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

 

The latest update to this website was Monday morning at 921am HST


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

5.61  Mount Waialeale, Kauai
2.15  Kalawahine, Oahu
0.11  Puu Alii, Molokai
0.08  Lanai City, Lanai
1.83  West Wailuaiki, Maui
5.74  Pahoa, Big Island


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

17  Nawiliwili, Kauai – NE
37  Oahu Forest NWR, Oahu – SE
29  Makapulapai, Molokai – E 
21  Lanai 1, Lanai – NE
33  Na Kula, Maui – ENE
27  Kawaihae Rd, 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.

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Big Blue…click twice for largest version

 

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Thunderstorms in the deeper tropics…cold front far northwest 

 

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

 

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Showers locally…a couple 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

It’s partly cloudy here in Maui County, with calm winds at my place, with a low of 56.5 degrees and the relative humidity is 76%

 

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 Monday morning:  An unstable and somewhat wet trade wind pattern will continue through mid-week, with brief downpours possible. During the second half of the week, a strengthening area of high pressure north of the islands will increase stability across the region, producing drier, but windier conditions.

Weather Details for the Hawaiian Islands…as of Monday morning:  This morning, local satellite and radar imagery shows just a few light scattered showers, moving into the islands on moderate easterly trade wind flow. While some areas of the state received significant rainfall totals yesterday, shower intensity and coverage eased area-wide after sunset. With that said, the early morning sounding from Hilo continues to show over two inches of precipitable water, compared to the much drier Lihue sounding.

Broad troughing aloft persists over the islands, and with this amount of ample moisture available, expect that a generally wet trade wind pattern will continue for the next couple of days, with frequent showers over windward areas, especially for the Big Island. Some showers could produce brief downpours, similar to those that were observed this past weekend at times. Showers will generally favor windward areas during the overnight and morning hours, with scattered leeward showers developing during the afternoons. Additionally, dewpoints will continue to linger in the upper 60’s to low 70’s, which should make temperatures feel warmer than normal.

Increased stability and stronger trade winds are expected by Thursday. Latest global guidance remains in good agreement with a strong high developing far north of the state during the second half of the week, which should result in windy conditions. Winds could potentially reach Wind Advisory levels Thursday into Friday for select areas downstream of terrain. Drier conditions are also expected during this time, but scattered showers embedded within the windy trade wind flow will continue, especially during the night and early morning hours.


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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:  The pressure gradient back from a surface high centered about 1,400 nautical miles northeast of the islands, remains tight enough to support moderate to locally fresh trades the next few days. This anchored high will strengthen and expand past mid-week. The resultant tightening gradient will produce fresh to locally strong trades during the later half of the week.

A small size, short to medium period, north-northwest (320-330 degree) bump tonight into early Tuesday, will provide an additional foot or two upon north-facing shore surf Tuesday. The arrival of a couple of medium to long period, south-southwest (200 degree) swells the next few days will maintain seasonable surf along southern facing shores.

Strengthening trades later this week will keep short period, elevated wind wave chop alive going into the weekend.

Water levels peaking between 2.5 to 3.0 feet during today`s high tides may result in some minor overwash within low lying coastal areas.

 

 

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