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

 

The latest update to this website was at 6pm Monday evening HST


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

1.83  Kilohana, Kauai
0.16  Moanalua RG, Oahu
0.13  Puu Alii, Molokai
0.00  Lanai
1.03  Puu Kukui, Maui
1.17  Waiaha Stream, Big Island


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

29  Port Allen, Kauai – NE
30  Honolulu AP, Oahu – NE 
28  Molokai AP, Molokai – NE
39  Lanai 1, Lanai – NE
29  Veterans Hwy, Maui – NW
30  Kealakomo, Big Island – NNE


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 (out of operation). 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 south…cold front far northwest 

 

https://cdn.star.nesdis.noaa.gov/GOES18/ABI/SECTOR/hi/GEOCOLOR/20261941810-20261950200-GOES18-ABI-HI-GEOCOLOR-600x600.gif

Variable low clouds…high clouds moving over the state from the southwest

 

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

504am, it’s mostly clear with some high cirrus clouds here in upper Kula with calm winds, and a low temperature at my place of 52.5 degrees…with the relative humidity 78%

1220pm, I’m just back from my quarterly Dermatology appointment in Kihei, in which I came back skin cancer free…thank goodness! It’s partly cloudy with both low and high level clouds in our local skies.

454pm, clear to partly cloudy in general here in Maui County. It was a rather hot day, especially down at sea level, although cooler here in upcountry Kula…which is why after living here for 50 years, I’ve settled down here at my current location. I prefer the cooler temperatures and great views of the bi-coastal view from my deck.

 

>>> Highest Temperature Monday, July 13, 2026 – 110 at Stovepipe Wells, CA
>>> Lowest Temperature Monday, July 13, 2026 – 35 degrees at Peter Sinks, Utah

 

Interesting Web Blog: Mauka Showers…Hawaii’s 2026 Dry Season – A Midpoint Update

 

Hawaii’s Weather Highlights…as of Monday evening: Locally breezy trade winds will ease to moderate levels Tuesday and Wednesday, then strengthen Thursday into the weekend. Showers will continue to favor windward and mountain areas, with a slight increase in moisture expected Tuesday and Wednesday.

Weather Commentary…as of Monday evening: Locally breezy trade winds are on a gradual decline. The surface high driving the trades remains quite strong at 1033 millibars far north of Hawaii, but a weak mid-level trough just northeast of the islands, is beginning to erode the local pressure gradient and resulting trades. As the trough drifts westward through tonight, trades will continue a gradual decline.

Even with the mid-level trough nearby, stable conditions will persist, keeping showers focused across typical windward and mountain areas. The greatest amount of rainfall will continue to be on windward Big Island into tonight, though a band of active showers will approach by daybreak Tuesday.

A noticeable decrease in trade winds will occur Tuesday and Wednesday. The position of the surface high will change little, but the mid-level trough will drift westward over the islands, leading to a weakening of the local pressure gradient and resulting trades.

Guidance suggests that moisture riding along the moderate trade wind flow will keep windward shower activity somewhat enhanced, and localized sea breezes may produce clouds and a few showers across leeward terrain each afternoon as well.

Trade winds should rebuild Thursday and Friday as the mid-level trough moves away. Another factor in the the restrengthening trade winds could be development of a tropical cyclone far south of Hawaii. At this time, it does not appear that any of the potential tropical cyclone activity would directly impact the islands during the coming week.

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: The trades will gradually ease through Tuesday as the high pressure north of the islands lifts northeast and weakens. A Small Craft Advisory (SCA) is now in effect for most waters through 6pm, and for a smaller subset of the typically more windy waters through 6am Tuesday. The SCA will likely not be needed for any waters Tuesday, as winds should have decreased to below headline thresholds. These lighter trades should continue through Wednesday night, then may increase a bit Thursday and Friday, as high pressure northeast of the islands drops a bit further south and tightens up the local pressure gradient.

The current small, long-period southwest swell will peak today, then gradually decline through the middle of the week. A series of overlapping small south and southwest swells will then give a small boost to the surf along south facing shores Thursday through the upcoming weekend, with perhaps a more sizable south swell moving in early next week.

Surf along east-facing shores will remain rough and choppy, then steadily decline through the middle of the week. Surf will then hold steady at slightly below normal levels along east facing shores late in the week through the weekend.

A series of small, long to medium period west to west-northwest swells generated by former Typhoon Bavi will be possible throughout the week. Otherwise, no significant north or northwest swells are expected, so surf along north-facing shores is expected to remain flat to tiny.

Peak monthly high tides combined with water levels that are running slightly higher than predicted, will lead to minor flooding along the shoreline and in low-lying coastal areas. Coastal flooding is possible around the daily peak tide, which will be during the afternoon hours. A Coastal Flood Statement remains in effect through Tuesday afternoon.

 

Natural Features and Ecosystems - Hawai'i (U.S. National Park Service)


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 cyclones

>>> Offshore of Southwestern Mexico:

A tropical wave is producing a large area of disorganized thunderstorms and gusty winds a couple of hundred miles south of the coast of southwestern Mexico. Environmental conditions appear favorable for continued development, and a tropical depression is expected to form over the next couple of days while the system moves generally west-northwestward, staying offshore the coast of Mexico.

* Formation chance through 48 hours…high…80 percent
* Formation chance through 7 days…high…90 percent 

 

Offshore of Southern and Southwestern Mexico:

An area of low pressure is expected to form by the middle of the week several hundred miles south of the coast of southern Mexico. Environmental conditions appear conducive for gradual development of this system thereafter, and a tropical depression could form by the end of the weekend while it moves generally west-northwestward well offshore of Mexico.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…medium…60 percent

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

 

Central Pacific: There are no active tropical cyclone

>>> Well South of the Hawaiian Islands:

Invest 91C

Showers and thunderstorms have been persisting near the center of a broad area of low pressure located several hundred miles south of the Hawaiian Islands. Recent satellite-derived wind data indicate that the system is producing a small area of near gale-force winds, mainly in gusts, over its southeastern side. However, the system lacks a well-defined surface circulation. If the circulation becomes better defined, a tropical depression or tropical storm could form over the next day or two while the system moves little. The disturbance is expected to move into less favorable environmental conditions later this week, likely ending the chances of development.

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

 

>>> Well Southwest of the Hawaiian Islands:

Invest 90C

A trough of low pressure located several hundred miles to the southwest of the Hawaiian Islands continues to produce an area of disorganized showers and thunderstorms. Environmental conditions appear favorable for gradual development, and it could become a tropical depression later in the week as it moves slowly northwestward, remaining well southwest of the Hawaiian Islands.

* Formation chance through 48 hours…low…20 percent
* Formation chance through 7 days…medium…50 percent

 

>>> Northwest Pacific Ocean:  There are no active tropical cyclones

>>> 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:  Plants Get Wearables to Track Their Health

With new sensors, farmers could use real-time information to manage crop conditions before visible signs of plant stress appear.

A smartwatch can tell us the level of oxygen in our blood, when our sleep is restless, or the number of steps we take in a day. Now imagine that kind of tracking ability for plants.

By the time farmers see curling leaves or stunted growth in their fields, their crops may already have spent days under stress. A new innovation in plant “wearable” sensors aims to catch those distress signals earlier—before the plant visibly suffers, allowing farmers to respond and help their crops thrive.

In a recent study, researchers created tiny tattoo-like sensors that adhere to leaf surfaces and a stretchable band that wraps around stems. Together, they track two vital signs of plant life—the temperature and humidity beneath the leaf’s surface, and whether the stem is still growing. Even more striking, the system runs without an external battery, scavenging power from moisture evaporating from the plant itself.

Read More: Tufts University

Image: “The leaf sensor is more of an early warning system showing how the plant is responding in the moment, before visible signs appear,” said Nafize Hossain.