Glenn James
Hawaii Weather Today
Founder and maintainer for 30 years


The latest update to this website was 705pm Sunday HST


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

0.10  Moloaa Dairy, Kauai
0.07  Punaluu Stream, Oahu
0.00  Molokai
0.00  Lanai
0.06  West Wailuaiki, Maui
0.58  Piihonua, Big Island


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

27  Port Allen, Kauai – SE
21  Kii, Oahu – ESE
22  Makapulapai, Molokai – ENE
21  Lanai 1,  Lanai – NE
27  Na Kula, Maui – SE
24  Kealakomo, Big Island – E


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/07/20261092030-20261100420-GOES18-ABI-TPW-07-900x540.gif

Thunderstorms out to the northwest and far south of Hawaii

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261092010-20261100400-GOES18-ABI-HI-GEOCOLOR-600x600.gif

 High level clouds moving over the state…from the west

 

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 Sunday comments:  I’m here in Corte Madera, Marin County, California with my friends Bob and Linda, continuing on in my working vacation.

955am, Hawaii time, we’ve been talking about everything, as we’ve been best of friends for over 50 years, all three of us. Subjects include the weather of course, food, politics, music, a few poems, how nice the warm sun feels with a cool breeze…and much more. We’re about to drive over to Mill Valley to my favorite store in the world, called Good Earth, to get some stuff for dinner and to have lunch. We’re all looking forward to hunkering down as a cold front brings clouds and rain tomorrow!

652pm, Hawaii time, it’s beginning to cloud up here in Marin, although I can still see the sliver moon. It’s turned windy with the temperature 53 degrees. I’m expecting the cold front to begin sending some showers into this area tomorrow morning.

 

>>> Highest Temperature Sunday, April 19, 2026 – 99 degrees near Horrel Hill, SC
>>> Lowest Temperature Sunday, April 19, 2026 –  4 degrees at Gila Bend, AZ

 

Interesting weather Web Blog: Mauka Showers…Mother Nature Reminds Us that April is Still in the Wet Season

 

Hawaii’s Broad Brush Weather Overview…as of Sunday evening: An upper-level feature moving through the islands through Monday will bring high clouds and the possibility for isolated heavy showers and thunderstorms. Winds will weaken, leading to afternoon showers Tuesday and Wednesday, before trade winds build back in Thursday and Friday.

Weather Details for the Hawaiian Islands…as of Sunday evening: A surface trough, and an associated upper level trough are found a few hundred miles northwest of Kauai. The trough is helping to trigger thunderstorms between 200 and 400 miles northwest of Kauai. As the trough swings to the east over the next day, thunderstorm activity will move with it. The GFS and ECMWF models are in general agreement with the timing of these feature.

Thuderstorm probabilites and climatological based thunderstorm probabilities with both the GFS and ECMWF models keep the bulk of the instability to the north of the islands, but enough of it sinking southward tonight that its possible for some thunderstorms to make it into the islands. While the highest chance for thunderstorms will be over/near Kauai and Oahu, upslope thunderstorms on the Big Island are also possible.

The surface trough is expected to move over the islands behind the trough, and will lead to lighter winds Tuesday and Wednesday. Under this lighter wind regime, we are likely to see some showers develop over interior areas of the islands during the afternoon. Trade winds are expected to return to the islands Thursday, with more typical trade winds showers riding in on the trades by the weekend.


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 Sunday: A trough of low pressure passing northwest of the state will act to weaken and veer winds east southeasterly through mid-week across the local waters. Light flow should allow for afternoon sea breeze development near the shores. As conditions become increasingly unstable aloft, isolated thunderstorms will be possible tonight into Monday, over the waters surrounding Kauai and Oahu. By Thursday, high pressure ridging builds back in north of the state with fresh northeasterly trade winds returning to the region lasting through next weekend.

Swell and surf will remain small along all shores through late Monday.

A small, medium period, northwest swell will move across the waters Monday night and continue through Wednesday. Another small, long period, west northwest swell will enter the waters Wednesday night and provide a slight bump up for surf along west and northwest facing shores. A moderate, medium to long period, northeast swell arrives on Tuesday and peaks on Wednesday, bringing moderate surf to north- facing shores, before slowly declining through the end of the week.

Surf will remain small along south facing shores through the period. Surf heights along east facing shores also remain small due to weaker trade winds until the arrival of the aforementioned moderate, medium to long period, northeast swell building into the Hawaii region from Tuesday through Thursday.

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Wailea beach path, Wailea Elua, Ulua Beach


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:

Tropical Cyclone 04W (Sinlaku)…is located approximately 805 NM northwest of Wake Island – Final Warning

https://www.metoc.navy.mil/jtwc/products/04W_191800sair.jpg

 

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

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



Interesting: When Does the Body Clock Begin to Synchronize with Local Time?

Daily rhythms cross placenta from mother to the baby before the fetus can sense light.

Humans and most other organisms have internal biological clocks that track the daily cycle of sunrise and sunset. These clocks help time our sleep, metabolism and other essential body functions over the course of a day, creating daily patterns called circadian rhythms. Research shows that when these rhythms are disrupted — by jet lag, lack of sleep or irregular work schedules — people can suffer long-term negative health effects.

Scientists who study daily rhythms have long wondered about when the mammalian circadian clock starts ticking and synchronizes to local time. In a new study published in the Journal of Biological Rhythms, researchers at Washington University in St. Louis reported that a mother helps to set the biological clock for her babies while they are still in the womb.

“We know that disrupting circadian rhythms during pregnancy can affect how sleep and daily rhythms develop in infants, and these early disruptions are linked to a higher risk of mood disorders such as anxiety and depression later in life,” said Nikhil Lokesh, study author and a research scientist in biology in WashU Arts & Sciences. “Understanding when the fetal clock begins to function helps us identify sensitive developmental windows when circadian disruption may have lasting effects and how those effects might be prevented or corrected.”

Read More: Washington University in St. Louis