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

 

The latest update to this website was at 525am Monday morning HST


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

0.47  Mount Waialeale, Kauai
0.18  Kaala, Oahu
0.15  Puu Alii, Molokai
0.00  Lanai
0.98  West Wailuaiki, Maui
0.74  Honaunau, Big Island


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

18  Puu Lua, Kauai – NE
29  Kuaokala, Oahu – NE
24  Anapuka, Molokai – NE
32  Kealaloloa Rg, Maui – NE 
30  Lalamilo, 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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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

 


Hawaii’s Weather Highlights…as of Monday morning: Dry, stable, breezy trades will continue through today, bringing limited showers mainly along windward and mauka areas. Winds will begin to ease later today through Tuesday. A developing area of low pressure north of the state, will further weaken winds and turn them out of the south Wednesday. Chances of showers will increase during the second half of the week, as well as the potential for heavy rain across Hawaii.

Weather Narrative…as of Monday morning: Latest surface analysis shows high pressure north of the state and a weak disturbance passing to the south, resulting in breezy trade winds. Radar and satellite imagery show scattered low clouds with embedded light showers. Overnight rainfall totals range from .20 to .30 inches of rainfall, mostly for windward and mauka areas of Maui County and the Big Island. Modest amounts were observed over the the rest of the state, as shower coverage becomes more isolated. Chances of showers will trend down through the day today. Winds will gradually ease later today and tonight, as the high north of the state weakens and shifts northeast. Showers will remain limited along windward and mauka areas.

A hybrid land/seabreeze and light trade wind pattern will develop Tuesday as winds continue to ease. Winds will then veer southeasterly by late Tuesday, and south by Wednesday, as a trough approaches from the northwest. A surface low will form along the trough and southerly winds will draw deep tropical moisture over the islands, while a cold pool aloft associated with the upper low, will act to destabilize the atmosphere over the state. Precipitable water values will increase to around 2 inches and dew points will rise to around 70 Thursday and into the lower 70’s Friday.

As this deeper moisture moves in with increasing instability, heavy rain will become likely. The timing and location of the moisture continues to be depicted slightly different in the long range models, but at this time it appears all the islands will be impacted at some point. Thus it seems wise to not get too specific in the forecast details for now, although look an overall wetter pattern and southerly winds from around late Wednesday through at least Friday, and possibly lingering into the upcoming weekend.

Fire Weather:  Breezy trades will gradually ease later today into Tuesday, with RH values just above the critical threshold for fire weather each afternoon through Tuesday. 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 7-8,000 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 morning: High pressure north of the Hawaiian Islands will maintain fresh to locally strong trade winds today. The Small Craft Advisory for the windier waters and channels around Maui County and the Big Island remains in effect through this afternoon. Thereafter, high pressure to the north weakens and trades will start to diminish. Troughing developing northwest of the islands will likely cause winds to veer out of the southeast around mid-week and bring increased shower activity for the latter half of the week.

A new small, long-period south swell will slowly fill in today and tonight, causing surf along south and west facing shores to increase to slightly above seasonal averages Tuesday into 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 small, medium-period northwest swell builds this morning and peaks late today, producing a small bump in surf along north-facing shores that begins fading on Tuesday. However, a larger, long-period northwest swell will arrive on Tuesday that will push surf higher into Wednesday. Surf is then likely to hold 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 fall below seasonal averages as locally strong trades diminish tonight.

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 of the Big Island.

 

>>> Highest Temperature Sunday, October 4, 2026 – 110 degrees at Death Valley, CA


>>> Lowest Temperature Sunday, October 4, 2026 – 19 degrees near Bynum, MT

 


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:

A trough of low pressure in the southwestern Gulf of America is producing disorganized showers and thunderstorms. Although environmental conditions appear to be marginally conducive, gradual development is becoming more likely, and a tropical depression is likely to form during the middle or latter portion of the week. This system is expected to drift eastward over the next few days, before it turns northward.

* Formation chance through 48 hours…low…30 percent
* Formation chance through 7 days…high…70 percent

 

Northeast Pacific

Tropical cyclone 18E (Rachel) is located about 440 miles west-southwest of the southern tip of Baja CA

RACHEL SLIGHTLY WEAKENS AND CONTINUES WESTWARD

According to the NHC advisory number 34 

Rachel is moving toward the west near 7 mph and a continued westward to west-northwestward motion is expected for the next several days. Maximum sustained winds are near 85 mph with higher gusts. Fluctuations in strength are possible over the next few days, with gradual weakening beginning by the mid part of the week. 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 976 mb (28.82 inches).

cone graphic

 

>>> South of Southern Mexico:

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…medium…50 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 961 NM northwest of Johnston Islan

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Tropical Cyclone 26W(Choi-Wan)…is located approximately 290 NM east-northeast of Iwo To 

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Tropical Cyclone 27W(Koguma)…is located approximately 168 NM north of Kwajalein

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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:  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