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

 

The latest update to this website was at 451am Tuesday morning HST


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

1.22  Lower Limahuli, Kauai
0.68  Punaluu Stream, Oahu
0.11  Honolimaloo, Molokai
0.00  Lanai
5.31  West Wailuaiki, Maui
5.11  Honolii Stream, Big Island


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

18  Lawai, Kauai – ENE
38  Oahu Forest NWR, Oahu – ENE
29  Molokai AP, Molokai – NE 
24  Lanai 1, Lanai – NE
35  Kahului AP Maui – NE 
27  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. 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

Visible satellite imagery and satellite-derived wind data indicate that the area of low pressure located well southwest of the southern tip of the Baja California Peninsula has become slightly better defined today, but the shower and thunderstorm activity remains disorganized. Environmental conditions appear conducive for additional development, and a tropical depression is expected to form during the next couple of days while the system moves westward or west-northwestward around 10 mph across the western portion of the East Pacific.

* Formation chance through 48 hours…medium…60 percent
* Formation chance through 7 days…high…90 percent

 

>>> Eastern East Pacific:

An area of low pressure is likely to 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, and a tropical depression could form by early next week while it moves westward to northwestward at around 10 mph

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…40 percent

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/13/20261530600-20261531400-GOES18-ABI-HI-13-600x600.gif

A mix of low and high level cloudiness 

 

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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.

607pm, it’s cloudy here in upper Kula, with foggy conditions locally…dry conditions so far…relative humidity 81%

643pm, it finally began to very lightly rain here at my place in upper Kula.


>>> Highest Temperature Monday, June 1, 2026 – 109 degrees at Death Valley, CA
>>> Lowest Temperature Tuesday, June 2, 2026 – 23 degrees near Mackay, ID

 

Hawaii’s Broad Brush Weather Overview…as of Monday evening:  A plume of moisture moving in from the southeast is causing an increase in showers over the eastern half of the state. This moisture will continue to spread westward into Tuesday. Due to the abundant moisture, brief periods of heavy rain will be possible. Also the increase of humidity could make tonight feel warmer than usual. Our more typical trade wind pattern will return on Wednesday.

Weather Details for the Hawaiian Islands…as of Monday evening: A weak surface trough moving in from the southeast will bring an increase of showers, as this moisture moves east to west tonight through Tuesday. Latest sounding from Hilo and Lihue shows the moisture gradient with values of over 2 inches at Hilo and 1.3 inches at Lihue. Showers will be increasing over Maui County tonight, and spread towards Oahu and Kauai tonight into Tuesday. With the moderate trade winds in place, showers will generally focus over windward and mountain areas. But due to some southeasterly flow in the lower levels, some leeward areas should also see some scattered showers. While the instability remains lackluster, the abundant moisture should provide some brief periods of some locally heavy rain during the next 24 to 36 hours.

By Wednesday afternoon, the plume of moisture should be west of the state with drier air moving in from the east. Trades are expected to strengthen towards the end of the week, with breezy to locally strong trades expected around Friday. Precipitable water values remain near normal or slightly below normal for the second half of the week, which should translate to our typical windward and mountain showers, primarily during the nights and early morning hours.


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 evening: High pressure far northeast of the Hawaiian Islands will strengthen through Wednesday, then shift north of the islands through the remainder of the week. A scatterometer pass showed that strong winds had developed through the typical channels and waters in the vicinity of the Big Island. As a result, a Small Craft Advisory (SCA) has been issued for the typically windier waters around Maui County and the Big Island.

High resolution guidance suggests that these winds are likely to stick around, especially with the broader-scale trade winds continuing to intensify in response to strengthening ridging north of the islands this week. This will likely necessitate expansion of the SCA into the windward waters and further along the island chain within the next few days.

Surf along exposed south-facing shores will remain elevated this week as a series of overlapping south to south-southwest swells move through the region. Long-period forerunners from a new south-southwest swell are steadily filling in, which is expected to bring surf back to advisory levels by Tuesday morning. A second long-period south-southwest swell arriving tonight will likely push surf above the advisory threshold as the swell peaks on Wednesday. A gradual downward trend is then expected for the latter half of the week.

Surf along north-facing shores will see a small uptick on Tuesday, with a (relatively) larger swell arriving Wednesday night, bringing small surf Thursday into Friday from a broad gale far north of the state near the Aleutian Islands.

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

 

rainbow at Hanalei beach in Kauai


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

Western East Pacific:

Invest 90E

Satellite images indicate that an area of low pressure located well southwest of the southern tip of the Baja California Peninsula is beginning to show signs of organization. Environmental conditions appear conducive for additional development, and a tropical depression is expected to form during the next day or two while the system moves westward or west-northwestward around 10 mph across the western portion of the East Pacific.

* Formation chance through 48 hours…high…80 percent
* Formation chance through 7 days…high…90 percent

 

>>> Eastern East Pacific:

An area of low pressure is likely to 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, and a tropical depression could form by early next week while it moves generally northwestward at around 10 mph.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…40 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 136 NM south-southeast of Iwakuni, Japan

 

 

>>> 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:  Lake Erie Produces ‘Forbidden Soup’ of Rotating Potential Toxins

Municipalities and federal agencies monitor U.S. waters for microcystins, a toxin produced by harmful algal blooms in Lake Erie, but a University of Michigan study shows that the blooms produce a greater range of potentially toxic compounds than previously known.

The researchers found that these compounds, called bioactive cyanopeptides, may overlap and interact with each other in ways that amplify their toxicity throughout the season. Now, they say, it will be important to characterize these compounds, determine their toxicity and examine how they interact with each other.

“A lot of people are aware of these algal toxins, but the big picture is that these harmful algal blooms are expanding with climate change, and they’re a real threat to recreation, drinking water and ecosystems,” said senior author Gregory Dick, professor of earth and environmental sciences and of environment and sustainability.

Read More: University of Michigan