The latest update to this website was at 823pm Tuesday (HST)

 

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

0.02  Lihue AP, Kauai
0.09  Moanalua RG, Oahu
0.10  Puu Alii, Molokai
0.00  Lanai
0.19  West Wailuaiki, Maui
0.28  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 Tuesday evening:

27  Port Allen, Kauai
35  Kuaokala, Oahu
31  Makapulapai, Molokai
29  Lanai 1, Lanai
54  Na Kula, Maui
37  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/GOES18/ABI/SECTOR/tpw/13/GOES18-TPW-13-900x540.gif

 Thunderstorms in the deeper tropics…cold fronts far north…dissipating Tropical Cyclone Mario far east-northeast towards Baja, California

 

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

Well developed cumulus clouds and a few thunderstorms south of the Big Island

 

 

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 Tuesday comments:  I’m home here in upper Kula, Maui, Hawaii.

It’s clear to partly cloudy here in Maui County early this morning. The low temperature at my place was 53.5 degrees…with a relative humidity of 78%.

1228pm, sunny to partly sunny, with some cloudy areas over and around the slopes.

346pm, clouds have gathered over and around the mountains here in Maui County, with sunshine still beaming down along the coastal areas.

Weather Wit of the day: Due Respect – To have admiration for wet grass

>>> Highest Temperature Tuesday, September 16, 2025 – 111 at Death Valley, CA
>>> Lowest Temperature Tuesday, September 16, 2025 – 21 near Mackay, Idaho

 

Hawaii’s Broad Brush Weather Overview: A stable and relatively dry pattern will persist through Thursday, along with moderate to locally breezy trade winds, bringing limited clouds and showers to windward and mountain areas. Increased shower activity is expected Thursday night into the weekend. A return to a more stable trade wind pattern is expected early next week.

Hawaii’s Weather Details: Regional satellite imagery shows a modest field of low clouds embedded within the moderate to locally breezy trades focusing mainly along the windward and mountain areas. In addition, onshore flow has brought a build up of clouds and a few showers across the Kona slopes of the Big Island.

Rain gauges have collected only a few hundredths of an inch across favored windward slopes. No significant change in sensible weather is expected through Thursday, given a lack of substantial upstream moisture and continued stable conditions as a firm inversion remains in place.

Attention then turns to the potential for a more active shower pattern late Thursday night into the weekend. A decaying surface trough far east of the islands, and the tail end of a weakening front to the north, will be pinched off beneath strengthening high pressure. Moisture from these features will be drawn into the trade wind flow and bring a boost in showers across the state beginning late Thursday night, with precipitable water values climbing towards 2 inches by Friday night into Saturday.

At the same time, a mid- to upper-level low is forecast to set up near Kauai. Forecast soundings show the trade inversion lifting to near 10,000 feet or higher as deeper moisture arrives. While lapse rates will steepen enough to support some conditional instability, a distinct surface trigger appears to be lacking.

Even so, the combination of deeper moisture and cooler mid-level temperatures will allow for locally heavier showers and the potential for a few embedded thunderstorms, especially across the western half of the state Friday into Saturday. Any heavier cells should remain fast moving within the persistent trades, limiting the duration of heavy rainfall at any one location.

Showers will gradually diminish late Sunday into early next week as upper ridging reestablishes and drier air filters back across the islands.

Fire weather:  Expect decreasing fire weather risk as humidity gradually increases through the week into the weekend. Rain chances will increase Thursday night into the weekend as deep pockets of moisture filter in on the trades, helping to potentially further alleviate fire weather concerns. Sustained winds briefly hover near to below the critical fire weather threshold each afternoon through Thursday, then trend slightly lighter for the weekend.

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:  Weak high pressure north of the state will become reestablished by mid-week. This will result in small fluctuations of trade wind speeds across the coastal waters for the next several days, but they will generally remain in the moderate to locally strong range. A Small Craft Advisory (SCA) that is in effect for the windier channels and waters around Maui and the Big Island through Wednesday afternoon.

North shore surf will hold at tiny levels for the next several days. A gale low that is currently in the Gulf of Alaska is expected to send a minor north swell towards Hawaii later this week, resulting in a small rise in surf heights for north facing shores beginning on Thursday. An additional small northwest reinforcement is expected by the weekend.

The current small, medium period south swell will gradually decline through mid-week. A couple of very small reinforcements are expected throughout the next several days, though surf will remain small. A slightly larger long period swell, generated from gales and near-gales aimed at Hawaii this past weekend near New Zealand, is forecast to arrive in the islands by Friday night. This swell will boost south shore surf back up to near September averages during the weekend.

East facing shores will experience 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:

Invest 92L

>>> Satellite wind data indicate that the low pressure system located about midway between the Windward Islands and the Cabo Verde Islands is gradually becoming better defined. In addition, the associated shower and thunderstorm activity has become a little more concentrated during the past several hours. If these trends continue, advisories could be initiated on a tropical depression later today. The system is expected to move generally northwestward at 10 to 15 mph over the central tropical and subtropical Atlantic during the next several days.

* Formation chance through 48 hours…high…90 percent
* Formation chance through 7 days…high…90 percent

 

Eastern Tropical Atlantic:

>>> A tropical wave located a couple of hundred miles east-southeast of the Cabo Verde Islands is producing an area of disorganized showers and thunderstorms. Environmental conditions are only marginally conducive, and any development of this system should be slow to occur while it moves westward at 15 to 20 mph across the eastern and central portion of the tropical Atlantic. Regardless of development, this system will likely bring areas of heavy rain across the Cabo Verde Islands later today and Thursday.

* Formation chance through 48 hours…low…10 percent
* Formation chance through 7 days…low…20 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:   

Post-Tropical Cyclone Mario…is located about 535 miles west of the southern tip of Baja California – Last Advisory

MOISTURE FROM MARIO COULD AFFECT THE SOUTHWESTERN UNITED STATES BY THURSDAY

According to the NHC advisory number 18

The post-tropical cyclone is moving toward the northwest near 10 mph, and this general motion is expected to continue with a decrease in forward speed over the next day. Maximum sustained winds have decreased to near 30 mph with higher gusts. The remnants of Mario will continue to weaken, with dissipation expected by Thursday. The estimated minimum central pressure is 1006 mb (29.71 inches).

 

Off the coast of Southwestern Mexico:

Invest 96E

>>> A broad area of low pressure located a few hundred miles off the coast of southwestern Mexico is producing a large area of showers and thunderstorms. Environmental conditions appear conducive for gradual development of this broad system, and a tropical depression is likely to form in a couple of days while it moves west-northwestward at 10 to 15 mph over the central portion of the east Pacific.

* Formation chance through 48 hours…high…70 percent
* Formation chance through 7 days…high…90 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: 

Tropical Cyclone 23W…is located approximately 146 NM north-northeast of Manila, Philippines

https://www.metoc.navy.mil/jtwc/products/wp2325.gif

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:  Arctic-Bound Birds Can Still Keep Up With Climate Change – For Now

As climate change drives earlier spring conditions in the Arctic, birds species that travel there to breed there are under pressure to migrate faster. A new study led by researchers from the University of Amsterdam and the Netherlands Institute of Ecology reveals that many Arctic-breeding waterfowl still have some flexibility when it comes to speeding up their migrations. However, this strategy may only work for a limited time.

The study, published on 9 September in Nature Climate Change, GPS-tracked over 500 spring migrations of five large waterfowl species: brent geese, barnacle geese, greater white-fronted geese, pink-footed geese and Bewick’s swans. Combining the tracking data with long-term body mass data collected from birds in their wintering grounds, the researchers discovered that these birds can reduce the time spent fueling for their journey, allowing them to arrive earlier in the Arctic.

‘Our results are both encouraging and concerning,’ said lead author Hans Linssen. ‘We show that these birds can migrate faster by adjusting their stopovers and feeding times. But the clock is ticking if we look at the current rates of Arctic warming – this flexibility will only compensate for the advancing Arctic spring for a few more decades.’

Read More: Universiteit van Amsterdam