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

 

The latest update to this website was Monday morning at 503am HST


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

3.13  Mount Waialeale, Kauai
2.48  Oahu Forest NWR, Oahu
0.28  Honolimaloo, Molokai
0.02  Lanai City, Lanai
1.87  West Wailuaiki, Maui
6.95  Pahoa, Big Island


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

18  Nawiliwili, Kauai – NE
33  Oahu Forest NWR, Oahu – ESE
22  Makapulapai, Molokai – ENE
25  Lanai 1, Lanai – NE
28  Na Kula, Maui – E
24  South Point, 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

 

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Lots of thunderstorms in the deeper tropic southwest…cold front far northwest 

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20261372130-20261380520-GOES18-ABI-HI-14-600x600.gif

Variably cloudy, with a mix of low, middle and high level clouds 

 

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https://radar.weather.gov/ridge/standard/PHKI_loop.gif

https://radar.weather.gov/ridge/standard/PHKM_loop.gif

Showers locally…some are heavy 

 

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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 at home here in upper Kula, Maui, Hawaii

 

April Showers Bring May Flowers to Hawaii - Revealed Travel Guides
The Jacaranda Trees are going off here in upcountry Kula, Maui


>>> Highest Temperature Sunday, May 17, 2026 – 109 degrees at Rio Grande Village, TX
>>> Lowest Temperature Monday, May 18, 2026 – 14 degrees at Austin, NV

 

>>> Interesting Weather Web blog: Mauka Showers…2025-2026 Wet Season Numbers…And Here Comes El Niño!

 

Hawaii’s Broad Brush Weather Overview…as of Sunday evening:  A slightly unstable and somewhat wet trade wind flow will continue into Monday. An increasingly stable, moderate to breezy trade wind flow will develop Tuesday and Wednesday, and will persist into next weekend.

Weather Details for the Hawaiian Islands…as of Sunday evening:  Scattered heavy showers developed over select areas across the state, due to the higher than normal moisture values combined with some afternoon day time heating. As we head into the evening, the intensity of the showers should generally decrease. The one exception is over windward Big Island and possibly east Maui, where we are seeing frequent trade wind showers. Hilo sounding showed over 2 inches of precipitable water values, and a wet trade wind pattern could very well continue for the Big Island through the middle of the week, with frequent showers over windward areas.

Overall, broad troughing aloft combined with higher than normal precipitable water values, and moderate easterly trade winds will continue to produce brief downpours at times through the middle of the week. Showers will generally favor windward areas during the overnight and morning hours, with scattered leeward showers developing during the afternoons. Humidity levels will remain moist, which should make temperatures feel warmer than normal.

Increased stability and stronger trade winds are expected by Thursday. Latest global guidance from the GFS and ECMWF are in good agreement with a strong high developing far north of the state, which should result in windy conditions. Winds could very well reach Wind Advisory thresholds Thursday into Friday for select areas downstream of terrain. Drier conditions are also expected during this time, but scattered showers should continue to ride in with the windy trade winds, especially during the night and early morning hours.


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 Sunday evening: Moderate to locally fresh easterly trades have returned. An upper level-low that plagued the state has moved off to the northeast, increasing stability and decreasing showers.

A small, medium-period north-northwest (320-330 degree) swell will continue to decline through tonight, with surf along north-facing shores following suit. A medium-period north-northwest reinforcement may provide another small bump in surf along north-facing shores by early Monday morning, followed by another small reinforcing swell on Tuesday.

Surf along west-facing shores will remain nearly steady through the rest of this weekend, as the northwest swell influence gradually declines, but a new, long-period south-southwest swell fills in.

A mix of small, medium- to long-period, south swells will maintain small surf along south-facing shores for the next several days. The long-period south-southwest swell described above will increase surf along south-facing shores through today. Additional small, medium- to long-period, south swell reinforcements will arrive through mid-week.

Moderate to fresh trades will maintain rough and choppy surf along east-facing shores for the next several days.

Tides will peak around 2.5 to 3.0 feet today. Minor overwash of low lying coastal areas will be possible during times of high tide.

 

 

Top 4 Kid-Friendly Beaches on Oahu


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

Tropical cyclone formation is not expected during the next 7 days.

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

 

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

Routine issuance of the Tropical Weather Outlook will begin on June 1, 2026.

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

 

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

>>> 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:  Improving Plastics Recycling From End-of-Life Vehicles

Each year, four to six million cars are scrapped in the EU—resulting in the loss of resources. The EU End-of-Life Vehicles Regulation is intended to ensure that these materials are recovered and reused in new vehicles in the future. Researchers at the TUM have now analyzed a process developed within the Car2Car research project that enables plastics to remain within the recycling loop. The study shows potential climate benefits as well as the possibility of meeting upcoming EU requirements.

When a vehicle is taken out of service, it is quickly reduced to its basic components: batteries, wheels, catalytic converters, and airbags are removed, and fluids are drained. What remains is sent to a shredder. The result is a heterogeneous mix of metals, textiles, plastics, foams, and composite materials. Extracting recyclable plastics from this mixture is complex, but it is becoming increasingly important for automakers and suppliers, as the EU is currently planning a new regulation on the treatment of end-of-life vehicles. Once the regulation comes into effect, the share of recycled plastics used in new vehicles that comes from post-consumer recycling is to be gradually increased to 25 percent.

A portion of this recycled content must come from “closed?loop recycling,” meaning recycling plastics from end?of?life vehicles back into new vehicles. According to the EU proposal, this share should account for at least 20 percent of the required recycled content. “At first glance, that may not sound like much, but around 200 kilograms of plastic will be generated per end?of?life vehicle in the future,” says Magnus Fröhling, Professor of Circular Economy and Sustainability Assessment at TUM Campus Straubing. “In addition, plastics recycling has played only a minor role in the automotive industry so far, meaning we are still at a very early stage in this regard.”

Read more at: Technical University of Munich