Glenn James
Hawaii Weather Today
Founder and maintainer for 30 years


The latest update to this website was  328am Monday morning HST


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

0.24  Waiakoali, Kauai 
0.44  Kamananui Stream, Oahu
2.63  Puu Alii, Molokai
1.52  Lanai 1, Lanai
2.30  West Wailuaiki, Maui
1.92  Keahuolu, Big Island


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

13  Makaha Ridge, Kauai – SE
12  Palehua 3, Oahu – NW
12   Anapuka, Molokai – NE
14  Lanai 1,  Lanai – NE 
17  Kealia Pond, Maui – NNE 
24  Hilo AP, Big Island – SE


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

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/tpw/13/GOES18-TPW-13-900x540.gif

A deep area of low pressure far north…with thunderstorms southwest

 


https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261030440-20261031230-GOES18-ABI-HI-GEOCOLOR-600x600.gif

Multi-level clouds moving over the state 

 

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

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

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

Showers locally…some heavy

 

https://www.weather.gov/wwamap/png/hfo.png

Please open this link to see details on the current Watches, Warnings and Advisories noted above




~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Sunday comments:  I’m here in Vancouver, BC, Canada with my friend Bob, continuing on in my working vacation.

805am Hawaii time, it’s cloudy here in Vancouver, with the temperature 56.3 degrees, after a low 46 degrees. We walked over to our favorite breakfast restaurant, called Cafe Zen, which we’re both taken with, after all…three mornings in a row. We’re heading over to Stanley Park, to walk the sea wall, while looking for Orca’s (killer whales), and Heron’s nesting up in the trees.

244pm, it’s cloudy and cool although with no rain. We took a long walk along the sea wall, and then headed inland a bit, to walk around a lake called Lost Lagoon. We saw several large Herons, and enjoyed looking across the water at all the skyscrapers near downtown. We ended up at Whole Foods and I had my usual large salad, and ate it while sitting outside. We then went to a coffee place and I got a double Americano, which we took down to English Bay Beach and sat looking out the water and did a bit of people watching.

636pm Hawaii time, it’s cloudy here in Vancouver, and 52.1 degrees. Bob and I walked down to a Mexican food restaurant, and I had a couple of roasted vegetable taco’s.

 

>>> Interesting weather web blog – Mauka Showers…How Fast is a Flash Flood in Hawaii?

>>> Highest Temperature Sunday, April 12, 2026 – 95 degrees at Rio Grande Village, TX
>>> Lowest Temperature Monday, April 13, 2026 –  11 degrees Lund, NV

 

Hawaii’s Broad Brush Weather Overview…as of 3pm Sunday afternoon:  Light to moderate rain will continue through tonight over the western portion of the state. A few showers may be locally heavy. Quieter weather then settles in for the remainder of the week, and light trades return by week`s end.

Weather Details for the Hawaiian Islands…as of 3pm Sunday afternoon: No instability, weak forcing, and rather high stability have allowed Oahu to dodge a potentially impactful flooding event. Little change is expected during the next several hours, so rain rates are expected to remain in check. Will draw back the ending time for Kauai through Maui to 6am tomorrow morning.

Light showers and mid-level clouds are likely to linger over the western end of the state for the balance of the week, before another trough pivots through, and brings a slight increase in rainfall on Friday or Friday night. This trough is modeled to be progressive and likely not impactful. Despite the grungy pattern that may hang over Kauai and Oahu through the week, for the first time in awhile, there is no potential event on the horizon.

The large scale pattern is gradually migrating away from low pressure anchoring north of the islands, though high pressure struggles to build as the mid-latitudes transition toward a more progressive pattern. Light winds favoring onshore sea breezes each afternoon, may trigger rather productive convection in terms of showers as the moisture-rich airmass lingers. Trades do return by late in the week, but remain quite light and may not make much of a dent in local humidity.

 

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: A weak surface trough will linger in the vicinity of the central and northwestern islands into early next week, keeping moderate to fresh southeasterly winds to its east, and light to moderate southerly winds to its west. This weak surface boundary along with an upper level disturbance moving over the region is currently bringing another round of showers and the potential for isolated thunderstorms this afternoon into Monday. As the surface trough lifts northwest and high pressure to the northeast begins to take over at the surface, gentle to moderate easterly trades will gradually develop across the Hawaiian coastal waters by the end of the week.

A moderate, medium-period north-northwest swell (340 degrees) generated by the formerly-gale force low north-northwest of the main Hawaiian islands is filling in along north and west facing shores this afternoon. This swell will maintain small to moderate surf through Monday, followed by a decline in northwest swell energy for the rest of the week.

A medium-period south swell will continue to decline through Monday. By Tuesday, however, a new south swell will arrive, once again providing a boost to surf along south facing shores through mid week before gradually subsiding into the weekend.

Surf along east facing shores will remain below seasonal average with lighter than average trade winds near and upstream of the islands forecast through next week.

 

r/pics - a rainbow over the ocean.

 Rainy weather locally


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 203 NM east-southeast of Navsta, Guam

https://www.metoc.navy.mil/jtwc/products/04W_130600sair.jpg

 

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

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



Interesting:  MIT Researchers Measure Traffic Emissions, to the Block, in Real-Time

A new study pieces together existing data sources in order to develop a detailed, dynamic picture of auto emissions.

In a study focused on New York City, MIT researchers have shown that existing sensors and mobile data can be used to generate a near real-time, high-resolution picture of auto emissions, which could be used to develop local transportation and decarbonization policies.

The new method produces much more detailed data than some other common approaches, which use intermittent samples of vehicle emissions. The researchers say it is also more practical and scales up better than some studies that have aimed for very granular emissions data from a small number of automobiles at once. The work helps bridge the gap between less-detailed citywide emissions inventories and highly detailed analyses based on individual vehicles.

“Our model, by combining real-time traffic cameras with multiple data sources, allows extrapolating very detailed emission maps, down to a single road and hour of the day,” says Paolo Santi, a principal research scientist in the MIT Senseable City Lab and co-author of a new paper detailing the project’s results. “Such detailed information can prove very helpful to support decision-making and understand effects of traffic and mobility interventions.”

Read More: Massachusetts Institute of Technology (MIT)