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

 

The latest update to this website was at 1258pm Monday aftern00n HST


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

0.76  Mount Waialeale, Kauai
0.68  Punaluu Stream, Oahu
0.11  Honolimaloo, Molokai
0.00  Lanai
4.62  West Wailuaiki, Maui
4.76  Honolii Stream, Big Island


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

21  Lawai, Kauai – E
29  Oahu Forest NWR, Oahu – ENE
28  Makapulapai, Molokai – ENE 
27  Lanai 1, Lanai – NE
39  Na Kula, Maui – SE 
25  South Point, Big Island – ENE


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

 

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

Thunderstorms in the deeper tropics south…possible tropical disturbances in the eastern Pacific

 

>>> Well Southwest of the Baja California Peninsula:

Invest 90E

A broad area of low pressure located well southwest of the southern tip of the Baja California Peninsula continues to produce disorganized showers and thunderstorms. Environmental conditions appear conducive for development, and a tropical depression is expected to form during the middle part of the week while the system moves westward or west-northwestward at 10 to 15 mph across the western portion of the East Pacific.

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

 

>>> Eastern East Pacific:

An area of low pressure could form offshore of Central America and southern Mexico late this week or over the weekend. Environmental conditions appear favorable for some development of this system thereafter, while it moves westward to west-northwestward at around 10 mph.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…30 percent

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/13/20261520610-20261521400-GOES18-ABI-HI-13-600x600.gif

A mix of low and high level cloudiness 

 

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…some are heavy 

 

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

Please open this link to see details on the current Watches, Warnings and Advisories noted above




~~~ Hawaii Weather Narrative ~~~

 

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

Mostly clear with windward clouds locally here in Maui County, with calm winds at my place, and with a low of 53 degrees and the relative humidity is 82%

820am, there are quite a few heavy showers over and around the Big Island this morning, along with a couple along the windward side of east Maui.


>>> Highest Temperature Sunday, May 31, 2026 – 108 degrees at Rio Grande Village, TX
>>> Lowest Temperature Monday, June 1, 2026 – 24 degrees at Angel Fire, NM

 

Hawaii’s Broad Brush Weather Overview…as of Monday afternoon:  A plume of moisture moving in from the southeast will bring increasing showers starting with the eastern half of the state today, and spreading over the western half of the state tonight and continuing through Tuesday. Due to the abundant moisture, brief periods of heavy rain will be possible. Our more typical trade wind pattern will return on Wednesday.

Update…as of Monday afternoon: Due to the abundant moisture moving in from the southeast over the next 24 to 36 hours, there will generally be an increase precipitation across the state. While the latest high-res models continue to show the greatest precipitation over windward and southeast Big Island, some localized heavy rain will be possible over windward and mountain areas for the rest of the state, especially tonight into Tuesday.

Also, an Ashfall Advisory remains in effect for episode 48 of the Kilauea eruption. Locations of the tephra fallout will vary today, due to the variable wind directions throughout the atmosphere. Surface winds will generally be out of the northeast to east, but winds at 10,000 feet will generally be out of the southeast to south, and winds above 25,000 ft will generally be out of the west.

Weather Details for the Hawaiian Islands…as of Monday afternoon: Latest satellite and radar imagery show a trough overhead or just to the northeast of the island chain and sagging southward. Low clouds are moving across the islands within the trade wind flow. Radar imagery shows scattered showers ongoing across the islands, mostly impacting windward and mountain locations, with some limited spillover to leeward areas. Some heavier showers are impacting windward Big Island causing some minor flooding or ponding on roadways and low-lying flood prone areas.

As the aforementioned low pressure trough continues advancing through the area, increasing showers will be most pronounced over the eastern end of the state today, then expand up the island chain by Tuesday. Trade winds back northeast and strengthen to moderate levels during the early portion of this new week, focusing showers windward and mountain areas. Breezy trade winds then establish during the second half of the week, as the subtropical ridge of high pressure strengthens north of the area.


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 Environmental Conditions…as of Monday afternoon: Light to moderate trade winds will persist today, then gradually strengthen into the fresh to locally strong category Tuesday through the latter half of the week, as the subtropical ridge builds north of the state. Small Craft Advisory conditions will likely develop in the typically windier channels and waters around Maui County and the Big Island beginning Tuesday.

Surf along exposed south-facing shores will remain elevated this week, as a series of overlapping south to south-southwest swells move through the area. The current south swell, which peaked over the weekend, is slowly easing, with the peak energy down into the 14-15 second band. Long-period forerunners from the new south-southwest swell will steadily fill in today, leading to a building trend by tonight.

Surf is expected to return to advisory levels tonight through Tuesday, and likely rise above the advisory threshold by mid-week as the swell peaks. While some of the peak energy may have missed the American Samoa buoy to the east over the weekend, observations suggest surf heights should peak locally near, or possibly just below, the High Surf Warning threshold along south-facing shores around Wednesday. A gradual downward trend is then expected through the latter half of the week.

Surf along north-facing shores will increase Tuesday and remain up through Friday, as a pair of overlapping northerly swells arrive from a broad gale far north of the state near the Aleutian Islands of AK. Seasonal surf conditions should return by the weekend.

Surf along east-facing shores will gradually build by mid-week, as strengthening trade winds generate increasing short-period wind waves. Surf should return to near seasonal levels by the end of the week.

 


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

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.

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

 

>>> Eastern Pacific: There are no active tropical cyclones

 

Well Southwest of the Baja California Peninsula:

A broad area of low pressure located well southwest of the southern tip of the Baja California Peninsula continues to produce disorganized showers and thunderstorms. Environmental conditions appear conducive for development, and a tropical depression is expected to form during the middle part of the week while moving westward or west-northwestward at 10 to 15 mph across the western portion of the East Pacific.

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

 

>>> Eastern East Pacific:

An area of low pressure could form offshore of Central America and southern Mexico late this week or over the weekend. Environmental conditions appear favorable for some development of this system thereafter, while it moves westward to west-northwestward at around 10 mph.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…30 percent

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

 

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

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: 

Tropical Cyclone 06W (Jangmi)…is located approximately 20 NM northwest of Kadena AB

https://www.metoc.navy.mil/jtwc/products/wp0626.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:  Textile Wastewater Treatment Generates Alarmingly High Levels of Toxic Compounds

Levels are “three times higher than what we’re allowed to shower in, or drink,” UMass Amherst researcher says.

Textile wastewater treatment practices inadvertently produce toxic byproducts—including chloroform and bromoform—at alarming levels that pose a clear occupational health hazard and lead to unknown environmental effects downstream. University of Massachusetts Amherst researchers have found.

“As we did our research, we started to uncover that, in industrially relevant concentrations, a huge amount of byproducts are formed,” says Sean McBeath, assistant professor in the Riccio College of Engineering at UMass Amherst. “The focus of the paper really was the occupational hazards from formed byproducts on the people working in these factories.”

The textile industry accounts for as much as 20% of the world’s wastewater, according to the World Bank. Previous research has shown that textile wastewater can be harmful to the environment, crop production and human health. In an attempt to treat wastewater before it enters the environment, companies have turned to electrochemical methods, essentially zapping the water with electricity to break down the dyes.

Read More: University of Massachusetts Amherst