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

 

The latest update to this website was at 610am Tuesday morning HST


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

1.15  Lower Limahuli, Kauai
1.68  Moanalua RG, Oahu
0.92  Puu Alii, Molokai
0.22  Lanai City, Lanai
6.74  Puu Kukui, Maui
10.40  Saddle Quarry, Big Island


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

20  Lawai, Kauai – E
38  Oahu Forest NWR, Oahu – E 
25  Makapulapai, Molokai – ENE 
27  Lanai 1, Lanai – NE
25  Kealaloloa Rg Maui – N 
22  Hilo AP, Big Island – SE


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

 

>>> Western East Pacific:

Invest 90E 

Shower and thunderstorm activity has become better organized in association with an area of low pressure located well southwest of the southern tip of the Baja California Peninsula. Additionally, satellite-derived wind data indicate that the circulation has become better defined since yesterday. Continued development is expected, and a tropical depression is likely to form later today or tonight, while the system moves generally west-northwestward at 10 to 15 mph across the western portion of the East Pacific.

* Formation chance through 48 hours…high…90 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

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/13/20261531130-20261531930-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 Tuesday comments:  I’m at home here in upper Kula, Maui, Hawaii

Mostly cloudy here in Maui County, with calm winds at my place, and with a low of 62 degrees and the relative humidity is 85%

10am, it’s cloudy with light rain falling here in upper Kula, with the relative humidity 82%


>>> 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 Tuesday morning:  A plume of moisture moving in from the southeast is causing and increase in showers over the eastern half of the state. This moisture will continue to spread westward today. Due to the abundant moisture, brief periods of heavy rain will be possible. Our more typical trade wind pattern will return on Wednesday through the weekend.

Update: Showers have been numerous across most areas, as an area of enhanced moisture moves east to west across the state. Precipitation has been consistent enough and heavy enough to warrant a Flood Advisory for the northeast through southeast coastal areas on Big Island. The enhanced moisture will remain over the islands this afternoon.

Weather Details for the Hawaiian Islands…as of Tuesday morning: A weak surface trough is is moving up the island chain east to west. Latest radar imagery shows numerous showers with some locally heavier pockets moving across the Big Island into Maui County. Showers will continue to spread into Oahu and Kauai as the morning progresses.

Moderate trades should keep the focus of showers over windward and mountain locations, however some low-level southeasterly flow is allowing some showers to make it into leeward areas. With abundant moisture some brief periods of locally heavy rainfall will be possible during the next 24 hours or so.

Drier conditions return, east to west with the aforementioned surface trough moving west of the area Wednesday into Friday. Trades are expected strengthen on Friday into the weekend. Breezy to locally strong trades with typical windward and mountain showers can be expected.


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 Tuesday morning: Fresh to strong easterly trades have returned as a subtropical ridge strengthens north of the islands, resulting in Small Craft Advisory conditions across the typically windier channels and waters around Maui and the Big Island. Additional marine waters, particularly the Maui County windward waters and the Kaiwi Channel, may need to be added to the advisory as the area of strong winds expands. Guidance suggests this pattern will persist through the weekend.

Surf along exposed south-facing shores is trending upward as a fresh long-period south-southwest swell fills in. Nearshore buoys reflect this trend, with peak spectral energy centered near the 18-second band. Offshore observations from buoy 51002 also indicate increasing energy within these long-period bands, supporting a continued building trend through the day today. Surf heights may approach High Surf Warning criteria by late Wednesday as the swell peaks. Thereafter, a gradual downward trend is expected through the latter half of the week.

Surf along north-facing shores will begin to build later today and continue increasing through the second half of the week, as a couple of out-of-season northerly swells arrive from broad low pressure centered far north of the state near the Aleutian Islands of AK. Surf heights will likely rise above the seasonal average by Wednesday, then remain elevated through Thursday and Friday before gradually easing over the weekend.

Surf along east-facing shores will gradually build through the week, 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

Shower and thunderstorm activity has become better organized in association with an area of low pressure located well southwest of the southern tip of the Baja California Peninsula. Additionally, satellite-derived wind data indicate that the circulation has become better defined since yesterday. Continued development is expected, and a tropical depression is likely to form later today or tonight while the system moves generally west-northwestward at 10 to 15 mph across the western portion of the East Pacific.

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

undefined

undefined

 

>>> 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 157 NM south-southeast of Iwakuni, Japan

https://www.metoc.navy.mil/jtwc/products/wp0626.gif

https://www.metoc.navy.mil/jtwc/products/06W_021800sair.jpg

 

>>> 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