Glenn James
Hawaii Weather Today
Creator, Author, and Administrator for 30 years

 

The latest update to this website was at 1056am Sunday morning HST


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

0.09  Kilohana, Kauai 
0.03  Manoa Lyon Arboretum, Oahu
0.01  Kamalo, Molokai
0.00  Lanai
0.01  West Wailuaiki, Maui
0.52  Glenwood, Big Island


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

09  Port Allen, Kauai – NE
21  Oahu Forest NWR, Oahu – ENE
15  Makapulapai, Molokai – SE 
22  Kealaloloa Rg, Maui – NNE
20  Kealakomo, Big Island – NNE


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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  Tropical Storm 14E (Norbert) is moving westward…steadily weakening (no wind threat to Hawaii, although there could be locally heavy rain later in the upcoming week)


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Variable clouds across the state…and over the offshore waters 

 

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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




~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Sunday comments:  I’m at home here in upper Kula, Maui, Hawaii

453am, it’s clear here at my place. My low temperature here in upper Kula was 54 degrees, relative humidity 82%…and calm winds

 

Interesting weather blog: Mauka Showers…Hurricane Lala Rainfall Analysis – It’s About the Intensity

 

Wondering whether this autumn and winter will be drier or wetter than normal here in Hawaii? Well, it looks like it could be markedly drier than normal. This doesn’t mean that there won’t be any cold fronts or upper level lows, that will bring some good moisture, just fewer than we’d likely prefer.

 

Tropical Storm 14E (Norbert) remains active far east-southeast 

cone graphic

time of arrival graphic

 

Hawaii’s Weather Highlights…as of Sunday morning:  Drier trade winds will prevail early this week, with light showers on the windward sides of the islands. Low level convergence along a surface trough, will bring a modest increase in clouds and showers late Monday into Tuesday. More rain is expected through the second half of the week, as remnants of Tropical Storm Norbert pass through the region.

Short Term Update: Skies were mostly to partly sunny, except for windward Big Island and northeast Maui. Winds were averaging 5 to 15 mph with a few spots gusting to near 20 mph. These relatively light trade winds are expected to continue through the day, with only isolated light showers forecast.

Weather Narrative…as of Sunday morning: A broad upper level low currently northeast of the islands, is forecast to track westward over the next several days. Moisture associated with a disturbance may be pulled northward into the eastern half of the state, as both it and the trough move westward. Low level convergence will bring a modest increase in clouds and showers late Monday into Tuesday, initially reaching the Big Island with showers becoming more diffuse as the trough moves west.

Tropical Storm Norbert is currently far east of Hilo, moving west at 12 mph. This system is forecast to continue to move westward, weakening to a tropical depression by Tuesday morning, and becoming post-tropical later that day. Trade winds will strengthen as the residual trough of Norbert passes Thursday into Friday. Rainfall will also increase east to west across the state from Wednesday night through Friday night. Large-scale forcing from an upper trough over the region, and forecast precipitable water near 2.00″ will increase the flooding risk, especially for areas where the soil is still saturated from recent heavy rainfall.

Fire Weather:  Fire weather risk will remain low the next several days due light to moderate winds and the effects of recent rainfall. Inversion heights are expected to remain elevated or weak through Monday. Moisture increases for the middle to latter part of the week, with a bump in the trade winds as remnants from Tropical Storm Norbert potentially approach the area.

 

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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 Sunday morning: Moderate to locally fresh trades will continue, before gradually strengthening through the latter half of the week. Moisture associated with a weak trough moving in on the trade wind flow may bring a slight increase in shower activity to the coastal waters Tuesday into Wednesday. While the current forecast has Tropical Storm Norbert dissipating before it nears the Hawaiian coastal waters from the east, remnant moisture from this system is expected to arrive potentially by Thursday, likely bringing more showers.

Surf along south-facing shores will gradually decline through Monday as the small, medium-period energy slowly fades. A series of long-period swells are expected during the second half of the week. The first pulse will gradually fill in Tuesday into Wednesday out of the southwest, followed by larger south-southwest swells Friday into next weekend. Surf could get near advisory thresholds then, but at this time it looks like it would peak just below advisory thresholds.

A small short-period northeast swell has filled in, and will peak today and fade on Monday. Surf along east-facing shores should see an increase during the second half of the week, as the trades strengthen and the remnants of Norbert moves through the islands. Some small energy is expected along northern exposures today from the northeast swell, but otherwise flat to tiny surf along north facing shores is expected through the forecast period.

 

>>> Highest Temperature Saturday, September 12, 2026 – 115 degrees at Death Valley, CA


>>> Lowest Temperature Saturday, September 12, 2026 – 23 degrees near Kirk, OR

 

Hawaii aesthetic green | Hawaii in the summer, Tropical paradise aesthetic, Hawaii scenery


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

>>> Central Subtropical Atlantic:

Disorganized showers and thunderstorms continue in association with a trough of low pressure over the central Subtropical Atlantic.

While the environmental conditions are not currently favorable for development due to strong upper-level winds, the system is expected to move into a more favorable environment for some gradual development by the middle to later portion of this week.

The disturbance is forecast to move west-northwestward across the central part of the Subtropical Atlantic.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…20 percent 


Caribbean Sea: There are no active tropical cyclones


Gulf of America: There are no active tropical cyclones

 

 Northeast Pacific:

Tropical Cyclone 14E (Norbert)…is located about 1375 miles east of Hilo, Hawaii

NORBERT WEAKENS SLIGHTLY AS IT ADVANCES WEST-NORTHWESTWARD OVER THE EASTERN PACIFIC

According to the NHC advisory number 17…

Norbert is moving toward the west-northwest near 13 mph, and a west-northwestward to westward motion is expected during the next few days. Maximum sustained winds have decreased to near 45 mph with higher gusts. Some fluctuations in intensity remain possible for the rest of the day, followed by a gradual weakening trend after that. Tropical-storm-force winds extend outward up to 105 miles from the center. The estimated minimum central pressure is 1002 mb (29.59 inches).

cone graphic

time of arrival graphic

 

>>> Central and Western East Pacific

Invest 97E

Showers and thunderstorms associated with a low pressure area located several hundred miles southwest of the southern tip of the Baja Peninsula have become better organized and more persistent today. If these development trends continue, a tropical depression or storm is likely to form later today or tonight while the system moves generally westward.

* Formation chance through 48 hours…high…90 percent
* Formation chance through 7 days…high…90 percent

 

Central North Pacific: There are no active tropical cyclones

 

Northwest Pacific Ocean: There are no active tropical cyclones

>>> There’s an area of disturbed weather being referred to as Invest 90W, which is located approximately 386 NM northeast of Chuuk

 

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:  The Breakdown of Natural Systems Could Intensify Warming by 30 Percent

As the planet heats up, tundras are thawing, wetlands are fermenting, and forests are succumbing to larger and more frequent wildfires. The breakdown of these natural systems is unleashing huge volumes of emissions, further intensifying warming from the burning of fossil fuels. According to new research, such feedback loops could amplify human-driven warming by 20 to 30 percent.

Even if humans reach net zero emissions later this century, feedbacks would add another 0.2 degrees C of warming, according to the modeling study, published this week in Environmental Research Letters. And if the world fails to reach net zero, and countries continue to produce some residual emissions through the end of this century, the added warming would be closer to 0.4 degrees C.

The world is already 1.4 degrees C hotter than in the preindustrial era, and fossil fuel emissions continue to grow, putting the Earth on course to surpass 2.5 degrees C of warming this century, scientists say, well in breach of international climate targets. And yet, while the added warming from feedback loops will further hasten the rise in temperatures, emissions from the breakdown of natural systems are largely absent from the most influential climate models, those that inform climate negotiations.

Read More: Yale Environment 360