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

 

The latest update to this website was at 530am Monday morning HST


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

0.69  Mount Waialeale, Kauai
2.14  Lyon, Oahu
0.52  Puu Alii, Molokai
0.45  Lanai City, Lanai
1.15  Puu Kukui, Maui
1.31  Kawainui Stream, Big Island


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

14  Nawiliwili, Kauai – NE
22  Kuaokala, Oahu – NE
18  Makapulapai, Molokai – ESE
27  Lanai 1, Lanai – NE
33  Kealaloloa Rg, Maui – NE
32  Kealakomo, Big Island – NW 


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.

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

Big Blue…click twice for largest version

 

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Cold front northwest…thunderstorms far southeast (Tropical Disturbance…no threat to Hawaii)

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20261660630-20261661420-GOES18-ABI-HI-14-600x600.gif

Variable low clouds 

 

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

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

It’s it’s mostly clear, with calm winds at my place, and with a low temperature of 50 degrees and the relative humidity is 85%

 

>>> Highest Temperature Sunday, June 14, 2026 – 117 at Death Valley, CA
>>> Lowest Temperature Monday, June 15, 2026 – 23 degrees at Peter Sinks, UT

 

>>> Interesting Web Blog: Mauka Showers…Central North Pacific Tropical Cyclone Tracks in Strong El Niños, Part 2 – The Late Bloomer Years

 

Hawaii’s Broad Brush Weather Overview…as of Monday morning: Surface high pressure centered northeast of the state, will continue to generate moderate to locally breezy trades across the islands today. There will be a decrease in cloud and shower coverage as the day progresses, as a drier and more stable airmass moves in. Expect little change in the weather pattern on Tuesday, though trades will be slightly weaker.

Wednesday into Thursday, light easterly wind flow will lead to a sea breeze and land breeze regimen. Thus, most cloud cover and shower activity will be limited to interior and mountainous terrain during the afternoons. In addition, deeper moisture moving in from the southeast Wednesday through Friday, should bring increased precipitation chances to the Big Island, and perhaps Maui.

Weather Details for the Hawaiian Islands…as of Monday morning: Satellite loop and radar imagery continued to show a band of low clouds and scattered showers pushing westward over the island chain. Rainfall amounts have not been all that impressive, with windward sites on all islands picking up less than a quarter inch of rainfall accumulation. On Oahu, the cloud layer was deep enough to spill over the Koolau range and onto leeward locations, though only a few hundredths of an inch were reported.

A 1025 millibar high, centered roughly 1,600 miles northeast of the state, will remain parked in place through late today, and allow moderate to locally breezy trades to linger. Cloud cover and showers should gradually dwindle through the day as these trades help usher in a drier airmass. As stability aloft increases, a model cross-section shows the boundary layer temperature inversion height, or capping inversion, lowering to 5,000 to 6,000 feet. A few isolated showers may affect windward locations late today through tonight night, but nothing of significance. Tuesday`s weather will be very similar to today`s, though the aforementioned high lifts further north, away from Hawaii, leading to slightly weaker trades.

On Wednesday, an upper level trough begins to dig southward over the central north Pacific, along with the development of a surface frontal boundary northwest of the state. This should help weaken local pressure gradients further and bring light and variable background flow. For the smaller islands, diurnal heating, combined with weak surface flow, will lead to a diurnal sea breezes and nocturnal land breezes. Clouds and showers should mainly be limited to over the island interiors and mountainous terrain.

Meanwhile, by late Wednesday, both the GFS and ECMWF models have been consistent with carrying a pocket of deeper moisture, associated with a weak surface trough, up from the southeast towards the Big Island. This feature could act to increase shower coverage, especially along eastern portions of the Big Island. The exact timing and and impacts, if any, from this potential increase in rainfall will be refined in the coming days. Long range models continue to push this band of moisture up through Maui County and to a lesser extent Oahu on Thursday into Friday, before lifting it northward. Light southeast flow, combined with this batch of moisture, could lead to an increase in shower activity over the islands interiors during the afternoons. Typical June trade wind weather should return by the weekend.

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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 Environmental Conditions…as of Monday morning: Moderate trade winds today will become light to moderate with local land and sea breezes through the week as high pressure weakens.

The large long period south-southwest swell will hold around warning levels today, and a High Surf Warning is in place through tonight. Buoy 51002 readings are hovering around 4 to 6 feet at 17 to 19 seconds. As the period has dropped slightly from yesterday, the consistency of the sets could increase, which could lead to more water accumulating near the shorelines. The surf will then gradually lower Tuesday and Wednesday, then another pulse arrives Wednesday night into Thursday, which could push surf back up to advisory levels. The large south-southwest swell combined with King Tides will continue to create the potential for significant wave run up along south and west facing shores through the afternoon.

Very little swell energy is arriving along north facing shores, keeping surf tiny to flat. A small bump in surf is possible for north- facing shores by late Tuesday into Wednesday, with the arrival of a small northwest swell and a smaller north swell. Gentle to moderate east-northeasterly winds expected will keep surf along east facing shores below seasonal average.

A Coastal Flood Statement remains in effect for minor coastal flooding of vulnerable low-lying coastal roadways, docks, boat ramps and other coastal infrastructure. King Tides combined with water levels that are running higher than predicted, will lead to minor flooding potential around the daily peak tide, which will be during the late afternoon and early evening hours, through at least Tuesday. While minor coastal flooding is expected along all shorelines, the combination of the south-southwest swell, King Tides and the daily high tide will make low-lying coastal areas along south and west shores susceptible to more widespread coastal flooding.

A Marine Weather Statement also remains in effect due to the large long-period south-southwest swell producing harbor surges and breaking waves near harbor entrances along south and west facing harbors.

 

an island in the middle of a body of water


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

Tropical cyclone formation is not expected during the next 7 days.

>>> Caribbean Sea: There are no active tropical cyclones

 

>>> Gulf of America: There are no active tropical cyclones

Northwestern Gulf of America: 

A trough of low pressure located over northeastern Mexico continues to produce disorganized shower and thunderstorm activity. Development is not expected during the next day or so while the trough remains inland and drifts generally northward over northeastern Mexico and southern Texas. The system is then forecast to move northeastward and could re-emerge over the northwestern Gulf of America late Tuesday or Wednesday, where environmental conditions may support some development around midweek. Regardless of tropical cyclone formation, heavy rainfall, flash flooding and gusty winds are possible across portions of eastern and southern Texas and Louisiana this week.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…low…30 percent

Here’s the link to the National Hurricane Center (NHC)

 

>>> Northeast Pacific: There are no active tropical cyclone

Well Southwest of the Baja California Peninsula:

Invest 93E

A broad area of low pressure located well southwest of the Baja California Peninsula is producing disorganized showers and thunderstorms. Environmental conditions could support some gradual development during the next day or so while the system moves northward and then northwestward at 5 to 10 mph. Thereafter, increasing dry mid-level air is expected to limit further development.

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

 

>>> Central Pacific: There are no active tropical cyclone

Tropical cyclone formation is not expected during the next 7 days.

Here’s the link to the Central Pacific Hurricane Center (CPHC)

 

>>> Northwest Pacific Ocean:  There are no active tropical cyclones

>>> Southwest Pacific Ocean: There are no active tropical cyclones

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

Here’s the link to the Joint Typhoon Warning Center (JTWC)



Interesting: Toward Battery-Free Artificial Photosynthesis: Stable Fuel Production at Lower Cost

Redesigned electrolyzer generated enough power to run a diorama at Osaka Expo.

Researchers at Osaka Metropolitan University have developed an artificial photosynthesis system capable of producing solar fuels more stably by integrating a self-regulating chemical component directly into the electrolyzer itself. The new device doesn’t rely on a battery-powered control method, removing an expensive component of such systems.

Similar to its natural version, artificial photosynthesis uses sunlight to convert water and carbon dioxide into useful fuels such as formic acid.

In artificial photosynthesis systems, the electrolyzer plays a central role by converting electricity generated by solar cells into chemical energy that can be stored as fuel in the form of formic acid.

Read More: Osaka Metropolitan University