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

 

The latest update to this website was at 515pm Monday evening HST


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

0.33  Mount Waialeale, Kauai
0.18  Kaala, Oahu
0.22  Puu Alii, Molokai
0.00  Lanai
1.13  West Wailuaiki, Maui
0.87  Honaunau, Big Island


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

22  Puu Lua, Kauai – NE
27  Oahu Forest NWR, Oahu – ENE
27  Makaulapai, Molokai – NE
30  Kealaloloa Rg, Maui – NE 
29  Kealakomo, 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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   Typhoon Nolo now in the western Pacific…Hurricane Rachel far east towards Mexico


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Variable clouds are present over the island chain 

 

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

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Localized Showers…not many 

 

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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 Monday comments:  I’m at home here in upper Kula, Maui, Hawaii

502am, it’s mostly clear here at my place, the low temperature 53 degrees, relative humidity is 77%…with calm winds

910am, a beautifully clear day with no vog here on Maui. There are some minor clouds along the windward sides, although I don’t see much if any shower activity.

 


Hawaii’s Weather Highlights…as of Monday evening: Moderate to locally breezy trades will continue to bring scattered showers to windward and mountain areas. Winds will begin to ease tonight, then turn out of the south by mid-week, as an area of low pressure develops to the north of the state. Rain chances and the potential for heavy rain will increase during the second half of the week.

Weather Narrative…as of Monday evening: Current radar and satellite imagery show scattered showers moving into windward and mauka areas of the state, on the moderate to locally breezy trades, along with clouds and showers developing along the kona slopes of the Big Island from Kailua-Kona to South Point and up to Volcano, due to daytime heating.

The high generating our trades to the northeast of the state will weaken and shift further northeast, as deep troughing develops across the region north of the state over the next couple of days. This will weaken the trade wind flow Tuesday, allowing for a hybrid lighter trade winds and land/sea breeze pattern to develop, with limited showers favoring windward and mauka areas overnight, then daytime heating will induce clouds and a few showers over leeward areas Tuesday afternoon.

Model guidance continues to indicate that the trough to the north will deepen and form a broad low both aloft and at the surface by late Wednesday into Thursday, causing the low level flow to veer out of the south across the state. With the increasing instability due to the nearby low and deep tropical moisture being carried northward in the southerly flow, the potential for heavy rain will increase beginning Wednesday and persist through at least Friday. In this flow, the heavy showers will likely favor south-facing portions of each island.

Beyond Friday, forecast confidence decreases significantly as the global model solutions diverge. However, the models lean toward bringing trades back on Saturday into Sunday for now.

Fire Weather:  Moderate to locally breezy trades will gradually ease Tuesday with RH values just above the critical threshold for fire weather during the afternoon hours. Fire weather risk then diminishes through the remainder of the week as moisture increases, winds decrease, and showers increase in coverage. The inversion should range from 6-8,000 feet through Tuesday.

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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 Monday evening: High pressure centered far northeast of Hawaii will drive moderate to fresh trade winds tonight. Winds are in the process of weakening as a low pressure system dig southward towards the state, therefore, the Small Craft Advisory has been cancelled for all waters and should remain so through the rest of the week. The low will stall north of the islands and draw moisture out of the tropics and over the area through the second half of the week, so expect an increase in showers.

A long-period south swell will increase to slightly above seasonal averages through Wednesday. Surf is then forecast to drop to near or slightly below average for the rest of the week, maintained by a mix of new, small south swells.

A long-period northwest swell will arrive on Tuesday that will continue through the end of the week even as swell energy becomes shorter period as it is reinforced by a low to the north- northwest of the Hawaiian Islands. Surf along east facing shores will diminish tonight through the rest of the week as winds weaken.

A small, long-period west swell originating from Typhoon Choi-wan is forecast to reach the islands Thursday into the weekend, which may produce moderate surf for west-facing shores.

 

>>> Highest Temperature Monday, October 5, 2026 – 110 degrees near Tecopa, CA


>>> Lowest Temperature Monday, October 5, 2026 – 22 degrees at Peter Sinks, UT

 


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


Caribbean Sea: There are no active tropical cyclones


Gulf of America: There are no active tropical cyclones

>>> Southwestern Gulf of America:

Invest 92L

A trough of low pressure over the southwestern Gulf of America is producing disorganized showers and thunderstorms. Although environmental conditions appear to be only marginally conducive, gradual development is becoming more likely, and a tropical depression is expected to form during the middle portion of the week. This system is expected to drift east-northeastward over the next couple of days, before it turns northward. It is too early to determine the specific impacts to the northern Gulf Coast, but interests there should closely monitor the progress of this system.

* Formation chance through 48 hours…high…70 percent
* Formation chance through 7 days…high…80 percent

 

Northeast Pacific

Tropical cyclone 18E (Rachel) is located about 540 miles west-southwest of the southern tip of Baja CA

RACHEL MOVING WESTWARD OVER THE OPEN EASTERN PACIFIC OCEAN

According to the NHC advisory number 36 

Rachel is moving toward the west near 9 mph and a westward to west-northwestward motion is expected for the next several days. Maximum sustained winds are near 90 mph with higher gusts. Fluctuations in strength are possible over the next day or so, with gradual weakening expected thereafter. Hurricane-force winds extend outward up to 40 miles from the center and tropical-storm-force winds extend outward up to 140 miles. The estimated minimum central pressure is 973 mb (28.74 inches).

cone graphic

 

>>> South of Southern Mexico:

Invest 92E

A broad area of low pressure located just to the south of the Gulf of Tehuantepec is producing disorganized showers and thunderstorms. Environmental conditions appear favorable for gradual development, and a tropical depression is expected to form during the middle to latter portion of the week while the system moves slowly west-northwestward to northwestward, just offshore of the southern to southwestern coast of Mexico.

* Formation chance through 48 hours…high…70 percent
* Formation chance through 7 days…high…90 percent

 

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 15E (Nolo) is located about 522 NM northeast of Wake Island

https://www.metoc.navy.mil/jtwc/products/ep1526.gif

 

Tropical Cyclone 26W(Choi-Wan)…is located approximately 384 NM northeast of Iwo To 

https://www.metoc.navy.mil/jtwc/products/wp2626.gif

 

Tropical Cyclone 27W(Koguma)…is located approximately 256 NM north of Kwajalein

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

 

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:  In Alaska, Soil in Permafrost Regions is Warming the Fastest

Soils are warming quickly and at considerable depth across Alaska, with temperatures rising fastest in the state’s permafrost region, a trend that could accelerate climate change and undermine the stability of roads, buildings and other infrastructure built on the continuously frozen ground.

That’s a central finding of new research from Washington State University that provides a comprehensive look at soil temperatures from 1997 to 2023 in a state where the effects of climate change are pronounced. The warming permafrost comes with particular concern, because when that ground thaws it releases carbon dioxide and methane, driving even faster warming.

Alaska’s air temperatures are rising at twice the pace of the Lower 48, a key sign of the “polar amplification” of climate change at the Arctic latitudes. The new research details how and where the ground is warming, compares that to air temperatures, and shows that snow cover plays a key role in regional differences.

Read More at: Washington State University