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

 

The latest update to this website was at 830pm Monday evening HST


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

0.32  Kilohana, Kauai
0.13  Waianae, Oahu
0.00  Molokai
0.00  Lanai
0.02  West Wailuaiki, Maui
0.67  Honolii Stream, Big Island


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

15  Port Allen, Kauai – NE
27  Kuaokala, Oahu – ENE
23  Makapulapai, Molokai – E
27  Lanai 1, Lanai – NE
28  Kealaloloa Rg, Maui – NNE
35  Kealakomo, Big Island – NNW


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/14/20261732120-20261740520-GOES18-ABI-HI-14-600x600.gif

An area of showery clouds (a trough of low pressure) is moving into the state from the east..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.

5pm, it sunny to partly sunny, even along the windward sides. Speaking of windward, we have an area of showers heading into those coasts and slopes tonight into Tuesday and likely Wednesday.

825pm, it’s very clear here over most of Maui, although low clouds will be arriving along the windward sides tonight into Wednesday. Here at my Kula weather tower, as the skies are clear, the temperature has dropped already to 60.4 degrees.

 

>>> Highest Temperature Monday, June 22, 2026 – 115 at Rio Grande Village, TX
>>> Lowest Temperature Monday, June 22, 2026 – 26 degrees at Peter Sinks, UT

 

Hawaii’s Weather Highlights…as of Monday evening: After a dry day Monday, we’ll see an increase in both moisture and trade winds Tuesday into Wednesday. This will bring an increase in showers, mainly windward and mountains. Trades will continue at moderate to occasionally breezy levels into the weekend, with the potential for a drier period Friday and Saturday.

Weather Commentary…as of Monday evening: Scattered showers were moving over Kauai County, with only light isolated showers elsewhere. Skies were mostly sunny over the majority of the state, with the exceptions mainly over Kauai County and lower elevations of the Big Island. Winds were representative of a light to moderate trade flow, with sustained speeds averaging 10 to 15 mph, with a few gusts around 25 mph and the typical windy spots.

Relatively light trades and dry conditions will give way to increasing winds and moisture tonight into Tuesday, as a surface trough approaches from the east. This will bring an increase in showers, mainly windward and mountains. Precipitable values will increase tonight.

Aloft, a weak upper level low to our northeast will drift southwest and come near the state Wednesday into Wednesday night, before moving off to the northwest and then weakening through Sunday. This upper low will bring cooler air aloft, enhancing instability slightly for the coming week. This will lead to a deeper surface boundary and higher inversion, leading to stronger rain rates compared to the past few days. However, no widespread heavy rain is forecast. The impact will be mainly windward and mountains due to the strengthening trade winds.

North of our weak upper level low, an upper level ridge will help keep a strong surface high positioned to our northeast, off the coast of the mainland. This will keep the trades blowing at moderate to occasionally breezy levels into the weekend. Models indicate some drier air approaching Friday and Saturday, reducing the number and strength of showers.

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 evening: A weak high pressure ridge will remain nearly stationary north of the local waters, maintaining gentle to locally fresh trade winds through Tuesday. High pressure to the far north-northeast will strengthen by mid-week, causing easterly trade winds to 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 as early as Tuesday night, with the east to west passage of a low-level trough over the islands, contributing to enhanced winds behind the feature. The trough will also be accompanied by an increase in shower activity Tuesday and Wednesday. SCA conditions are then likely to continue through the end of the week.

A series of small to moderate, medium to long period south swells will keep surf along south-facing shores near seasonal average through the forecast period. A moderate, long-period swell is giving a slight boost to south shore surf, which is expected to continue through tonight, before fading on Tuesday. 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 wind energy upstream of the islands through tonight. Easterly choppy wind waves look to increase Tuesday into the end of the week, reaching moderate levels as trade winds increase. Surf along north-facing shores will remain flat to tiny through the forecast period, with a potential bump of 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:

Invest 94E

A tropical wave located a few hundred miles south-southwest of the coast of southwestern Mexico continues to produce a large area of disorganized showers and thunderstorms. This disturbance is forecast to move westward to west-northwestward at 10 to 15 mph across the central portion of the East Pacific basin, and some development is possible during the next couple of days before it moves into unfavorable environmental conditions 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, and it could become a tropical depression this weekend or early next week while it moves west-northwestward at 10 to 15 mph.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…40 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 

Invest 94E

A tropical wave located a few hundred miles south-southwest of the coast of southwestern Mexico continues to produce a large area of disorganized showers and thunderstorms. This disturbance is forecast to move westward to west-northwestward at 10 to 15 mph across the central portion of the East Pacific basin, and some development is possible during the next couple of days before it moves into unfavorable environmental conditions 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 478 NM south-southwest of Kadena AB

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

 

Tropical Cyclone 08W (Higos)…is located approximately 18 NM south of Tinian

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 and a high warming pathway. 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