Glenn James

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

 

The latest update to this website was at 644am Tuesday morning HST


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

0.01  Puu Lua, Kauai
0.29  Punaluu Stream, Oahu
0.03  Kamalo, Molokai
0.00  Lanai
0.70  Na Kula, Maui
1.96  Pahoa, Big Island


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

12  Puu Lua, Kauai – NE
18  Kii, Oahu – E
28  Makapulapai, Molokai – E
31  Na Kula, Maui – NNE
20  Upolu AP, Big Island – E


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.


https://weather.gc.ca/data/satellite/goes_gwdisk11_1070_100.jpg

Big Blue…click twice for largest version

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/tpw/13/GOES18-TPW-13-900x540.gif

Thunderstorms far south in the deeper tropics


https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20262860750-20262861540-GOES18-ABI-HI-14-600x600.gif

Clear to variable cloudy over the island chain 

 

https://radar.weather.gov/ridge/standard/HAWAII_loop.gif

https://radar.weather.gov/ridge/standard/PHKI_loop.gif

https://radar.weather.gov/ridge/standard/PHKM_loop.gif

Localized Showers 

 

https://www.weather.gov/wwamap/png/hfo.png

Please open this link to see details on any current Watches, Warnings and Advisories noted above




~~~
Hawaii Weather Narrative
~~~

 

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

 

Hawaii’s Weather Highlights…as of Tuesday morning: Moderate trades will build back into the area today. A weak trough near the Big Island is producing showers and clouds over the eastern end of the island chain. As this trough weakens and moves westward, expect showers to trend down by tonight. Elsewhere, drier conditions will prevail. Trade winds are anticipated to become breezy by the end of the week, as high pressure strengthens north of the state. Slightly wetter trades will be possible this coming weekend.

Weather Narrative…as of Tuesday morning: A surface trough is located over the eastern side of the Big Island. Showers and widespread cloud cover associated with this trough have been moving over Big Island windward locations throughout the night, and will continue through the morning. Several locations across the Big Island have picked up over an inch of rain, with a couple of spots receiving over an inch and a half in the past 24 hours.

With that being said, radar estimated rainfall rates have been steadily in the light to moderate range, precluding any flooding concerns at this time. To a lesser extent, some of the moisture associated with this weak trough has spread to portions of Maui as well. Elsewhere across the state, drier air remains in place with fewer clouds and showers occurring.

The trough will weaken as it moves westward, while a low aloft moves off to the east. Prevailing clouds and showers associated with the trough will diminish later this morning, but lingering moisture nearby may enhance afternoon clouds and shower activity over the Big Island interior.

Moderate trade winds will be building back into our area, and may become locally breezy within typically windy areas by this afternoon. A few passing showers will be possible for the smaller islands today, mainly favoring windward and mauka locations.

By mid-week, conditions will become drier, as the features noted above will have moved well away from the islands. Trade winds are then expected to increase Thursday into the weekend, as high pressure to the north becomes established and strengthens. As trade winds increase, passing showers will favor windward and mountain areas, and could increase slightly this coming weekend.

Fire Weather:  Moderate trade winds will continue through the first half of the week. Dry air will keep RH levels near-critical values each afternoon for parts of the state over the next several days, but winds will be a limiting factor. Inversion heights will range from near 5,000 feet over the western end of the state, to around 12,000 feet over the eastern end. Winds will increase during the second half of the week, although moisture levels are also expected to increase a bit.

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 Tuesday morning: Gentle to moderate trade winds will persist through Wednesday as as a surface ridge remains anchored far northeast of the state, and a weak trough dissipates near the Big Island. Trades will strengthen to moderate to locally fresh levels Thursday, as surface high pressure builds far north of the state. Trades will further strengthen to fresh to locally strong late Friday through the weekend, and a Small Craft Advisory (SCA) will likely be needed for the typically windy waters around Big Island and Maui.

A fresh, long period northwest swell will build today, pushing surf along north and west facing shores to near seasonal averages through Wednesday. This swell will decline Thursday and 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.

South shore surf will remain elevated through Wednesday as a long period south-southwest swell slowly declines. Another long period south swell will help produce surf near seasonal average Thursday into early in the 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 Monday, October 12, 2026 – 102 degrees at Rio Grande Village, TX


>>>
Lowest Temperature Monday, October 12, 2026 – 12 degrees near Kirk, 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

>>> Eastern Tropical Atlantic:

A low pressure trough located several hundred miles west-northwest of the Cabo Verde Islands continues to produce a large area of disorganized showers and thunderstorms. Further development of this system is no longer expected as the low moves slowly northward to north-northwestward within an area of strong upper-level winds.

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


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 210 miles south-southwest of Mazatlan, Mexico

SMALL SIMON FORECAST TO MOVE SLOWLY OVER THE NEXT DAY OR TWO …INTERESTS IN WEST-CENTRAL MEXICO AND BAJA CALIFORNIA SUR SHOULD CONTINUE TO MONITOR FORECAST UPDATES

According to the NHC advisory number 25 

Simon is moving toward the west near 2 mph. The hurricane is forecast to move very slowly over the next couple of days, followed by an eventual turn to the north by late this week. Maximum sustained winds are near 90 mph with higher gusts. Fluctuations in intensity are likely over the next few days, but Simon is forecast to remain a hurricane through midweek. Hurricane-force winds extend outward up to 10 miles from the center and tropical-storm-force winds extend outward up to 45 miles. The estimated minimum central pressure is 977 mb (28.85 inches).

cone graphic

 

Tropical cyclone 21E is located about 820 miles southeast of Manzanillo, Mexico

TROPICAL DEPRESSION TWENTY-ONE-E FORMS OFF THE COAST OF SOUTHERN MEXICO …FORECAST TO RAPIDLY INTENSIFY TO A MAJOR HURRICANE OVER THE NEXT FEW DAYS

According to the NHC advisory number 1 

The depression 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 35 mph with higher gusts. Rapid intensification is forecast during the next 3 days, and the cyclone is expected to become a hurricane by Wednesday night and a major hurricane by Friday. The estimated minimum central pressure is 1006 mb (29.71 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 704 NM east-southeast of Misawa, Japan

https://www.metoc.navy.mil/jtwc/products/wp2726.gif

 

Tropical Cyclone 28W…is located approximately 253 NM north of Saipan 

https://www.metoc.navy.mil/jtwc/products/wp2826.gif

 

Southwest Pacific Ocean: There are no active tropical cyclones

North and South Indian Oceans / Arabian Sea: There are no active tropical cyclones

 

https://www.metoc.navy.mil/jtwc/products/abpwsair.jpg

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