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


The latest update to this website was 423pm Tuesday HST


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

0.30  Moloaa Dairy, Kauai
0.09  Punaluu Stream, Oahu
0.00  Molokai
0.00  Lanai
0.00  Maui
0.83  South Point, Big Island


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

12  Mana, Kauai – SW
16  Oahu Forest NWR, Oahu – SW
13  Makaena, Molokai – SW
10  Lanai 1, Lanai – NE
16  Na Kula, Maui – SE
21  Hilo AP, 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

Cold front northwest…thunderstorms far south 

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261111410-20261112200-GOES18-ABI-HI-GEOCOLOR-600x600.gif

 Some well developed cumulus clouds northeast

 

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

Showers locally…a few are heavy over Oahu 

 

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 here in Corte Madera, Marin County, California with my friends Bob and Linda, continuing on in my working vacation.

416am Hawaii time, it’s cloudy this morning, and there’s still water dripping off the leaves, with a low temperature of 50.5 degrees

Bob and I drive north to Sea Ranch (coastal Sonoma County) today, where we’ve rented a vacation rental for 5-nights.

1240am Hawaii time, we’ve driven up the north coast to Sea Ranch, which is just south of Gualala. We’ve put our groceries away, set up our laptops, and are updating our individual work spaces. It’s sunny and warm, and we have a great view down to the ocean.

 

>>> Highest Temperature Tuesday, April 21, 2026 – 96 degrees near Casa Grande, AZ
>>> Lowest Temperature Tuesday, April 21, 2026 –  3 degrees at Mount Washington, NH

 

Hawaii’s Broad Brush Weather Overview…as of Tuesday afternoon: A light land and sea breeze pattern will produce afternoon clouds and spotty showers over land and partial clearing at night. Trade winds will redevelop late Wednesday and strengthen Thursday and Friday, focusing rainfall over windward and mountain areas.

Weather Details for the Hawaiian Islands…as of Tuesday afternoon: A humid land and sea breeze regime will prevail over the next 24 hours or so. Isolated showers near the coasts will dissipate during the early morning, followed by interior clouds and spotty showers in the afternoon. While stability is slowly returning, a briefly heavy shower is still possible in the afternoon and evening.

Trades will slowly redevelop on Wednesday as the low to the north drifts east and weakens. The combination of the building trades and gradually increasing stability will lessen chances for afternoon showers. Trade winds will strengthen Thursday and Friday and will persist into early next week as surface high pressure becomes established north of the islands.

The moderate to locally breezy trades and more stable conditions will push dew points back into the lower 60’s, providing relief from the recent humidity. Showers will become focused over windward slopes.


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: A weak low north of the area extends a trough south toward the islands, which will keep light to locally moderate east-southeast flow in place across the local waters through early Wednesday. Light wind flow should allow for afternoon sea breeze development near the shores. During the latter half of the week, surface high pressure building north of the area, will bring a return of moderate to locally strong northeasterly trade winds.

A small, medium-period, northwest swell build, providing a small bump to surf along north and west-facing shores. At least one other northwest swell of similar size and period arrives, which will support elevated surf along west-facing shores through mid-week. A moderate, medium-period north-northeast swell also arrives and peaks on We

East-facing shores will see an increase in surf with wrap from the north-northeasterly swell, despite below seasonal average trade winds. Strengthening trades late this week will support closer to seasonal average surf for east facing shores into the weekend. Surf will continue to be small along south facing shores.

.

 

Surfers on Waikiki Beach with view of Diamond Head


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

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

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

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

 

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

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

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

Here’s the link to the Central Pacific Hurricane Center (CPHC)

 

>>> Northwest Pacific Ocean:  There are no active tropical cyclones

>>> Southwest Pacific Ocean: There are no active tropical cyclones

>>> North and South Indian Oceans / Arabian Sea: There are no active tropical cyclones



Interesting: Ocean Eddies are Amplifying Climate Extremes in Coastal Seas, Study Finds

Lisa Beal, a professor of ocean sciences at the University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science, collaborated with South African researchers to study the Agulhas Current, a fast and narrow western boundary current flowing poleward along the southeast coast of Africa. Over a two-year period, they gathered high-resolution mooring data, recording hourly measurements of velocity, temperature, and salinity throughout the entire depth and width of the current.

The dataset launched more than a decade of research, with foundational work led at the Rosenstiel School and now advanced through sustained collaboration with Kathryn Gunn at the University of Southampton in the United Kingdom. Gunn and Beal use this dataset to show that increasing eddy activity is reshaping the Agulhas Current and intensifying adjacent coastal temperature extremes. Their findings, published in a new study in the journal Nature Climate Change, identify small frontal instabilities, about 10 kilometers across, along with larger, iconic meanders of the current, that transfer heat, salt, and nutrients between the open ocean and coastal environments.

“More eddy activity is accelerating surface warming in the Agulhas, while simultaneously enhancing hidden upwelling that cools deeper waters,” said Beal, the study’s senior author. “This combination—along with the onshore encroachment also driven by eddies—will create more extreme conditions in shelf seas in the future, potentially placing significant strain on coastal ecosystems.”

Read more at: University of Miami Rosenstiel School of Marine, Atmospheric, and Earth Science

Ocean currents on Feb 11, 2018 from OSCAR v2.0, distributed by NASA JPL, generated by Earth and Space Research, and visualized by earth.nullschool.net.