The latest update to this website was at 1225pm Monday (HST)

 

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

0.02  Mount Waialeale, Kauai
0.02  Moanalua RG, Oahu
0.00  Molokai
0.00  Lanai
0.06  West Wailuaiki, Maui
0.06  Kaiholena, 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 afternoon:

23  Port Allen, Kauai
33  Kuaokala, Oahu
28  Molokai AP, Molokai
28  Lanai 1, Lanai
46  Kealaloloa Rg, Maui
28  Hokuloa, 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/GOES18-TPW-13-900x540.gif

 Thunderstorms in the deeper tropics…cold front far north…Tropical Cyclone Mario far east towards Mexico 

 

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

Higher clouds moving over the state from the west locally…and to the south  

 

 

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

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

Showers locally…very  few 

 

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 partly cloudy here in Maui County early this morning. The low temperature at my place was 55 degrees…with a relative humidity of 78%.

Mauka Showers…Windward Big Island Drought

Weather Wit of the day: Two mother kangaroos were talking and one said to the other, “Don’t you just hate these rainy days when the kids can’t go out and play?”

>>> Highest Temperature Sunday, September 14, 2025 – 108 at Death Valley, CA
>>> Lowest Temperature Monday, September 15, 2025 – 27 near Creede, Colorado

 

Hawaii’s Broad Brush Weather Overview: High pressure ridging north of the Hawaiian Islands and a weak low propagating westward south of the islands, will maintain stable weather conditions under moderate to locally breezy trades throughout the day.

A shift in weather begins Tuesday, as a brief increase in shower activity is expected, as a batch of deeper moisture meanders into the vicinity of the state. For the latter end of the week through the weekend, expect periods of showers with increased cloud coverage associated with another batch of deep moisture.

Hawaii’s Weather Details: Broad area of high pressure and associated ridging remains quasi-stationary just north of the Hawaiian Islands, as a weak low pressure system continues to propagate westward south of the state, producing a tight pressure gradient responsible for increased wind speeds. Stable conditions will maintain a relatively dry late summer weather pattern, with moderate to locally breezy trades through the day today, decreasing slightly through early Wednesday.

As the week progresses thereafter, trades increase slightly, as well as bringing an uptick in shower activity and increasing cloud coverage, as an area of deeper moisture moves into the vicinity of the islands, primarily impacting windward and mountain areas, however, leeward areas may see some of the stronger trade wind showers. That said, these showers will dissipate as quickly as they arrive, and overall moisture content will be limited.

Latest model guidance suggests unsettled weather conditions continue Thursday, persisting through much of the weekend. Guidance depicts a frontal system extending well north from the Gulf of Alaska and extending southward south of 40N latitude. This front will perpetuate trades with deeper moisture ahead of the aforementioned high pressuring pinching off the tail-end, pivoting this moisture toward the vicinity of the islands.

The excess deeper moisture will coincide with the latter end of this week’s forecast temperature inversion levels, situated around the 7,000 foot elevation level, supportive of isolated to scattered showers throughout the day, and scattered to numerous showers overnight through the weekend. While the increase trade wind shower coverage will mostly fall across windward and mountain areas, it cannot be ruled out that leeward areas may see brief spillovers.

Fire weather:  Low humidity levels persist with sustained winds just under critical fire weather thresholds for a few hours this afternoon. Expect decreasing fire weather concerns beginning Tuesday onward through the forecast period as minimum humidity levels increase.

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:  Moderate to locally strong trades expected. A high to the north will weaken slightly on Tuesday allowing trades to ease. Winds should restrengthen by mid-week bringing back a SCA.

The recent small, medium period north swell will slowly decline. Another medium period north swell is expected to arrive Thursday, and may cause a slight bump in surf along north-facing shores.

A small, medium- to long-period south swell will keep surf along south-facing shores near the September averages gradually declining tonight through mid-week. A couple of very small reinforcements are expected throughout the week, though surf will remain small. A slightly larger, long-period swell is forecast to arrive in the islands Friday night, boosting south shore surf by the weekend.

East facing shores will see typical trade wind generated energy throughout the forecast period.

 



World-wide Tropical Cyclone Activity

 

Atlantic Ocean:  There are no active tropical cyclone

Central Tropical Atlantic:

A broad area of low pressure has formed roughly midway between the Windward Islands and the coast of west Africa. This system has become better organized since yesterday and is expected to move through a favorable environment for further development. A tropical depression or tropical storm is likely to form by the middle to latter part of this week as the system moves west-northwestward at 10 to 15 mph over the central tropical Atlantic.

* Formation chance through 48 hours…medium…50 percent
* Formation chance through 7 days…high…90 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 Mario…is located about 260 miles west-northwest of Socorro Island

MARIO A LITTLE STRONGER WHILE IT MOVES NORTHWESTWARD

According to the NHC advisory number 13

Mario is moving toward the northwest near 13 mph, and this general motion with some decrease in forward speed is forecast during the next few days. Satellite imagery indicates that the maximum sustained winds have increased to near 65 mph with higher gusts. Little change in strength is forecast today, with weakening likely to begin on Tuesday. Mario is anticipated to become a post-tropical cyclone on Wednesday. Tropical-storm-force winds extend outward up to 45 miles from the center. The estimated minimum central pressure is 993 mb (29.33 inches).

 

Off the coast of Southwestern Mexico:

>>> An elongated trough of low pressure located several hundred miles off the coast of southern Mexico is producing disorganized showers and thunderstorms. Environmental conditions appear conducive for gradual development of this system, and a tropical depression is likely to form by the middle to latter part of this week as it moves west-northwestward at 10 to 15 mph over the central east Pacific.

* Formation chance through 48 hours…low…30 percent
* Formation chance through 7 days…high…70 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:  Scientists Uncover Extreme Life Inside the Arctic Ice

For the first time, researchers report that Arctic algae can hustle along in -15 C – the lowest-temperature movement ever recorded in complex, living cells. This discovery raises new questions about how algal communities regulate the overall health of the Arctic environment.

If you pull an ice core from the outer edges of the Arctic polar cap, you might spot what looks like a faint line of dirt. Those are diatoms – single-celled algae with outer walls made of glass. Their presence in ice isn’t new, but because they seemed trapped and dormant, few bothered to study them.

But new research from Stanford, published in Proceedings of the National Academy of Sciences, revealed Arctic diatoms aren’t immobile or entombed. They’re not just surviving either – they’re gliding into the record books.

“This is not 1980s-movie cryobiology. The diatoms are as active as we can imagine until temperatures drop all the way down to -15 C, which is super surprising,” said Manu Prakash, associate professor of bioengineering in the Schools of Engineering and Medicine and senior author of the paper.

Read More: Stanford University

Image: Image of an Arctic diatom, showing the actin filaments that run down its middle and enable its skating motion.