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


The latest update to this website was 508pm Monday HST


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

0.20  Kilohana, Kauai
0.41  Tunnel RG, Oahu
0.10  Puu Alii, Molokai
0.03  Lanai 1, Lanai
0.60  Puu Kukui, Maui
1.30  Pupukea Rd, Big Island


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

18  Hanalei, Kauai – ESE 
27  Oahu Forest NWR, Oahu – ESE
25  Makapulapai, Molokai – E 
27  Lanai 1, Lanai – NE
33  Maalaea Bay, Maui – NNW 
28  Kealakomo, 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 far northwest…thunderstorms far southwest

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261171800-20261180200-GOES18-ABI-HI-GEOCOLOR-600x600.gif

 High clouds moving by to the south 

 

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 

 

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.

1010am Hawaii time, we’ve had a leisurely morning here in Corte Madera, sitting around and having very interesting conversations about our lives and where we see ourselves going from here. Bob and I are leaving for the drive over to my favorite market in the world called Good Earth…in Mill Valley. We’ll sit outside and have lunch and continue our ongoing discussions. Bob leaves tomorrow morning, and I’m likely going to be feeling a sense of loss, after spending the last almost 3 weeks together.

455pm, Linda, Bob and I just had a great final dinner together, which was fresh Alaskan King Salmon, Japan Sweet Potatoes, and Zucchini. As the sun went down into clear skies, the temperature has dropped quickly to 54.5 degrees.

 

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

 

>>> Highest Temperature Monday, April 27, 2026 – 106 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 afternoon: Moderate easterly trade winds are expected to continue throughout the week. An upper level trough approaching the islands will deepen into an upper low near Kauai Tuesday. This upper disturbance will pass by the islands, then linger northeast of the state throughout the week.

This will result in increased clouds and showers 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. Locations sheltered from the moderate easterly trade winds, could also see increased clouds and a few showers during the afternoon hours.

Weather Details for the Hawaiian Islands…as of Monday evening: GOES water vapor imagery shows a deepening trough aloft northwest of the Hawaiian Islands. Meanwhile, high pressure at the surface centered far northeast of the state is supporting moderate easterly trade winds. Latest radar and satellite imagery shows scattered showers along primarily windward and mountain areas, though some sheltered leeward and interior locations have experienced increases in clouds and showers as well due to localized sea breezes.

The upper level trough northwest of the islands will approach the state over the next 24 hours. As it approaches, this trough is forecast to develop into a weak closed low aloft near Kauai Tuesday. Further destabilization will occur as temperature inversion heights rise and clouds heights deepen. Therefore, expect enhanced trade wind shower activity throughout this period.

The developing low aloft will drift eastward Tuesday, but then is expected to linger northeast of the state for several days. With this upper disturbance lingering nearby, a continued wet trade wind pattern will continue for much of the rest of the week. These showers will favor windward and mountain slopes, especially during the overnight through early morning hours. Trades will maintain moderate speeds this week, so sheltered leeward areas could also see increases in afternoon clouds and a few showers, as localized sea breezes develop each day.


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: Moderate to fresh east-northeasterly trades will continue through Tuesday, then strengthen Tuesday night or Wednesday as a weak trough currently traversing the main Hawaiian islands shifts to the west and a 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 by Wednesday.

Surf along exposed north- and west-facing shores eases tonight as a northwest swell fades. However, a small bump in surf is expected through the day on Tuesday with the arrival of a small northwest swell. An upward trend is expected during the second half of the week as another northwest swell arrives. Looking further ahead, a storm-force low east of Japan will send a moderate, longer-period northwest swell toward the islands for Friday and Saturday, 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 swell expected. Another south-southwest pulse may arrive by this weekend from recent activity within our swell window east of New Zealand, providing a small increase in surf.

Surf along east-facing shores will remain relatively small and choppy through midweek, 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.