Glenn James
Hawaii Weather Today
Creator and Administrator for 30 years


The latest update to this website was 106pm Monday HST


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

0.02  Waiakoali, Kauai
0.87  Maunawili, Oahu
0.05  Honolimaloo, Molokai
0.01  Lanai 1, Lanai
0.07  Hana AP, Maui
0.99  Piihonua, Big Island


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

18  Port Allen, Kauai – SE
16  Kii, Oahu – SE
16  Makapulapai, Molokai – ESE
15  Lanai 1,  Lanai – NNW
18  Na Kula, Maui – SE
19  Hilo AP, 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

 

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Thunderstorms northeast…and far southeast

 

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 High level clouds moving over the state…from the west locally

 

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Showers locally…a few 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 here in Corte Madera, Marin County, California with my friends Bob and Linda, continuing on in my working vacation.

441am Hawaii time, it’s definitely cloudy this morning here at Linda’s, and a few sprinkles have already fell. My phone shows a 100% chance of rain both today and tomorrow. The low temperature here was 55 degrees.

921am Hawaii time, the few sprinkles have progressed into a definite light rain, not a shower…but bonafide rain.

 

>>> Highest Temperature Sunday, April 19, 2026 – 99 degrees near Horrel Hill, SC
>>> Lowest Temperature Monday, April 20, 2026 –  4 degrees at Big Bay, MI

 

Hawaii’s Broad Brush Weather Overview…as of Monday afternoon: An upper level trough passing through the region will maintain some higher level clouds over the islands, with scattered showers and the chance for a thunderstorm or two, mainly over the western islands.

Lighter winds are expected to spread across the region Tuesday and Wednesday, leading to some afternoon clouds and showers. A ridge builds back in north of the state by Thursday, allowing moderate easterly trade winds with passing windward showers to return lasting through the upcoming weekend.

Update: Thunderstorms have formed over the interior of the Big Island, with the chances of thunderstorms continuing into the evening hours.

Weather Details for the Hawaiian Islands…as of Monday morning: Infrared satellite imagery this morning shows moderate to heavy showers and thunderstorms collapsing as they approach the western coastal waters of Kauai. A few of these thunderstorms will likely reach these western coastal waters, however the entire system will likely collapse into a more moderate rain band by the time it reaches the islands of Kauai and Niihau.

Elsewhere, the passing upper level trough shown on satellite water vapor imagery will increase shower trends today across the state, especially along southeastern slopes of Haleakala on Maui, and the southeast slopes of Mauna Loa on the Big Island this afternoon. An upper level trough will swiftly pass from west to east across the state today in southeasterly wind flow, briefly enhancing shower activity as it passes over the island chain.

An upper level ridge will build in behind the trough as the trough moves away from the islands tonight into Tuesday. Expect drying trends as the upper level ridge builds stabilizing subsidence, downward moving warming and drying air, strengthening and lowering the subsidence inversion heights across the Hawaii region. Stronger subsidence will build the surface ridge north of the islands, allowing trade winds to return to the region Wednesday night on into the upcoming 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 Monday: 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 wind flow should allow for afternoon sea breeze development near the shores. Isolated thunderstorms are expected to continue over the northwestern waters in the vicinity of the trough through tonight. By Thursday, high pressure ridging builds back in north of the state with fresh northeasterly trade winds returning to the region into the weekend.

Swell and surf will remain small along all shores. A small, medium-period northwest swell arrives tonight, bringing an uptick in surf along north and west facing shores for Tuesday, before peaking on Wednesday. A moderate, medium-period north-northeast swell arrives on Tuesday and peaks on Wednesday, bringing moderate surf to north and northeast facing shores, before slowly declining through the end of the week. 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.

Surf will continue to be small along south facing shores through the period. East facing shores will see an increase in surf with the arrival of the aforementioned north-northeasterly swell despite below-seasonal average trades.

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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: This Drone Reveals What Lies Beneath Snow and Soil

As industry, infrastructure and society move into increasingly inaccessible and weather-prone areas, the risk and the need for accurate knowledge increase.

Many of the biggest challenges lie hidden below the surface – in snow, soil, ice and rock.

This is precisely where SINTEF deploys its drones with advanced sensors. They are equipped with radar, magnetics and cameras.

Read More at: Norwegian University of Science and Technology

This photo depicts researchers mapping the depth, moisture and risk levels in the snowpack at Fonnbu, NGI’s research station on Strynefjellet in western Norway. This is one of the country’s most avalanche-prone areas.