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


The latest update to this website was 650pm Monday HST


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

0.29  Kapahi, Kauai
0.87  Maunawili, Oahu
0.05  Honolimaloo, Molokai
0.01  Lanai 1, Lanai
0.05  Hana AP, Maui
0.83  South Point, Big Island


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

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 and southwest

 

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

 

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Showers locally 

 

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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.

330pm, a winter-like rainy day here, temperature a chilly 53 degrees.

641pm, it’s still raining light to moderately heavy. We took a walk after dinner just before dark with our rain jackets on, which is something I haven’t done in quite some time. Bob and I drive north to Sea Ranch tomorrow, where we’ve rented a vacation rental for 5-nights.

 

>>> Highest Temperature Monday, April 20, 2026 – 99 degrees at Stovepipe Wells, CA
>>> Lowest Temperature Monday, April 20, 2026 –  4 degrees at Big Bay, MI

 

Hawaii’s Broad Brush Weather Overview…as of Monday evening: Lighter winds are expected Tuesday and Wednesday as a low passes north of the state. Along with the lighter winds, expect a few clouds and showers over the interior parts of the islands during the afternoon and evening hours.

As the low moves to the northeast late Wednesday, a ridge will build in north of the islands. This will allow trade winds to build back into the area during the second half of the week. By the weekend, more typical trade wind showers will reach the islands on the trade wind flow.

Weather Details for the Hawaiian Islands…as of Monday evening: The trough that passed through the islands has moved to the east. Some thunderstorms formed over the Big Island slopes around mid-day, but have died off since. Another stray thunderstorm is possible through the evening hours.

A low pressure system north of the islands is helping to keep winds light, and that is expected to continue into Wednesday. The lighter winds will result in some localized land and sea breezes. This in turn will lead to some clearing overnight, with some afternoon clouds and showers forming over the interior of the islands.

The second half of the week should see the low move to the far northeast of the islands, and that will allow a new ridge to build north of the region. This will allow trade winds to build across the area during the latter part of the week. A ridge aloft will help to provide a stable airmass over the region with limited shower activity. Moisture upstream of the islands will be carried in on the returning trade wind flow, will likely reach the islands over the weekend, bringing a return to more typical trade wind shower activity.


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.