West Kaua’i

Rest Of Tonight: Partly cloudy. Scattered showers in the evening, then isolated showers after midnight. Lows around 74 near the shore to around 65 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 40 percent.

Tuesday: Mostly sunny in the morning then becoming partly sunny. Scattered showers. Highs 86 to 93 near the shore to around 78 above 3000 feet. North winds up to 10 mph shifting to the southwest in the afternoon. Chance of rain 50 percent.

Tuesday Night: Mostly cloudy with scattered showers. Lows around 76 near the shore to around 66 above 3000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.

South Kaua’i

Rest Of Tonight: Breezy. Partly cloudy with scattered showers. Lows 72 to 77. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Tuesday: Breezy. Partly sunny with scattered showers. Highs 79 to 91. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Tuesday Night: Breezy. Mostly cloudy with scattered showers. Lows 74 to 79. Northeast winds 10 to 20 mph decreasing to up to 15 mph after midnight. Chance of rain 50 percent.

Kaua’i Mountains

Rest Of Tonight: Mostly cloudy. Scattered showers in the evening, then numerous showers after midnight. Lows around 70 in the valleys to around 61 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Tuesday: Mostly cloudy with numerous showers. Highs 75 to 82 in the valleys to around 69 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 70 percent.

Tuesday Night: Mostly cloudy. Showers in the evening, then numerous showers after midnight. Lows around 71 in the valleys to around 62 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 90 percent.

North Kaua’i

Rest Of Tonight: Mostly cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 65 to 75. East winds 10 to 15 mph decreasing to up to 15 mph after midnight. Chance of rain 70 percent.

Tuesday: Mostly cloudy. Scattered showers in the morning, then numerous showers in the afternoon. Highs 72 to 87. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday Night: Mostly cloudy with numerous showers. Lows 66 to 76. Northeast winds up to 15 mph. Chance of rain 70 percent.

East Kaua’i

Rest Of Tonight: Mostly cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 68 to 76. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday: Mostly cloudy with numerous showers. Highs 79 to 87. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Tuesday Night: Mostly cloudy with numerous showers. Lows 70 to 79. North winds 10 to 15 mph. Chance of rain 70 percent.

Detailed Forecast

Synopsis

Moderate to breezy trade winds produced by strong high pressure far northwest of the Hawaiian Islands will increasingly back northeast ahead of an approaching Hurricane Fausto tonight into Tuesday. Shower activity should also experience an uptick, but continue to favor windward mountain areas through early Tuesday. As Fausto passes north of the Hawaiian Islands on Tuesday and Wednesday as a tropical storm, diminishing winds for the islands could allow for sea breezes and heavy afternoon rain showers. A drier, breezy trade wind weather pattern will return across the state from Thursday onward as Fausto drifts westward away from the Hawaiian Islands.

Short term update

An increase in clouds and showers are occurring over the state. Most of the showers are over and along windward and mauka locations. Some showers are carrying over into leeward spots. Both PoPs and Sky were adjusted to reflect this. No other changes were made. It is important to note that Fausto is now a Tropical Storm and will continue to weaken as it continues west- northwestward.

Prev discussion

Issued at 359 PM HST Mon Jul 27 2026
Satellite imagery and radar reveals bands of showers entering the coastal waters from the northeast as increased moisture associated with Hurricane Fausto begins to move into the Hawaiian Islands. These showers will begin to move onshore this evening, increasing precipitation for windward and mauka locations through Tuesday morning. Total rainfall amounts could amount to up to half an inch to one inch of rain for localized mauka areas. Dew points are already increasing into the lower to mid 70s this afternoon, which will make for muggy conditions through Wednesday whilst Fausto passes north of the islands as a tropical storm.
Fausto's passage to the north will also act to actually reduce winds for the islands, which should allow for the development of a sea breeze regime for the Big Island and possibly Maui County as well on Tuesday. With the more saturated air, heavy rain showers will be possible in the afternoon/evening for locations where the synoptic-scale winds weaken enough to give way to the sea breeze. Backed northeasterly trade winds are more likely to persist ahead of the cyclone for Oahu and Kauai, which will keep a more typical windward and mauka shower pattern.
Tuesday night, fairly weak winds and the potential for land breezes should actually lead to more limited shower activity despite the increased moisture and proximity of the tropical storm. Southwesterly shear will tend to push the heavier precipitation associated with the weakening storm north and east of the center, away from Hawaii. On Wednesday, another day of relatively weak winds will lead to further potential for sea breezes and heavy rain showers, this time including Oahu and Kauai.
At this stage, subtle shifts in forecast track may still occur that would affect the specific island by island impacts from Fausto. We strongly encourage the public to pay close attention to this passing storm system as weather impacts over the Hawaiian Islands will evolve the closer Fausto gets.
High confidence Fausto impacts include: warning-level high surf warning for east facing shores through Tuesday. A High Surf Warning is already in effect for east facing shores through Wednesday. Lesser confidence impacts include: strong winds to around 40 mph near and north of the low center and possible heavy rain threats from Tuesday through Wednesday.
No time like the present to review your family hurricane preparedness plans, and ensure every household has at least a 14 day supply of food and water available if needed during this years active hurricane season.
By Wednesday night, the cyclone continues on a west- northwest track and begins to gain distance from the islands, which will induce moderate to breezy southeast to easterly winds. From Thursday onward, a drier and more stable breezy trade wind pattern is set to return.

Aviation

This evening, numerous low clouds and showers are moving into north through east sections of all islands. Latest surface observations and satellite imagery show widespread MVFR ceilings and visibilities, with isolated IFR conditions. As a result, AIRMET Sierra has been issued for mountain obscuration for windward sections of all islands. This AIRMET will likely remain in place throughout the night. Should IFR conditions become a bit more widespread, this AIRMET may need to be upgraded.
Meanwhile, as Tropical Storm Fausto draws closer (but remains north of the islands), trade winds will weaken and become more northeasterly tonight and Tuesday over the eastern end of the state, followed Oahu and Kauai Tuesday night. As light southeast to south winds will develop and spread over the state from east to west, sea-breeze induced showers will increase. MVFR or isolated IRF conditions are possible in heavier showers, but otherwise, VFR flight conditions are expected to prevail. Aviation interests near the Hawaiian Islands should monitor updates to TC SIGMET Sierra, which covers Fausto, as the system passes north of the islands over the next few days.

Marine

Moderate to fresh NNE winds will be in place tonight as Hurricane Fausto enters the far northeast offshore waters. Winds will become more north and decrease tonight into Tuesday as Fausto moves through the northeast and northern offshore waters. As Fausto passes by, winds will be light and variable over the coastal waters, followed by south, then southeast immediately in its wake. As Fausto moves off to the northwest and high pressure builds to the north, east- northeast trades will build back in on Thursday then strengthen to fresh to locally strong levels on Friday into the weekend. A Small Craft Advisory (SCA) remains in effect for the winder waters and channels around Maui County and the Big Island through the remainder of the afternoon. Additionally a SCA is now in effect for the windward waters due to the east swell through Tuesday night.
Nearshore buoys on the eastern side of the islands have shown a considerable uptick with the medium and long period energy from Fausto. The surf is expected to continue building through the evening and then peak tomorrow before dropping off Wednesday afternoon. A High Surf Warning for east facing shores is currently in effect through Wednesday afternoon. East shore surf will then trend back up Friday into the weekend due to a combination of rising trade wind swell and a new long period east swell generated by Hurricane Genevieve.
A series of south swells will keep south shore surf near the summertime average (5-6ft) through the week.
Surf along N shores could also see some brief increase as Fausto (or its remnants) pass near the region Tuesday and Wednesday, then return to typical flat to tiny levels late Wednesday into the weekend.

HFO Watches/Warnings/Advisories

High Surf Warning until 6 PM HST Wednesday for Big Island East, Big Island North, Big Island Southeast, East Honolulu, Kauai East, Kipahulu, Koolau Windward, Maui Windward West, Molokai Southeast, Molokai Windward, Olomana, Windward Haleakala.
Small Craft Advisory until 6 AM HST Wednesday for Alenuihaha Channel, Big Island Southeast Waters, Big Island Windward Waters, Kaiwi Channel, Kauai Northwest Waters, Kauai Windward Waters, Maui County Windward Waters, Oahu Windward Waters, Pailolo Channel.

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Data Courtesy of NOAA.gov