The latest update to this website was at 803pm Monday (HST)

 

Here are the highest temperatures Monday…and the lowest Monday morning:

85 – 76  Lihue AP, Kauai
88 – 74  Molokai AP, Molokai
91 – 73  Kahului AP, Maui – Record Monday 95 / 2010
87 – 77  Kona AP, Big Island
83 – 69  Hilo, AP, Big Island

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

0.76  Waipa, Kauai
0.66  Poamoho RG 1, Oahu
0.38  Honolimaloo, Molokai
0.00  Lanai
0.38  West Wailuaiki, Maui
0.35  Kawainui Stream, Big Island

>>> There are lots of locations that measure rainfall and winds, here’s a map of all areas for your reference (the map is clickable to zoom in closer)

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

27  Port Allen, Kauai
37  Oahu Forest NWR, Oahu
31  Makapulapai, Molokai
31  Lanai 1, Lanai
39  Na Kula, Maui
35  Pali 2, Big Island

Hawaii’s Mountains – Here’s a link to the live webcams on the summit of our tallest mountain Mauna Kea (~13,800 feet high) on the Big Island of Hawaii, and atop the Haleakala Crater (~10,023 feet) 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/GOES17/ABI/SECTOR/tpw/13/GOES17-TPW-13-900x540.gif 

 Thunderstorms forming far south of the state


https://cdn.star.nesdis.noaa.gov/GOES17/ABI/SECTOR/hi/GEOCOLOR/GOES17-HI-GEOCOLOR-600x600.gif

Low clouds being carried our way on the trade winds…well developed cumulus clouds north of Kauai 

 

https://cdn.star.nesdis.noaa.gov/GOES17/ABI/SECTOR/hi/13/GOES17-HI-13-600x600.gif

High and middle level clouds arriving from the west

 

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

Localized showers 

 

https://www.weather.gov/images/hfo/satellite/Kauai_VIS_loop.gif

Kauai and Oahu (Satellite)

 

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

Kauai and Oahu (Radar)

 

https://www.weather.gov/images/hfo/satellite/Oahu-Maui_VIS_loop.gif

Oahu and Maui County (Satellite)

 

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

Oahu and Maui County (Radar)

 

https://www.weather.gov/images/hfo/satellite/Hawaii_VIS_loop.gif

 Maui, Kahoolawe, Lanai, and the Big Island (Satellite)

 

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

Maui County and the Big Island (Radar)

 

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

Big Island (Radar)

 

Model showing precipitation through 8-days (you can slow this animation down)

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 home here in upper Kula, Maui, Hawaii.

It’s clear to partly here in Maui County early this morning with a few high clouds and clouds along the windward side.  The low temperature at my place was 56 degrees.

1222pm, sunny to partly sunny with still some leftover haze from yesterday.

606pm, there’s a pretty thick cloud cover, consisting of both higher and lower level clouds. Meanwhile, there’s a fair amount of haze in our atmosphere as well. As the winds turn more towards the southeast in a few days, we could see thicker volcanic haze arriving from the vent on the Big Island.

Weather Wit of the day:  Summer – When kids wear much lighter clothing to watch television

>>> Highest Temperature Monday, July 21, 2025 – 115 at Stovepipe, CA
>>> Lowest Temperature Monday, July 21, 2025 – 32 at Foxpark, WY

 

Hawaii’s Broad Brush Weather Overview:  Moderate to locally breezy trade winds will prevail through much of the week, as periods of thin high clouds continue to pass overhead. On most days, showers will favor windward areas, and aside from scattered afternoon showers on the South Kona slopes of the Big Island, leeward areas will be mostly dry. On Wednesday, winds will decline and shift more easterly, leading to more widespread leeward sea breezes, and bringing higher chances for interior and leeward showers on mainly Kauai.

Hawaii’s Weather Details: A moderate to locally breezy and rather stable trade wind flow is in place. Broad surface high pressure far north of the state is driving the trades. A ridge aloft centered just south of the state is gradually building overhead, bringing increasingly stable conditions, and an upper-level trough sitting roughly 900 miles to the northwest of the islands, is sending thin high clouds over the area. Under these locally breezy and stable conditions, windward rainfall has decreased considerably, though Kauai remained slightly wetter.

Little change is expected through Tuesday. Locally breezy and rather stable trade winds will focus modest showers over windward areas, and with the exception of scattered afternoon showers over the South Kona slopes, leeward areas should be mostly dry. The pattern aloft will remain relatively unchanged, and patches of high clouds will continue to stream overhead.

Subtle changes are in store for Wednesday. The upper-level trough and its associated surface trough to the northwest of the state will strengthen, and a trough aloft will pass near Kauai. Winds across the western half of the island chain will veer easterly or possibly even out of the east-southeast as the inversion erodes. As a result, afternoon sea breezes could become more extensive and drive higher chances for leeward showers. Since there does not appear to be an influx of increased moisture, heavy showers appear unlikely at this time.

A return to stable summertime trade wind conditions is due on Thursday, as the surface and upper-level trough to the northwest weaken. Expect moderate easterly trade winds to bring typical showers to windward areas.

Fire weather:  Locally breezy, dry, and stable conditions have returned, and with winds blowing stronger than expected within a slot of dry air passing over the islands, weather observations at the Honolulu International Airport (HNL) have been hovering right around critical levels. Winds at other leeward sites are not as strong, and we will hold off on any headlines at this time. Expect similarly dry and stable conditions on Tuesday, with near critical winds and relative low humidity. East to east southeast winds on Wednesday will likely be lighter over sheltered leeward areas.

Here’s a near real-time Wind Profile of the Pacific Ocean – along with a Closer View of the islands / Vog map animation

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

 

Hawaii’s Marine Environment:  A high pressure ridge to build back into the area and strengthen trade winds into the moderate to locally strong range into Thursday. Lighter winds are forecast from Thursday night into the weekend.

Several pulses of southerly and southwesterly swells will continue to boost surf heights along south and some of the west facing shores this week.

Surf along east facing shores will remain small and choppy. Surf along north facing shores will remain nearly flat.

Peak high tides associated with the lunar cycle could lead to minor coastal flooding along shorelines and low lying coastal areas through Wednesday during the daily peak tide each afternoon.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean:  There are no active tropical cyclones

Central Tropical Atlantic:

Invest 94L

Shower and thunderstorm activity remains disorganized associated with a weak area of low pressure located about 800 miles east-southeast of the Lesser Antilles. Environmental conditions are forecast to become increasingly unfavorable for development during the next few days while the wave moves westward at around 15 mph.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…10 percent

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.

 

Northeastern Pacific: There are no active tropical cyclones

Well west-southwest of the Baja California Peninsula:

A trough of low pressure located well west-southwest of the Baja California peninsula is producing limited shower activity. The system is moving westward into an unfavorable environment, and development is no longer expected.

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

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

 

North Central Pacific:  There are no active tropical cyclones

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

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

 

Northwest Pacific Ocean: 

Tropical Cyclone 09W (Wipha)…is located 59 NM east-southeast of Hanoi, Vietnam

Official Forecast

Southwest Pacific Ocean:  There are no active tropical cyclones

North and South Indian Ocean:  There are no active tropical cyclones

Arabian Sea:  There are no active tropical cyclones

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

 

>>> Here’s a link to the Pacific Disaster Center’s (PDC Global) Weather Wall website

 

Interesting:  Inhaled Agricultural Dust Disrupts Gut Health

Inhaling agricultural dust may pose significant risks to gut health for workers in animal agriculture, a University of California, Riverside, study has found.

Led by Declan McCole, a professor of biomedical sciences in the UCR School of Medicine, the study expands on prior findings that hog farm dust causes airway inflammation. The researchers now report in the Journal of Applied Toxicology that inhaling this dust also alters the gut microbiome and impairs intestinal function, including increased “leaky gut” or intestinal permeability. Leaky gut is associated with a range of chronic diseases, including inflammatory bowel disease, celiac disease, and type 1 diabetes.

“Exposure to swine farm dust, which contains high levels of bacteria and endotoxins, caused both airway inflammation and increased passage of gut bacterial products into the bloodstream in our mouse models,” said Meli’sa Crawford, a former postdoctoral researcher in McCole’s lab and the paper’s first author. “But what’s especially striking is the impact we observed on the gut microbiome and metabolism.”

Read more at: University of California – Riverside