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

 

The latest update to this website was at 826pm Monday evening HST


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

0.44  Mount Waialeale, Kauai
0.82  Lyon, Oahu
0.18  Puu Alii, Molokai
028  Lanai City, Lanai
0.83  Puu Kukui, Maui
1.29  Piihonua, Big Island


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

21  Lawaii, Kauai – E
25  Kuaokala, Oahu – NE
27  Molokai AP, Molokai – NE
23  Lanai 1, Lanai – NE
32  Kahului AP, Maui – NE
31  Kealakomo, Big Island – ENE  


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

Cold front northwest…thunderstorms far southeast (Tropical Disturbance…no threat to Hawaii)

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20261662200-20261670550-GOES18-ABI-HI-14-600x600.gif

Variable low clouds 

 

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

Localized showers 

 

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

Please open this link to see details on any 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 it’s mostly clear, with calm winds at my place, and with a low temperature of 50 degrees and the relative humidity is 85%

315pm, I played Pickleball in Makawao this morning, and was pleased with how I played, and enjoyed seeing my PB friends. It’s quite sunny this afternoon, although there are cloudy areas here and there on Maui.

6pm, partly cloudy and dry in most areas around the state as we head slowly towards the sunset hour.

856pm, still some clouds are here in upper Kula, with my temperature having dropped to 61.3 degrees…with the relative humidity running 77%

 

>>> Highest Temperature Monday, June 15, 2026 – 115 at Death Valley, CA
>>> Lowest Temperature Monday, June 15, 2026 – 23 degrees at Peter Sinks, UT

 

>>> Interesting Web Blog: Mauka Showers…Central North Pacific Tropical Cyclone Tracks in Strong El Niños, Part 2 – The Late Bloomer Years

 

Hawaii’s Broad Brush Weather Overview…as of Monday evening:  Slightly weaker trade wind flow is expected on Tuesday with a few light windward showers. Wednesday into Thursday, light easterly flow will lead to the development of daytime sea breezes and nighttime land breezes. Thus, most cloud cover and shower activity will be limited to interior and mountain areas during the afternoons. In addition, deeper moisture moving in from the southeast Wednesday through Friday should bring increased shower chances to the Big Island and Maui.

Weather Details for the Hawaiian Islands…as of Monday evening: Mostly dry and stable conditions are prevailing across the main Hawaiian Islands. Rain gauges across the state reveal that even the few showers that are present are light, with the vast majority of the state picking up no measurable rainfall. High pressure centered far northeast of the island chain is steering locally breezy trade winds over the region.

Tonight, an upper level trough and its associated surface front will move eastward, north of the state. As this occurs, the high pressure to the northeast will become displaced farther away, weakening local trade wind flow. Moderate trades will continue Tuesday, with little overall change in the weather pattern, with a few light windward showers.

By Wednesday, the local pressure gradient is expected to weaken even further, with background winds becoming light and variable. Daytime heating, combined with weak surface flow, will lead to daytime sea breezes and nighttime land breezes. Clouds and showers should mainly be limited to over the island interiors and mountainous terrain, particularly during the day.

By late Wednesday or Wednesday night, however, global forecast models remain consistent in a pocket of deeper moisture associated, with a weak surface trough moving northward from the southeast towards the Big Island. This feature could act to increase shower coverage, especially along eastern portions of the Big Island.

Long range models continue to push this band of moisture up through Maui County, and to a lesser extent, Oahu on Thursday into Friday, before lifting it northward. Light southeast flow, combined with this batch of moisture, could lead to an increase in shower activity over the islands interiors during the afternoons. More typical trade wind weather should return by the weekend.

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https://www.weather.gov/images/hfo/graphics/npac.gif


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 evening: Moderate to fresh trade winds will become light to moderate by the middle of the week as a couple of surface troughs develop northwest of the state, weakening the surface ridge north of the area. The ridge will strengthen late in the week and over the weekend as the troughs weaken and lift far north, allowing fresh to moderate trades to return.

A large, long period south southwest swell will maintain warning level surf through tonight. A High Surf Warning remains in effect until 6am Tuesday for all south-facing shores. Buoy 51002 readings this afternoon have dropped a foot since this morning and are now hovering around 4 to 5 feet at 15 to 16 seconds. Continue to expect a slow decline in surf as this large swell fades over the next couple of days. Surf along south-facing shores will drop to High Surf Advisory (HSA) levels by Tuesday morning and then could further drop below HSA levels Wednesday. Another south southwest swell is expected to fill in Wednesday night into Thursday that could push surf back up to advisory levels.

Very little swell energy is arriving along north-facing shores, keeping surf tiny to flat. A small bump in surf is possible for north-facing shores Tuesday into Wednesday with the arrival of a small northwest swell and a smaller north swell. Surf along east-facing shores will remain below average as winds ease through midweek.

A Coastal Flood Statement remains in effect for minor coastal flooding of vulnerable low-lying coastal roadways, docks, boat ramps and other coastal infrastructure due to King Tides. King Tides combined with water levels that are running higher than predicted will lead to minor flooding potential around the daily peak tide, which will be during the late afternoon and early evening hours, through Tuesday and possibly Wednesday. While minor coastal flooding is expected along all shorelines, the combination of the large south southwest swell and peak daily high tides will make low-lying coastal areas along south and west shores susceptible to more widespread coastal flooding for another day or so.

A Marine Weather Statement also remains in effect due to the large, long-period south southwest swell producing harbor surges and breaking waves near harbor entrances along south and west-facing harbors.

 

an island in the middle of a body of water


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

 

>>> Gulf of America: There are no active tropical cyclones

Northwestern Gulf of America: 

Invest 90L

A trough of low pressure located inland near the Texas/Mexico border continues to produce a large area of disorganized showers and thunderstorms. The system could re-emerge over the northwestern Gulf of America today, and environmental conditions there are expected to be marginally conducive for the formation of a short-lived tropical storm later today or on Wednesday.

Regardless of tropical cyclone formation, interests across southern and eastern Texas and portions of Louisiana and Mississippi should prepare for periods of intense rainfall over the next several days which could produce widespread, life-threatening flash, urban, and river flooding. Gusty winds and coastal flooding are also possible along portions of the northwestern Gulf Coast, and Tropical Storm Watches or Warnings could be required later today.

* Formation chance through 48 hours…medium…60 percent
* Formation chance through 7 days…medium…60 percent

Here’s the link to the National Hurricane Center (NHC)

 

>>> Northeast Pacific: There are no active tropical cyclone

Well east-southeast of the Hawaiian Islands:

Invest 93E

A broad area of low pressure located well east-southeast of the Hawaiian Islands is producing disorganized showers and thunderstorms. Some slight development of this system is still possible over the next day or so while it moves northward and then northwestward at 5 to 10 mph. Thereafter, increasingly dry mid-level air is expected to limit further development.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…low…20 percent

 

>>> Central Pacific: There are no active tropical cyclone

Well East-Southeast of the Hawaiian Islands:

Invest 93E

A broad area of low pressure located well east-southeast of the Hawaiian Islands is producing disorganized showers and thunderstorms. Some slight development of this system is still possible over the next day or so while it moves northward and then northwestward at 5 to 10 mph. Thereafter, increasingly dry mid-level air is expected to limit further development.

* Formation chance through 48 hours…low…20 percent 
* Formation chance through 7 days…low…20 percent

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

Here’s the link to the Joint Typhoon Warning Center (JTWC)



Interesting: Toward Battery-Free Artificial Photosynthesis: Stable Fuel Production at Lower Cost

Redesigned electrolyzer generated enough power to run a diorama at Osaka Expo.

Researchers at Osaka Metropolitan University have developed an artificial photosynthesis system capable of producing solar fuels more stably by integrating a self-regulating chemical component directly into the electrolyzer itself. The new device doesn’t rely on a battery-powered control method, removing an expensive component of such systems.

Similar to its natural version, artificial photosynthesis uses sunlight to convert water and carbon dioxide into useful fuels such as formic acid.

In artificial photosynthesis systems, the electrolyzer plays a central role by converting electricity generated by solar cells into chemical energy that can be stored as fuel in the form of formic acid.

Read More: Osaka Metropolitan University