Glenn James
Hawaii Weather Today
Founder and maintainer for 30 years


The latest update to this website was 333am Saturday HST


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

0.01  Wainiha, Kauai
0.04  Kahuku Trng Area, Oahu
0.00  Molokai
0.00  Lanai
0.01  Keokea, Maui
0.06  Kulaiman0, Big Island


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

29  Lawai, Kauai – E
23  Oahu Forest NWR, Oahu – ENE
25  Makapulapai, Molokai – ENE
23  Lanai 1,  Lanai – NE
31  Kealaloloa Rg, Maui – NNE
24  Lalamilo, 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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Multi-level clouds moving over the state…from the southwest

 

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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 Saturday comments:  I’m here in Bend, Oregon with my friend Bob, continuing on in my working vacation.

249am Hawaii time, Bob and I are up early this morning, as we depart Bend and take the long drive down to our friend Linda’s place in Corte Madera, Marin County, California. I’ll be unable to do any updates until I get there and have a chance to set up my laptop…which should be this afternoon Hawaii time.

 

>>> Highest Temperature Friday, April 17, 2026 – 102 degrees at Rio Grande Village, TX
>>> Lowest Temperature Saturday, April 18, 2026 –  minus 10 degrees Peter Sinks, Utah

 

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 Saturday morning: Moderate trades will persist through today, leading to some showers along windward and mountain areas. An upper-level trough just west of the state will produce high clouds and trigger a few heavy showers and thunderstorms across interior Big Island and around Kauai.

Trades will weaken and veer southeasterly by the latter half of the weekend, as low pressure deepens northwest of Kauai. Another, more potent upper-level trough will bring renewed chances for isolated heavy showers early next week. By Tuesday, light winds and increased afternoon shower activity is anticipated across island interiors.

Weather Details for the Hawaiian Islands…as of Saturday morning: Moderate trades will persist for one additional day as a slow-moving surface high pressure system north of the Hawaiian Islands tracks eastward. Simultaneously, a weakening upper-level trough positioned just west of the state continues to generate high-level cloud coverage and diminish overall atmospheric stability. Increasing diurnal heating throughout the morning and afternoon is expected to heighten instability, potentially triggering another round of thunderstorms across the interior of the Big Island.

Satellite imagery indicates persistent thunderstorm activity northwest of Kauai, associated with a developing low pressure system. Although this system remains relatively weak and is situated several hundred miles to the west, it may cause trades to veer southeasterly and weaken. This shift could result in isolated, potentially heavy showers over leeward sections of all islands. However, as the upper-level trough moves further away tonight, the threat of localized heavy rainfall will diminish, shifting shower activity predominately toward windward and mountains regions.

A more potent upper-level trough is forecast to approach the state during the latter half of the weekend, introducing increased instability from tomorrow night into Monday. Global models suggest that the majority of moisture and shower activity will remain concentrated along a quasi-stationary surface trough linked to the low pressure system northwest of Kauai. Elsewhere, rainfall will be focused over island interiors, with continued potential for thunderstorms on the Big Island.

There is the possibility of localized heavy showers anchoring along the Koolau Mountains on Oahu Sunday night. While current moisture levels do not appear significant, veering flow with height often facilitates heavy rainfall in this specific terrain; therefore, close monitoring of this trend is warranted. By Tuesday, the upper-level trough is expected to drift east of the islands, followed by the rapid arrival of weak ridging. This transition should lead to a general decrease of shower activity statewide. However, model guidance indicates that the surface trough previously northwest of Kauai will migrate over the western portion of the state. This movement will likely promote light and variable winds along with the increased possibility of afternoon rainfall over island interiors.


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

 

Marine Environmental Conditions…as of Saturday: A high pressure system far north of the state will slowly drift eastward this weekend. Easterly trade winds continue with Small Craft Advisory conditions in effect for the windier waters and channels near the Big Island and Maui. A series of low pressure systems developing northwest of the islands will weaken the ridge over the state, causing weak southeasterly winds to develop over the western Hawaii region from Sunday into early next week.

A small pulse of medium period swell energy from the northwest should produce a slight bump in north facing surf heights. A small to moderate, medium period northwest swell will move into the region by Monday night and continue through Wednesday. A moderate, medium period northeast swell will arrive by Monday night, peaking from Tuesday to early Wednesday, and then slowly declining through Thursday. A series of overlapping small south swells will move into the region into next week. Surf heights along east facing shores remains on the smaller side due to weaker trade winds.

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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 340 NM east of Iwo To

https://www.metoc.navy.mil/jtwc/products/04W_181200sair.jpghttps://www.metoc.navy.mil/jtwc/products/04W_180600sair.jpg

 

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

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



Interesting:  Simple Menu Tweak Shown to Boost Vegetarian Choices and Cuts Carbon

Replacing just one meat dish with a vegetarian option in workplace cafeterias can significantly shift what people eat – cutting both calories and carbon emissions – according to a new study from researchers at the Nuffield Department of Primary Care Health Sciences, University of Oxford.

In the new study, published in the International Journal of Behavioral Nutrition and Physical Activity, researchers tested the change in six English worksite cafeterias, asking managers to swap one meat-based lunch option for a vegetarian dish while keeping prices, choice and all other menu features the same. Customers were not told about the change, and meat options remained available.

Over seven weeks and more than 26,000 meals, the results showed the likelihood of choosing a vegetarian main increased by 41%.

Meals sold during the intervention were also healthier and more sustainable. On average, they contained around 26 fewer calories – about one cup of tea with milk and a teaspoon of sugar, as well as lower levels of saturated fat and salt, and had a lower environmental footprint, including an 8.5% reduction in greenhouse gas emissions per meal.

Read More: University of Oxford