Glenn James

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

 

The latest update to this website was at 1235pm Sunday afternoon HST


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

2.58  Mount Waialeale, Kauai
0.05  Kahuku TA, Oahu
0.00  Molokai
0.00  Lanai
0.03  Kula AG, Maui
0.49  Kealakekua, Big Island


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

18  Port Allen, Kauai – SE
18  Oahu Forest NWR, Oahu – ENE
21  Molokai AP, Molokai – NE
27  Summit, Maui – NNE
22  Kealakomo, 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.


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Big Blue…click twice for largest version

 

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A low pressure system to the northwest


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Clear to variable cloudy over the island chain 

 

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

436am, it’s clear here at my place, the low temperature was a cool 51.5 degrees, relative humidity is a very dry 53%…with calm winds

1112am, very sunny, what I’d call a pristine early autumn day here in the tropics.

 

Interesting Weather Blog: Mauka Showers…Beware of Tropical Cyclone Tails!

 

Hawaii’s Weather Highlights…as of Sunday afternoon:  Moisture will decrease through Monday. Light to moderate trade winds will prevail, allowing sea breezes to develop in sheltered leeward areas. A brief increase in showers is expected Monday night, mainly on the Big Island, before we return to relatively dry trades through the end of the week. Wind speeds are forecast to increase from Friday into next weekend.

Short Term Update: Mostly sunny skies are observed across Oahu, Maui County, and most of the Big Island with the exception of the Kau District. For Kauai, some lingering clouds associated with a trough nearby remain, though recent satellite trends do show some breaks in the clouds since sunrise. Showers and moisture associated with the trough have moved off to the west, remaining in the coastal waters west of Niihau.

With light winds across the area, expect afternoon sea breezes to increase clouds over sheltered leeward and interior locations. However, not anticipating much in the way of rainfall today, as drier air settles over the region.

Weather Narrative…as of Sunday afternoon:  Satellite showed mostly cloudy skies over Kauai County and the Big Island, and clear to partly cloudy skies elsewhere. Radar indicated isolated showers over Kauai County, with a larger area of showers to their south and west. Winds were generally out of the east at 5 to 10 mph.

A weak upper level low just to the east of the Big Island will weaken further and then move off to the northeast over the next few days. This will have virtually no impact at the surface, apart from some shade from increased cloudiness. Trade winds will continue to build back in, initially from the east, then becoming northeast and strengthening late this coming week.

Winds are expected to be light enough for sea-breezes to develop in some areas again today, leading to an increased chance of showers in leeward areas.

We will see an increase in the chance of showers Monday night into Tuesday, as an area of enhanced moisture moves in from the east. This moisture will be most pronounced near the Big Island, but will impact the windward areas of all islands.

Fire Weather:  Light to moderate trades will be with us into the middle of the coming week. Moisture will decrease today through Monday, bringing RH values down to near critical values on parts of the Big Island Monday, including near Kona. However, winds will too be light for any fire weather problems. Inversion heights are around 5,500-6,500 feet across the eastern end of the state.

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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 afternoon: Moderate to fresh trade winds continue, though weaker winds will remain in place over the western waters as a trough lingers west of the area. Trade winds then decrease this upcoming week into the light to moderate range through much of the week, with slight day to day fluctuations. Strengthening trades are possible towards the end of the week, as high pressure builds north of the area.

A long-period south swell will peak today and hold through Monday, producing elevated surf along south and west-facing shores, but it will remain below advisory levels. South shore surf will decline gradually Tuesday into Wednesday, but a new long-period south swell arriving late Wednesday, will provide another rise in surf for Thursday and Friday.

The short-period north-northwest swell generated by low pressure to the northwest of the islands will fade today, while a new small, long-period swell peaks. This will keep small surf continuing today for north-facing shores, but surf declines on Monday as this swell fades. Another small, long-period northwest swell is forecast to arrive on Monday and peak Tuesday, which will boost north shore surf back to moderate levels. A moderate north-northwest swell is possible by the end of the week, depending on the evolution of a projected low in the north Pacific. However, confidence is low given differences in model solutions with this feature.

Surf along east-facing shores will remain small as local winds remain fairly weak, with only slight variations each day. Small, moderate-period west and east swells, generated by multiple Pacific tropical cyclones, continue to move across the islands through Monday.

 

>>> Highest Temperature Saturday, October 10, 2026 – 98 degrees at Needles, CA


>>>
Lowest Temperature Saturday, October 10, 2026 – 18 degrees at Mount Washington, NH

 

Beach Landscapes. ocean meets the forest Hawaiian inspired. free to use


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:

Post-Tropical Cyclone 09L (Isaias)…is located about 180 miles northeast of Nashville, Tennessee – Last Advisory

FLASH FLOOD THREAT FROM ISAIAS IS DECREASING BUT SOME RISK CONTINUES TODAY ACROSS PORTIONS OF THE APPALACHIANS AND MID-ATLANTIC

According to the NHC advisory number 20 

The post-tropical cyclone is moving toward the east-northeast near 22 mph and this motion is expected to continue today before the low dissipates over West Virginia this evening. Maximum sustained winds are near 25 mph with higher gusts. Little change in strength is forecast during the next 12 hours, with the low dissipating thereafter. The estimated minimum central pressure is 1010 mb (29.83 inches).

cone graphic

 

Northeast Pacific

Post-Tropical cyclone 18E (Rachel) is located about 255 miles north-northeast of San Diego, CA – Final Advisory

REMNANTS OF RACHEL BRINGING HEAVY RAINS AND GUSTY WINDS TO PORTIONS OF THE SOUTHWESTERN UNITED STATES

According to the NHC advisory number 58 

The remnants are moving toward the north-northeast near 29 mph. Maximum sustained winds are near 35 mph with higher gusts. The estimated minimum central pressure is 994 mb (29.36 inches).

cone graphic

 

Tropical cyclone (Simon) is located about 105 miles west-northwest of Manzanillo, Mexico

CORE OF HURRICANE SIMON CONTINUES TO SKIRT THE COAST OF WEST-CENTRAL MEXICO WITH HURRICANE CONDITIONS LIKELY OCCURRING…NEW HURRICANE WATCHES ISSUED FARTHER UP THE MEXICAN COAST

According to the NHC advisory number 18 

Simon is moving toward the north-northwest near 6 mph and this general motion is expected to continue over the next couple of days with a gradual turn to the north and north-northeast on Tuesday into Wednesday. On the forecast track, Simon is expected to pass near the coast of west-central Mexico this afternoon and evening before moving a little farther away on Monday. Simon is then forecast to turn back towards the coast of Mexico on Wednesday. Maximum sustained winds have decreased to near 130 mph with higher gusts. Simon is a category 4 hurricane on the Saffir-Simpson Hurricane Wind Scale. Additional weakening is forecast but Simon is still expected to be a strong hurricane as it passes near the coast of west-central Mexico this afternoon and evening. Simon is now expected to remain a hurricane when it moves farther offshore again on Monday and Tuesday. Hurricane-force winds extend outward up to 25 miles from the center and tropical-storm-force winds extend outward up to 60 miles (95 km). The estimated minimum central pressure is 947 mb (27.97 inches).

 

>>> South of southern Mexico:

A tropical wave over the far eastern East Pacific is producing disorganized showers and thunderstorms. Environmental conditions are expected to be conducive for gradual development, and a tropical depression is expected to form well south of southern Mexico by the middle or latter half of the week as the system moves generally west-northwestward at around 10 mph.

* Formation chance through 48 hours…low…30 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 27W (Koguma)…is located approximately 627 NM southeast of Yokosuka, Jpan

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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: 
Warning on Quality of Rainwater

Rainwater tanks are a popular way for Australians to save water, but new research has found they can also harbour potentially harmful bacteria and metals that could pose health concerns.

Researchers from Adelaide University and Flinders University tested rainwater from 100 household tanks across Adelaide and the Adelaide Hills, finding bacteria linked to gastroenteritis and other infections in a number of tanks.

The study found Campylobacter bacteria in 13% of tanks, Salmonella in 10%, Shigella in 3% (all linked to gastroenteritis) and Pseudomonas aeruginosa (which causes other infections) in 12%. Bacteria were also detected in tanks used for drinking water.

Read More: Flanders University