo, Kahului, Honolulu and Lihue each a 75% probability of below-normal three-month rainfall totals for December 2026–February 2027

 

Hawaii’s Weather Highlights…as of Wednesday evening: Moderate to breezy trades will continue to weaken through Thursday, allowing winds to decrease to moderate levels for the remainder of the week. While mostly fair weather conditions are expected through the weekend, we will see some increases of showers at times mainly over windward and mauka areas. While details remain very uncertain, a wet pattern is expected to develop around Tuesday or Wednesday of next week.

Weather Narrative…as of Wednesday evening: Satellite imagery shows scattered cumulus clouds across the state with some passing showers riding in with moderate to locally breezy trades. As the high continues to weaken and drift eastward over the next few days, the trades will weaken to moderate speeds Thursday. Generally fair trade wind weather is expected Thursday and Friday, but some scattered showers riding in with the trade winds will be capable of producing some moderate showers mainly during the overnight and morning hours.

By the weekend, we could see some showery weather at times from two subtle weather features. A weak trough currently southeast of the Big Island is expected to drift further northward, but the northward extent remains uncertain. Depending on how far north the moisture gets, we could possibly see some heavier showers develop over windward Big Island this weekend.

The second feature is the remnants of an old frontal boundary riding in with the northeast trades and arriving over Kauai late Saturday and eventually making its way to around Oahu on Sunday. Some scattered showers should be expected, but rainfall intensity should range from light to moderate. The deeper moisture around the Big Island will be capable of producing some heavier showers Saturday afternoon into Sunday.

Beyond the weekend, the forecast remains very uncertain for next week. While confidence remains high on a wetter pattern developing around Tuesday or Wednesday of next week, the potential impacts remain very uncertain. Majority of the models show some type of low pressure system developing along a monsoon trough near west-southwest this weekend. The low is then expected to drift eastward but varies significantly on the position and intensity of the low.

While we could begin to see some unsettled weather beginning as early as late Monday, the more impactful weather will likely be closer to Tuesday or Wednesday. While the GFS model is showing moisture moving in earlier than the ECMWF model, there is some agreement in the deeper tropical moisture arriving late Tuesday into Wednesday.

Please stay tuned to the forecast as we get more information on the potential heavy rain event next week. With deep moisture (precipitable water values well above 2 inches) moving in from southwest, the threat for heavy rain and flash flooding will be possible across the state.

Fire Weather:  With the trades decreasing to moderate speeds Thursday, fire weather concerns will remain at low to moderate. Mostly dry leeward conditions will likely persist through the weekend. The subsidence temperature inversion across the state will remain in the 7,000-8,500 foot range, and will be weakening as a weak trough drifts further north, east of the state. Widespread wetting rain will be possible towards the middle of next week.

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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 evening: A surface low pressure system will move east, becoming located due north of the state by Friday, pushing the high that has brought consistent trades off to the east. This will weaken the trades from Thursday into the weekend. Weak to moderate trades should continue into early next week, but there is a chance of southeast winds Tuesday or Wednesday.

Tiny surf along north-facing shores will grow slightly and then remain steady Friday as a small northwest swell arrives. A slightly larger medium-period north-northwest swell will follow this weekend. A potential storm-force low developing north of Japan will likely send us a larger long-period west-northwest swell early next week. Surf along south-facing shores will remain small, before a series of small to moderate, south-southwesterly swells boosts surf heights to near to above seasonal average this weekend into early next week.

East-facing shores will see trade-wind swell decline as trade winds decrease, leading to a slight reduction in surf through the remainder of the week. A small, medium-period east swell forecast to arrive Thursday may help maintain east-facing surf into the weekend.

 

>>> Highest Temperature Wednesday, October 21, 2026 – 96 degrees at Coolidge, AZ


>>>
Lowest Temperature Wednesday, October 21, 2026 – 16 degrees near Bynum, MT

 

Hawaii aesthetic inspiration ideas


World-wide Tropical Cyclone Activity

 



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



Atlantic Ocean:

Subtropical cyclone Josephine…is located 585 miles southwest of Halifax, Nova Scotia 

SUBTROPICAL STORM JOSEPHINE FORMS…FORECAST TO MOVE NORTHEASTWARD AWAY FROM THE UNITED STATES

According to the NHC advisory number 1

Josephine is moving toward the north near 6 mph. The storm should turn northeastward by tomorrow with a large increase in forward speed. On the forecast track, Josephine should move away from the United States and remain south of Nova Scotia and Newfoundland. Maximum sustained winds are near 65 mph with higher gusts. Some strengthening is expected, though Josephine is anticipated to remain a subtropical storm through early Thursday. Further strengthening is likely by late Thursday as Josephine becomes a post-tropical cyclone with hurricane-force winds. Winds of 40 mph extend outward up to 415 miles from the center. The estimated minimum central pressure is 990 mb (29.24 inches).

cone graphic

 

>>> Subtropical Central Atlantic:

A trough of low pressure located several hundred miles to the east-southeast of Bermuda is producing a large area of disorganized showers and thunderstorms. Some development of this system is possible during the next day or two while it moves slowly north-northeastward. Upper-level winds are forecast to become too strong for further development by the weekend.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…10 percent


Caribbean Sea:
There are no active tropical cyclones


Gulf of America:
There are no active tropical cyclones

 

Northeast Pacific:

Tropical Cyclone 22E (Vance)…is located 730 miles south-southeast of Manzanillo, Mexico

DEPRESSION STRENGTHENS INTO TROPICAL STORM VANCE …FORECAST TO RAPIDLY INTENSIFY

According to the NHC advisory number 2

Vance is moving toward the west near 7 mph. This general motion with a turn toward the northwest then north-northwest is expected over the next few days, with a slight decrease in forward speed. Maximum sustained winds have increased to near 40 mph with higher gusts. Steady to rapid intensification is expected, and the system is forecast to become a hurricane on Friday. Tropical-storm-force winds extend outward up to 70 miles from the center. The estimated minimum central pressure is 1003 mb (29.62 inches).

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Central North Pacific: There are no active tropical cyclones

>>> Western Central Pacific:

An area of low pressure is forecast to form near the International Date Line, a few hundred miles west-southwest of Johnston Atoll late this weekend or early next week. Environmental conditions appear conducive for some gradual development thereafter while the system moves generally eastward to east-northeastward.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…30 percent

 

Northwest Pacific Ocean:

Tropical Cyclone 29W (Champi)…is located approximately 381 NM southeast of Taipei, Taiwan

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Southwest Pacific Ocean: There are no active tropical cyclones

 

North and South Indian Oceans / Arabian Sea: 

Tropical Cyclone 02S (Agueda)…is located approximately 687 NM east of Dar Es Salaam, Tanzania 

 

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



Interesting: 
University of Birmingham Tackles Laboratory Plastic Waste Through Pioneering Recycling Scheme

University of Birmingham takes steps in tackling major sustainability challenge by collecting disposable laboratory gloves for recycling.

The University of Birmingham has completed its first major collection of disposable laboratory gloves for recycling, helping to tackle one of the most persistent sources of plastic waste in scientific research and teaching.

Joining the RightCycle™ laboratory glove recycling program in 2025, the School of Chemistry and the Collaborative Teaching Laboratory are two of the first departments at Birmingham to successfully implement a waste-reducing program of this kind. Through this ongoing collaboration, uncontaminated gloves are collected and processed into new products – rather than being sent for incineration or landfill – highlighting the University’s efforts to take meaningful steps towards reducing laboratory waste.

Read More: University of Birmingham