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

 

The latest update to this website was at 8pm Sunday evening HST


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

0.11  Mount Waialeale, Kauai
0.87  Tunnel RG, Oahu
0.71  Puu Alii, Molokai
0.20  Lanai City, Lanai
2.52  West Wailuaiki, Maui
2.93  Glenwood, Big Island


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

20  Port Allen, Kauai – NE 
25  Oahu Forest NWR, Oahu – E
27  Molokai AP, Molokai – E
m   Lanai – m
39  Na Kula, Maui – ESE 
29  Hokuloa, 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/13/20262212140-20262220530-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 Sunday comments:  I’m at home here in upper Kula, Maui, Hawaii

508am, it’s mostly clear here in upper Kula with calm winds, and a low temperature at my place of 55.5 degrees…with the relative humidity 80%

253pm, it’s cloudy with a few light sprinkles here at my place in upper Kula, rather a slightly cool day what with all the clouds this afternoon.

558pm, it’s partly cloudy to cloudy here in upper Kula, with a light shower falling here at my place.

653pm, and it’s still lightly raining here in upper Kula, with a mild 69 degrees.

812pm, very foggy with light rain here at my Kula weather tower, with a mild 67.4 degrees

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 are hints that we could see something coming our way later in the upcoming 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 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

>>> A developing/strengthening tropical cyclone is forecast to move near Hawaii as early as Friday or Saturday, bringing an associated heavy rain threat. Unlike the guidance from 24 hours ago, it’s no longer clear which side of the island chain it would track (south, very close, or north) leaving the wind direction forecast unclear. Winds could very well increase across some of the main islands with this system late in the week/next weekend.

 

>>> 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 Sunday evening: Trades continue with breezy winds through Monday, before weakening slightly Tuesday, then strengthening again Wednesday through Friday. Moisture will decrease late Monday, leading to relatively dry trades from then until late in the week. There is a significant potential (90% chance) for a tropical system to form to our east-southeast soon. It is expected to head in the general direction of Hawaii, but it’s not yet known how close it may come. We should stay informed as new forecasts are issued.

Weather Narrative..as of Sunday evening: Radar indicates some moderate to strong showers on the Big Island, where conditions are favorable for weak thunderstorms to form. Elsewhere, light showers were seen mainly across windward and mountain areas of Maui County, with little to no shower activity over the Island of Oahu or Kauai County.

A strong upper level high to our northeast will help keep trades going through the coming work week. The high is forecast to shift westward late in the week, and this will a significant factor in the track of the potential tropical storm, currently expected to form to our east-southeast and then move west-northwest.

This area is currently known as Invest 93C, and will eventually be named Lala when it forms soon. Model spread is also high, with some solutions taking the system north of the islands, some south, and a few going through our state. No official forecast exists yet. It will take another day or two before we have a forecast track. At this point, it would be wise if folks make sure they are prepared and make sure to stay informed.

Fire Weather: Moderate fire weather conditions are expected for Kauai and Oahu through Monday, under light to breezy trade winds and trade wind showers. Fire weather concerns will be lower over Maui County and the Big Island, where higher rain amounts are forecast through Monday morning.

 

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 Sunday evening: High pressure to the far northeast will remain nearly stationary through midweek as moderate to locally strong trade winds will persist through Wednesday. A Small Craft Advisory (SCA) is in effect through Monday 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 storm 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.

Surf along south facing shores will remain near the August average through Monday as overlapping south swells impact the islands. Surf looks to slowly building through the week. A larger moderate long period south swell is expected to fill in Wednesday and remain elevated through Friday prompting the potential for a High Surf Advisory at its peak.

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 potential of the developing tropical`s track 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 possible 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.

 

Green Scene in Oahu, Hawaii | Paysage jungle, Endroits merveilleux, Hawaï


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 wave is possible through mid-week while it moves quickly westward across the central tropical Atlantic. Upper-level winds are expected to become less conducive for development later in the week when 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:

A small 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