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

 

The latest update to this website was at 916am Monday morning HST


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

0.12  Puu Lua, Kauai
0.11  Makaha Stream, Oahu
0.00  Molokai
0.00  Lanai
0.02  Kahikinui 1, Maui
0.80  Waiaha Stream, Big Island


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

13  Lawai, Kauai – ENE
20  Oahu Forest NWR, Oahu – ESE
18  Molokai AP, Molokai – ENE
22  Lanai 1, Lanai – NE
30  Kealaloloa Rg, Maui – NE
25  Waikoloa Rd, 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.

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 fronts north and northwest…thunderstorms far south 

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/14/20261731050-20261731840-GOES18-ABI-HI-14-600x600.gif

Variable low clouds although mostly clear in many areas…high cirrus clouds southeast

 

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

521am, it’s clear here in upper Kula, with calm winds, and a low temperature at my place of 52.5 degrees…with the relative humidity 76%

919am, still very clear, with less haze than over the last several days.

 

>>> Highest Temperature Sunday, June 21, 2026 – 112 at Stovepipe Wells, CA
>>> Lowest Temperature Monday, June 22, 2026 – 26 degrees at Peter Sinks, UT

 

Hawaii’s Weather Highlights…as of Monday morning:  Mostly dry and stable conditions with light to moderate trade winds will prevail today, with clouds and mainly light showers favoring windward and mountain locations through the morning hours. A few cloud buildups and light showers are possible over leeward sections this afternoon, where localized sea breezes form.

A modest increase in moisture associated with a surface trough moving in from the east, combined with an upper-level disturbance, will support increasing rainfall chances from Tuesday into mid-week. Trade winds will then strengthen into the breezy category Wednesday through the second half of the week, as the trough and upper disturbance shift west of the area, and the ridge strengthens north of the islands.

Weather Commentary…as of Monday morning: A relatively dry and stable trade wind pattern will persist today, as a weak surface ridge remains positioned north of the islands. Light to moderate easterly trades will continue, with clouds and a few light showers primarily favoring windward and mountain areas through the morning hours. Afternoon heating and localized sea breeze development may support a few cloud buildups and brief showers over leeward and interior sections, but rainfall amounts should remain limited.

Conditions will begin to change late tonight into Tuesday, as a surface trough moves in from the east, and moisture begins to increase across the island chain. Guidance remains in good agreement showing precipitable water values rising to near 1.75 inches by Wednesday. At the same time, an upper-level trough is forecast to dig southward over the area, eventually cutting off and retrograding westward across the area through the middle part of the week.

The approach of this upper disturbance will help to weaken and elevate the inversion. The combination of slightly deeper moisture, reduced stability, and enhanced large-scale lift associated with the upper low, will support increasing shower coverage and rainfall potential from Tuesday through Thursday, particularly over windward and mountain areas, though some showers may periodically spread into leeward locations.

By late week into the weekend, both the surface trough and upper- level disturbance are expected to shift west of the state. In their wake, a strengthening subtropical ridge north of the islands, will support a return to a more typical breezy trade wind pattern. Upper heights will gradually rise, the trade wind inversion will strengthen and lower, and precipitable water values are expected to decrease back toward climatological levels. As a result, shower activity should trend downward, with rainfall becoming focused over windward and mountain areas.

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 Conditions…as of Monday morning: A weak high pressure ridge will remain nearly stationary north of the waters, maintaining gentle to locally fresh trade winds through Tuesday night. High pressure to the far north-northeast will strengthen by mid-week, as easterly trade winds gradually strengthen to moderate to locally strong levels. A Small Craft Advisory (SCA) may need to be issued for the windier waters and channels around Maui County and the Big Island on Wednesday through the end of the week. A low level trough moving in from the east Tuesday through Wednesday will bring an increase in shower activity.

A series of small to moderate, medium to long period south swells, will keep surf along south facing shores elevated through the forecast period. Another boost in south swell is expected Wednesday night into Thursday below High Surf Advisory levels. Surf along east facing shores will remain small due to the lack of trade winds energy upstream of the islands through Tuesday. Easterly wind wave looks to increase Wednesday into the end of the week, to moderate levels as trade winds increase. Surf along north facing shores will remain flat to tiny through the forecast period, with potentially tiny background energy mid-week into Thursday.

 

Aerial panorama of Hanauma Bay with water cliffs and Koko crater summit in the background, Oahu Island


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

Tropical cyclone formation is not expected during the next 7 days.

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

Tropical cyclone formation is not expected during the next 7 days.

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

 

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

Central and Western Portion of the East Pacific:

Showers and thunderstorms have become more concentrated today with a tropical wave located a few hundred miles south-southwest of the coast of southwestern Mexico. This system is forecast to move westward to west-northwestward at 10 to 15 mph across the central portion of the East Pacific basin, and some additional development is possible through midweek before environmental conditions become unfavorable late this week.

* Formation chance through 48 hours…low…30 percent
* Formation chance through 7 days…low…30 percent

 

Well offshore of Southwestern Mexico:

A low pressure system is expected to form late this week several hundred miles offshore of the coast of southwestern Mexico. Some slow development of this system is possible after that time while it moves west-northwestward at 10 to 15 mph.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…30 percent

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

 

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

Central and Western Portion of the East Pacific 

Showers and thunderstorms have become more concentrated today with a tropical wave located a few hundred miles south-southwest of the coast of southwestern Mexico. This system is forecast to move westward to west-northwestward at 10 to 15 mph across the central portion of the East Pacific basin, and some additional development is possible through midweek before environmental conditions become unfavorable late this week.

* Formation chance through 48 hours…low…30 percent
* Formation chance through 7 days…low…30 percent

Here’s the link to the Central Pacific Hurricane Center (CPHC)

 

>>> Northwest Pacific Ocean: 

Tropical Cyclone 07W (Mekkhala)…is located approximately 513 NM south of Kadena AB

https://www.metoc.navy.mil/jtwc/products/wp0726.gif

Tropical Cyclone 08W…is located approximately 172 NM east of Andersen AFB

https://www.metoc.navy.mil/jtwc/products/wp0826.gif

>>> 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:  Reforestation Effects on Water Resources Depend on Global Warming Level

Planting trees is widely promoted as a natural solution to climate change. But a new study led by researchers from the Institute of Atmospheric Physics at the Chinese Academy of Sciences finds that the hydrological consequences of reforestation depend critically on how much the world warms.

Using the latest Earth system model simulations from the CMIP6 project, the research team compared the effects of the same large?scale reforestation activity under two contrasting future scenarios: a low?warming pathway (SSP1?2.6) and a high?warming pathway (SSP3?7.0). They focused on land water availability — the balance between precipitation and evaporation — which is essential for ecosystems, agriculture, and human water use.

“The same trees, planted at the same scale, lead to nearly opposite outcomes depending on the background climate,” said Dr. TANG Tao, lead author of the study published in One Earth. “Under low warming, reforestation slightly increases global water but widens the gap between wet and dry regions — the rich get richer. Under high warming, it reduces overall water availability but makes water distribution more equal.”

Read More: Institute of Atmospheric Physics, Chinese Academy of Sciences