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


The latest update to this website was 930am Monday HST


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

0.34  Mount Waialeale, Kauai
0.89  Moanalua RG, Oahu
0.11   Honolimaloo, Molokai
0.04  Lanai 1, Lanai
0.47  Puu Kukui, Maui
1.04  Glenwood, Big Island


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

12  Lawai, Kauai – ENE 
30  Oahu Forest NWR, Oahu – ENE
25  Makapulapai, Molokai – E
20  Lanai 1, Lanai – NE
35  Na Kula, Maui – SE 
25  Puuloa, 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

Cold front far northwest…thunderstorms far southwest

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261171100-20261171850-GOES18-ABI-HI-GEOCOLOR-600x600.gif

 High clouds moving by to the south…clipping the Big Island 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

Showers locally 

 

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 here at my friend Linda’s house, along with my friend Bob, in Corte Madera, Marin County, California, continuing on in my working vacation.

 

>>> Mauka Showers, an interesting weather web blog…Hawaii’s Wet Season, Part 3 (Final) – Overall Trends

 

>>> Highest Temperature Sunday, April 26, 2026 – 102 degrees at Rio Grande Village, TX
>>> Lowest Temperature Monday, April 27, 2026 – 2 degrees at Peter Sinks, UT

 

Hawaii’s Broad Brush Weather Overview…as of Monday morning: A high pressure system far north of the Hawaiian Islands will slowly drift east, however a broad ridge north of the area will remain in place, keeping easterly trade winds blowing through into the weekend.

An upper level trough approaching the islands will deepen into an upper low near Kauai Tuesday, leading to increasing cloud and shower trends through the week. Showers will favor windward mountain areas in the overnight to early morning hours, with brief periods of showers drifting into leeward areas.

Weather Details for the Hawaiian Islands…as of Monday morning: The satellite picture shows clouds surrounding a low level trough that continues to drift westward, with the trough axis currently just west of Kauai. High level cirrus clouds, associated with a subtropical jet stream south of the islands, will continue to stream over the Big Island. An upper level trough is approaching the island chain from the northwest direction

This upper level trough will enhance shower activity through Tuesday. Models are in good agreement that this upper trough will deepen into a weak closed low near Kauai by Tuesday. Expect temperature inversion heights to rise from 6,000 to 8,000 feet elevation during this time period, deepening cloud heights, producing a wet trade wind weather pattern across the state.

This developing upper low will slowly drift eastward Tuesday, with a troughing pattern lingering just northeast of the state into Friday. The upper low`s upstream position, just northeast of the islands, will lift the clouds to higher heights, producing continued wet trade wind weather conditions.

These showers will favor windward island mountain slopes, especially during the diurnal rainfall maximum overnight to early morning hours. Periods of passing showers will continue throughout the week and into the weekend, due to the persistent unstable trough setting up just northeast of the islands.


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 morning: Moderate to fresh easterly trades will continue through Tuesday, then strengthen by mid-week, as a weak trough shifts to the west and the ridge builds north of the state. This will likely correspond to Small Craft Advisory winds across the typically windier waters surrounding Maui County and the Big Island beginning Wednesday.

Surf along exposed north- and west-facing shores will gradually ease into Tuesday, as a northwest swell lowers. An upward trend is expected during the second half of the week, as swells generated by a broad low that has lifted north into the Bering Sea near the Date Line reaches the islands.

Looking further ahead, confidence remains lower due to model differences, but some guidance continues to suggest a more potent storm evolving over the far northwest Pacific over the next couple of days. If this scenario materializes, a longer-period northwest swell could arrive by the weekend, with surf heights potentially approaching advisory-levels along exposed north and west facing shores.

Surf along south-facing shores will remain small through much of the week, with mainly background south to southwest swells expected. Another south-southwest pulse may arrive by this weekend from recent activity within our swell window east of New Zealand.

Surf along east-facing shores will remain relatively small and choppy due through mid-week, with a slight rise possible later in the week as trades strengthen.

 

Hawaii Volcano eruption. Lava Flow, Volcanic, Lava, Big Island


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:  Threat of California’s Native Tree Loss Is Greater Than Current Estimates

New study finds that many of the state’s valuable and most recognizable trees could decline sooner than expected because current risk calculations don’t incorporate climate change.

From the scarecrow-like silhouettes of Joshua Tree National Park to the fog-shrouded Redwood Coast of Mendocino and Humboldt counties, California’s identity is deeply rooted in its trees. However, a new study led by researchers at the University of California, Santa Cruz, warns that these foundational species are in much more trouble than international conservation rankings estimate.

The study, published in the journal Global Change Biology, reveals that over the next century, California’s endemic and near-endemic trees are projected to lose between half and three-quarters of their climatically suitable habitat. Perhaps most strikingly, the research demonstrates that the trees’ current conservation status on the globally authoritative International Union for Conservation of Nature (IUCN) Red List don’t yet reflect this imminent risk.

Read More: University of California – Santa Cruz

Image: The blue oak, an iconic tree found only in California and seen across the state’s inland ranges and hills, is far more vulnerable to climate change than is reflected by its current status on the International Union for Conservation of Nature’s “Red List,” according to a new climate-informed risk-assessment framework developed by UC Santa Cruz researchers.