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

 

The latest update to this website was at 517am Monday morning HST


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

0.53  N Wailua Ditch, Kauai
1.31  Tunnel RG, Oahu
1.03  Puu Alii, Molokai
0.43  Lanai City, Lanai
3.79  West Wailuaiki, Maui
4.02  Saddle Quarry, Big Island


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

12  Port Allen, Kauai – ENE 
25  Oahu Forest NWR, Oahu – SE
27  Makapulapai, Molokai – E
m   Lanai – m
32  Kealaloloa Rg, Maui – ESE 
22  South Point, 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 (out of operation). 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

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/tpw/13/GOES18-TPW-13-900x540.gif

 Thunderstorms southeast in the deeper tropics

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/13/20262220640-20262221430-GOES18-ABI-HI-13-600x600.gif

Low clouds arriving on the trade winds…higher clouds coming up from the southwest at times

 

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

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

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

Localized showers…mostly windward, although not exclusively 

 

https://www.weather.gov/wwamap/png/hfo.png

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

505am, it’s mostly clear here in upper Kula with calm winds, and a low temperature at my place of 59.5 degrees…with the relative humidity 86%

 

The warm tropical waters of the Earth’s oceans are very active with tropical cyclones now…and with areas that could become tropical cyclones! There is a high likelihood that we could see something coming our way later this week…more information on that possibility just below:

Central North Pacific: There are no active tropical cyclones

Invest 93C

A broad area of low pressure located about 1100 miles east-southeast of the Hawaiian Islands is producing disorganized showers and thunderstorms and is nearly stationary. Environmental conditions are forecast to be conducive for further development, and a tropical depression is likely to form by mid-week as the system begins moving west-northwestward or northwestward across the Central Pacific.

* Formation chance through 48 hours…medium…50 percent
* Formation chance through 7 days…high…90 percent

>>> Come this weekend, all eyes will be on the track of the tropical disturbance 93C. The National Hurricane Center has this disturbance with a 90% chance of developing into a tropical cyclone through this week period. The track of 93C will be critical, and unfortunately the Hawaiian Islands are right in the middle of the guidance suite, as to where the center of the storm will track. Thus, it appears likely that there will be impacts from this storm this weekend. The track of the storm, as it makes its closest approach to the islands, will be the determining factor as to how significant the impacts will be. Fortunately the islands are a rather small target, so it’s still far more likely that the worst effects of the storm will remain offshore. Nonetheless, the typical impacts from a nearby tropical cyclone can be expected…likely for all the islands (though that too depends on track). These include heavy rain causing flash flooding, gusty winds capable of causing damage to infrastructure, storm surge, and a low likelihood of tornadoes. Thus, it will be very prudent to keep an eye on the forecast in the coming days for the latest updates.

 

>>> Highest Temperature Sunday, August 9, 2026 – 123 degrees at Death Valley, CA


>>> Lowest Temperature Sunday, August 9, 2026 – 30 degrees at Stanley, ID

 

Interesting weather blog: Mauka Showers…Sea Breeze Variations in the Big Island’s South Kohala District

 

Hawaii’s Weather Highlights…as of Monday morning: A high pressure system far to the northeast of the state, will keep trade wind weather in the forecast through much of this week. We are closely monitoring an area for potential tropical cyclone development roughly 1100 miles east-southeast of the Hawaiian Islands. Based on the latest Tropical Weather Outlook from the National Hurricane Center, further development is expected by the middle of this week. The long range Hawaii forecast could change dramatically if this system moves towards the islands.

Weather Narrative..as of Monday morning: A high pressure system far to the northeast of the state will keep trade wind weather conditions blowing through much of this week. A weak easterly wave (low level trough) moving through the islands, continues to produce some unsettled clouds drifting in on the trade winds. This low level trough will continue to enhance showers, as it drifts from east to west across the state, favoring the windward mountain areas, before passing west of the island chain. Drier weather trends with brief passing showers are forecast from Wednesday through Friday.

We are closely monitoring a large area of disorganized convection for potential tropical cyclone development roughly 1100 miles east-southeast of the Hawaiian Islands. Based on the latest Tropical Weather Outlook from the National Hurricane Center, environmental conditions are conducive for further development of this system into a tropical cyclone by the middle of this week. The long range Hawaii forecast for this upcoming weekend could change dramatically if this system develops and then moves towards the islands.

Fire Weather: Fire weather conditions this week will remain just below critical thresholds, due to the lack of stronger wind speeds. Minimum humidity levels will briefly reach criteria each day over the driest leeward areas, and the lower sustained wind speeds will be the limiting factor. Temperature inversion heights near Maui and the Big Island will range from 5,500 to 6,500 feet elevation today.

 

https://www.weather.gov/images/hfo/graphics/npac.gif


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 to the far northeast will remain nearly stationary through mid-week as moderate to locally strong trade winds persist through Wednesday. The Small Craft Advisory (SCA) has been extended through Tuesday afternoon for the windier waters and channels around Maui County and the Big Island. Borderline conditions will likely continue through at least Wednesday, which may prompt further extensions of the SCA.

Later in the week, the focus will shift to the deep tropics southeast of the state. Latest guidance from the National Hurricane Center has a high chance in 7 days for a tropical cyclone to form southeast of the islands. Depending on the track, it will have differing effects on local winds, seas and weather as early as Thursday. Northeasterly winds appear likely to strengthen as the cyclone approaches during the latter half of the week, but impacts will be highly track-dependent, and there is significant forecast uncertainty at this time.

Surf along south facing shores will remain near the August average today, as overlapping south swells impact the islands. Surf builds slowly through the week. A moderate, long period south swell is expected to arrive late Tuesday, fill in Wednesday, and remain elevated through Friday. Surf may approach advisory levels at the peak of the swell.

Surf along east facing shores will continue to remain moderate and rough due to moderate to locally strong trade winds. Later in the week, the track of a developing tropical cyclone will dictate the potential for a swell from the southeast to east. Aside from wrapping trade wind energy, surf along north-facing shores will remain flat to tiny through the week.

Due to a combination of peak monthly high tides and water levels running higher than predicted in a few locations, a Coastal Flood Statement is in effect for minor coastal flooding around the afternoon high tide through at least Tuesday. Tides will be decreasing on Wednesday, but coastal flooding may continue to be possible around high tide for locations where water levels are running highest.

 

Discover the Endless Beauty of Hawaii Landscape Photography


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 Tropical Atlantic:

A broad area of showers and thunderstorms associated with a tropical wave is located about midway between the coast of west Africa and the Lesser Antilles. Some gradual development of this system is possible through mid-week while it moves quickly westward across the central tropical Atlantic. Upper-level winds are expected to become less favorable for development later in the week as the system approaches the Lesser Antilles.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…10 percent

 

Eastern and Central Tropical Atlantic:

An area of low pressure located a few hundred miles south of the Cabo Verde Islands is producing disorganized showers and thunderstorms. As this system moves slowly westward, a tropical wave currently over west Africa is expected to merge with it in a couple of days. Environmental conditions are forecast to be more conducive for development by midweek, and a tropical depression could form during the latter half of this week while the system moves westward to west-northwestward across the central tropical Atlantic.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…medium…60 percent

 

Western Subtropical Atlantic:

A trough of low pressure located a few hundred miles northwest of Bermuda is producing disorganized shower and thunderstorm activity. Some development of this system is possible during the next couple of days while it moves quickly eastward, well to the north of Bermuda, across the western and central subtropical Atlantic. The system is forecast to reach cooler waters later this week, ending its chances of formation after Wednesday.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…10 percent

 

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

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

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

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

 

Northeast Pacific: There are no active tropical cyclones

>>> Western East Pacific:

A large area of disorganized showers and thunderstorms is located well to the west-southwest of the southern tip of the Baja California Peninsula. Environmental conditions appear favorable enough for some gradual development, and a tropical depression could form during the next few days while the system moves slowly west-northwestward to northwestward across the western portion of the East Pacific.

*Formation chance through 48 hours…low…30 percent
*Formation chance through 7 days…medium…60 percent

 

>>> Southwest of Mexico:

Disorganized showers and thunderstorms located several hundred miles south of the southern tip of the Baja California Peninsula are associated with a tropical wave. Environmental conditions appear marginally conducive for slow development during the next day or two as it moves west-northwestward at around 15 mph. By late Tuesday, the system is expected to reach an area of strong upper-level winds, ending its chances for development.

*Formation chance through 48 hours…low…10 percent
*Formation chance through 7 days…low…10 percent

 

Central North Pacific: There are no active tropical cyclones

Invest 93C

A broad area of low pressure located about 1100 miles east-southeast of the Hawaiian Islands is producing disorganized showers and thunderstorms and is nearly stationary. Environmental conditions are forecast to be conducive for further development, and a tropical depression is expected to form by mid-week as the system begins moving west-northwestward or northwestward across the Central Pacific.

* Formation chance through 48 hours…medium…50 percent
* Formation chance through 7 days…high…90 percent

 

>>> Northwest Pacific Ocean:

https://www.metoc.navy.mil/jtwc/products/abpwsair.jpg

 

Tropical cyclone 12W (Dolphin)…is located approximately 175 NM north-northwest of Taipei, Taiwan – Final Warning

https://www.metoc.navy.mil/jtwc/products/wp1226.gif

 

Tropical cyclone 14W (Chan-hom)…is located approximately 503 NM east of Yokosuka, Japan

https://www.metoc.navy.mil/jtwc/products/wp1426.gif

 

Tropical cyclone 13W (Peilou)…is located approximately 452 NM north-northeast of Andersen AFB

https://www.metoc.navy.mil/jtwc/products/wp1326.gif

 

Tropical cyclone 15W…is located approximately 522 NM northwest of Wake Island

https://www.metoc.navy.mil/jtwc/products/wp1526.gif

 

>>> 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: Climate Change Isn’t Driving All Mountain Trees Higher, Global Study Finds

A new study published in Nature Climate Change reveals a more complex reality: some tree species are moving uphill, while others are shifting downhill, and the key to understanding these contrasting responses lies in how trees manage water.

In one of the largest analyses of its kind, an international team of researchers integrated tree-ring records from more than 121,000 trees representing 45 species, climate-growth data from 3,057 forest sites worldwide, hydraulic trait information, and global observations of elevational range shifts across 102 mountain tree species. Their findings show that a tree species’ hydraulic traits, physiological characteristics that regulate water transport, drought tolerance, and growth, are powerful predictors of how forests reorganize under climate change.

A co-author of the paper, Tim Rademacher, Director of UVM’s Proctor Maple Research Center, describes the significance of their findings: “This research explains why some tree species move uphill with climate warming while others do not, improving our ability to forecast future forest distributions and identify conservation priorities. Understanding how trees balance growth and drought resistance helps explain their responses to climate change and offers a roadmap for predicting tomorrow’s forests.”

Read More: University of Vermont