The latest update to this website was at 355pm Sunday (HST)

 

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

86 – 75  Lihue AP, Kauai
85 – 75  Molokai AP, Molokai
90 – 77  Kahului AP, Maui – Record high Sunday 97 in 1994
84 – 78  Kona AP, Big Island
84 – 69  Hilo, AP, Big Island

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

0.20  Mount Waialeale, Kauai
0.19  St. Stephens, Oahu
0.00  Molokai
0.00  Lanai
0.19  Hana AP, Maui
0.49  Papaikou Well, 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 Sunday afternoon:

09  Lawai, Kauai
18  Oahu Forest NWR, Oahu
08  Keopukaloa, Molokai
06  Lanai 1, Lanai
21  Na Kula, Maui
16  South Point, 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/GOES18/ABI/SECTOR/tpw/13/1800x1080.jpg

Thunderstorms south…cold fronts far north…Tropical Cyclone Kiko far east-southeast towards Mexico

 

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

Low clouds…higher clouds arriving from the southwest…towering cumulus south 

 

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

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

Showers locally 

 

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

 

~~~ Hawaii Weather Narrative ~~~

 

Glenn’s Sunday comments:  I’m home here in upper Kula, Maui, Hawaii.

It’s partly to mostly cloudy here in Maui County early this morning. The low temperature at my place was 63 degrees…with a relative humidity of 72%.

1237pm, it’s remained cloudy all morning, and now I just felt a drop of rain…humidity has risen to 77%. It remains partly sunny down closer to the coasts. Skies remain on the hazy side here on Maui, and our trade winds have down shifted a notch or two as well.

225pm, it’s way cloudy and rather dark for the middle of the afternoon, somewhat cool as well with a light shower falling.

Weather Wit of the day:  Rain Shower – Something with a beginning, and puddle and an end

>>> Highest Temperature Sunday, August 31 , 2025 – 116 at Death Valley, CA
>>> Lowest Temperature Sunday, August 31, 2025 – 26 at Peter Sinks, Utah

For you full-on weather nerds out there, like me, here’s a great new blog by a friend of mine, Kevin Kodama, the former Senior Service Hydrologist at the NWSFO in Honolulu…Mauka Showers

 

Hawaii’s Broad Brush Weather Overview:  Beneath a persistent blanket of high clouds, moderate trades deliver limited low clouds and showers to windward and mountain areas for the remainder of the new week.

Hawaii’s Weather Details: Water vapor imagery clearly shows a closed upper low parked northwest of Kauai, drawing north a plume of moisture from the deep tropics. A weakened trade wind inversion around 8,000 feet is observed, which matches well with radar-indicated shower tops penetrating to 10,000 feet or so. Interior showers developed over the islands in response to daytime heating, with the resident envelope of low-level moisture, but they have largely been disorganized.

This is likely a consequence of high clouds limiting the sea breeze. The lack of organized surface convergence has therefore translated into a lack of shower organization. Interior areas will clear tonight giving way to clear skies in the lower levels, and high clouds aloft with light to moderate trades delivering pockets of showers windward and mountain areas through the night.

The latest modeling suggests today will represent the minimum in winds for the week, though not by much, as the trade wind belt rebounds slightly northward, and the upper low northwest of Kauai gradually lifts north away from the islands. Moderate, stable trades are forecast to prevail through the end of the forecast period. Rainfall remains limited as drier air returns early this week.

Fire weather:  Moderate trades prevail for the remainder of the new week, delivering limited showers windward and mountains. Modest drying commences Monday, as the resident area of low-level moisture exits to the west and dewpoints return to typical values in the upper 60’s.

Here’s a near real-time Wind Profile of the Pacific Ocean – along with a Closer View of the islands / Vog map animation / 8-Day Precipitation model

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

 

Hawaii’s Marine Environment:  A ridge of high pressure north of the state will gradually shift further south in response to a developing low far north of the state. As the ridge meanders closer to the islands our trade wind speeds will decrease, with gentle to moderate trades expected through early in the new week. Winds should be light enough for localized sea breezes, especially across leeward waters.

Surf along south facing shores is expected to steadily decline through Monday as the swell fades, returning to background levels early in the week.

Surf along north facing shores will see a small, short-period swell arriving. This swell will be overshadowed by longer period energy out of the northwest starting Monday night, peaking on Tuesday. Another reinforcing pulse out of the north should arrive around the same time the northwest swell arrives. A mix of north and northwest swells are expected Tuesday through Thursday.

Below average surf is expected to continue along east facing shores persisting through early in the new week.

Peak monthly high tides, combined with water levels running higher than predicted, may lead to minor flooding along the shoreline and in low-lying coastal areas toward the end of the week. Coastal flooding may be possible around the daily afternoon peak tide.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean: There are no active tropical cyclone

Eastern Tropical Atlantic

 >>> A tropical wave is now moving westward from the west coast of Africa. Environmental conditions are conducive for slow development of this system while it moves westward to west-northwestward at around 15 mph across the eastern and central tropical Atlantic this week.

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

 

Caribbean Sea:  There are no active tropical cyclone

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:

Tropical Cyclone Kiko

KIKO MOVING WESTWARD WITH LITTLE CHANGE IN STRENGTH

According to the NHC advisory number 3

Kiko is moving toward the west near 9 mph and this motion is expected to continue over the next few days. Maximum sustained winds are near 40 mph with higher gusts. Strengthening is expected during the next couple of days, and the system is forecast to become a hurricane by Tuesday. Tropical-storm-force winds extend outward up to 35 miles from the center.

cone graphic

 

South of Southern Mexico:

>>> A tropical wave is producing a large area of disorganized showers and thunderstorms south of southern Mexico. An area of low pressure is expected to form from this system within the next day or two, and it is likely to become a tropical depression by the middle of this week while moving west-northwestward or northwestward at 10 to 15 mph just offshore of the southwestern coast of Mexico.

* Formation chance through 48 hours…medium…50 percent
* Formation chance through 7 days…high…80 percent

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

 

North Central Pacific: There are no active tropical cyclone 

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:  There are no active tropical cyclones

Southwest Pacific Ocean:  There are no active tropical cyclones

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

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:  New Study: Coastal Waves Create More Aerosols Than Expected – May Affect Climate and Air Quality

A new discovery about how sea spray forms on coastlines may change our understanding of the oceans’ impact on climate. In coastal areas, aerosol concentrations have been greatly underestimated — but globally, they may have been overestimated. The findings, from a study that included a researcher at Stockholm University, could also affect air quality in coastal cities. And it all began during a car journey on a windless day in the Azores.

The small island of Graciosa in the Azores is home to one of the US Department of Energy’s many atmospheric measurement stations. The continuous measurements taken at these stations form a large part of the basis for what we know today about climate change. They capture not only the effects of greenhouse gases but also the role of cloud-forming aerosols from land and sea.

Matthew Salter, a researcher at Stockholm University, had been studying aerosols and their effects for a long time when he visited the Azores in the summer of 2022 to see how a research campaign led by his PhD students, together with American collaborators, was progressing. On a beautiful, almost windless summer’s day, he and some colleagues drove across Graciosa to reach the observatory at its northernmost point. Although it was almost windless on the island, high waves were crashing against the coast and the air was filled with sea spray.

Read More: Stockholm University