West Kaua’i

Rest Of Tonight: Mostly cloudy with scattered showers. Lows around 63 near the shore to around 52 above 3000 feet. Light winds. Chance of rain 50 percent.

Monday: Mostly sunny in the morning then becoming partly sunny. Scattered showers. Highs around 82 near the shore to around 68 above 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Monday Night: Partly cloudy. Scattered showers in the evening, then isolated showers after midnight. Haze through the night. Lows around 65 near the shore to around 54 above 3000 feet. East winds up to 10 mph. Chance of rain 40 percent.

South Kaua’i

Rest Of Tonight: Mostly cloudy. Isolated showers early in the evening, then numerous showers after midnight. Lows around 61. Light winds. Chance of rain 70 percent.

Monday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 75 to 81. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Monday Night: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Haze through the night. Lows around 64. East winds 10 to 15 mph shifting to the northeast after midnight. Chance of rain 40 percent.

Kaua’i Mountains

Rest Of Tonight: Mostly cloudy. Scattered showers early in the evening, then numerous showers after midnight. Lows around 59 in the valleys to around 50 above 4000 feet. Light winds becoming northwest up to 10 mph after midnight. Chance of rain 70 percent.

Monday: Mostly cloudy with numerous showers. Highs 69 to 78 in the valleys to around 61 above 4000 feet. East winds up to 15 mph. Chance of rain 70 percent.

Monday Night: Mostly cloudy with scattered showers. Haze. Lows 59 to 64 in the valleys to around 53 above 4000 feet. Southeast winds up to 10 mph. Chance of rain 50 percent.

North Kaua’i

Rest Of Tonight: Mostly cloudy with numerous showers. Lows 56 to 65. Light winds becoming west up to 15 mph after midnight. Chance of rain 70 percent.

Monday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 73 to 80. East winds up to 15 mph. Chance of rain 70 percent.

Monday Night: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Haze through the night. Lows 59 to 67. Southeast winds up to 10 mph. Chance of rain 40 percent.

East Kaua’i

Rest Of Tonight: Mostly cloudy. Scattered showers early in the evening, then numerous showers after midnight. Lows 57 to 66. Light winds becoming northwest up to 10 mph after midnight. Chance of rain 70 percent.

Monday: Cloudy with numerous showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 69 to 80. Northeast winds up to 15 mph shifting to the east in the afternoon. Chance of rain 70 percent.

Monday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Haze. Lows 60 to 69. East winds up to 10 mph. Chance of rain 50 percent.

Detailed Forecast

Update

Updated to include newly issued Small Craft Advisory.

Synopsis

A weak surface ridge will maintain light winds and rather dry conditions over much of the state tonight as an advancing front produces increased clouds and showers on Kauai. The front will bring a period of trade winds and showers to mainly windward Kauai and Oahu on Monday and may reach as far as Maui. The front will dissipate and lift northward Monday night as winds shift out of the southeast. A surface ridge will settle over the islands Tuesday and produce a somewhat dry land and sea breeze pattern through Thursday. Another weak front may affect portions of the state Thursday night into Saturday.

Aviation

A approaching weak front from the northwest will bring an increase of showers as it reaches Kauai tonight, Oahu by daybreak, and stall out near Maui County Monday. Light winds will prevail over most islands but the front will bring an increase of showers and breezy easterly trade winds on Monday. MVFR ceilings and visibility associated with the cold front will linger from Kauai through Monday County through Monday afternoon. Winds look to weaken and veer as light to moderate east to southeast winds will fill in by Monday night.
No AIRMETs are currently in effect, however AIRMET Sierra will likely go into effect later tonight into tomorrow due to the approaching front.

Marine

Fresh northerly winds associated with a front settling southward into the region will gradually spread across the Kauai waters late tonight, then expand into the waters north of Oahu by daybreak Monday. Locally stronger terrain-driven winds along the leeward and windward coasts of Kauai may briefly approach or reach Small Craft Advisory levels during this period. The latest guidance shows this boundary stalling and gradually weakening as it lingers from east to west across the smaller islands through Monday. High pressure building north of the area in its wake will allow northerly winds to veer easterly on Monday. For Maui County and the Big Island waters, light winds will prevail overnight, then gradually shift out of the east and increase into the light to moderate range through the day Monday.
The progressive pattern across the region continues thereafter, with another front approaching by midweek. As the ridge axis shifts southward over the islands, winds will veer to the south to southeast Monday night through Tuesday. This front could reach the Kauai waters late in the week.
Surf along exposed north- and west-facing shores will remain small through Monday as the medium-period northwest swell that arrived Sunday continues to ease. Combined with fresh northeast breezes, this will lead to rough and choppy conditions along northern exposures of Kauai, and potentially Oahu early Monday depending on how far south the boundary settles.
A fresh, medium-period northwest swell generated by a broad storm-force low tracking eastward near the Aleutians will arrive Monday night, then shift out of the north-northwest and peak Tuesday night. Surf may approach advisory levels before gradually easing Wednesday into Thursday.
Another larger northwest swell is expected later this week as a broad and complex low evolves over the far northwest Pacific. This swell will begin building down the island chain Thursday and could become a long-duration event, with a peak centered around the Friday through Saturday time frame. Some uncertainty remains regarding the magnitude and timing, as the ECMWF and GFS continue to depict differences in the evolution of this system.
Surf along east-facing shores will briefly trend upward as the trades return Monday, with the highest surf expected along Kauai and Oahu. This will be short-period and choppy, driven primarily by locally generated wind waves, and should be short-lived. A downward trend is anticipated by Tuesday as winds shift toward the south and upstream trade flow remains absent.
Surf along south-facing shores may also see a slight uptick by Tuesday as a small, background long-period south swell arrives. This source is expected to ease by midweek.
PREV DISCUSSION… ISSUED AT 320 PM HST JAN 25 2026 A surface ridge stretching across the island chain is producing rather dry conditions over all islands except Kauai. On the Garden Isle, convergent southerly winds ahead of an approaching front has been generating scattered showers through much of the day, but rainfall totals have been unimpressive at one tenth of an inch or less. Elsewhere, daytime sea breezes have produced some interior clouds, but little if any rainfall has been measured.
Expect continued dry conditions and light winds for most islands tonight as a front brings an increase in showers and a short-lived burst of fresh northeasterly winds to Kauai. The somewhat shallow front will spread to Oahu near daybreak and may bring a brief return of trade winds and increased showers to windward portions of Maui County before stalling on Monday. Showers will diminish Monday night as the front dissipates and slowly lifts northward on developing southeasterly winds. Due to the recent eruption at Kilauea, volcanic emissions (vog) will likely be noticeable from the Big Island to at least Oahu during this time.
Another period of somewhat dry conditions with light winds is in store Tuesday through Thursday, as a surface ridge redevelops over the islands. Winds will initially start as southerlies and will become variable by late Wednesday. Regardless, overnight land breezes and daytime sea breezes will likely overpower the background flow, leading to mostly dry conditions at night and afternoon clouds with a few showers each day.
Another weak front may move down parts of the island chain Thursday night into Saturday. Significant timing differences persist between the operational GFS and ECMWF runs, but at this time, neither model is suggesting a threat for heavy rainfall.

Prev discussion

/ISSUED 833 PM HST Sun Jan 25 2026/
SHORT TERM UPDATE… A cold front is approaching Kauai County this evening, bringing abundant clouds along with scattered showers and gusty northeast winds. These initially northeast winds will quickly become easterly Monday. This was handled well by the previous forecast and is described more fully below in the previous discussion. We have done a minor update this evening to increase cloud cover and chance of showers over the western end of the state through Monday morning. New forecast will be out shortly.
SYNOPSIS… A weak surface ridge will maintain light winds and rather dry conditions over much of the state tonight as an advancing front produces increased clouds and showers on Kauai. The front will bring a period of trade winds and showers to mainly windward Kauai and Oahu on Monday and may reach as far as Maui. The front will dissipate and lift northward Monday night as winds shift out of the southeast. A surface ridge will settle over the islands Tuesday and produce a somewhat dry land and sea breeze pattern through Thursday. Another weak front may affect portions of the state Thursday night into Saturday.
AVIATION… A approaching weak front from the northwest will bring an increase of showers as it reaches Kauai tonight, Oahu by daybreak, and stall out near Maui County Monday. Light winds will prevail over most islands but the front will bring an increase of showers and breezy easterly trade winds on Monday. MVFR ceilings and visibility associated with the cold front will linger from Kauai through Monday County through Monday afternoon. Winds look to weaken and veer as light to moderate east to southeast winds will fill in by Monday night.
No AIRMETs are currently in effect, however AIRMET Sierra will likely go into effect later tonight into tomorrow due to the approaching front.
MARINE… Fresh northerly winds associated with a front settling southward into the region will gradually spread across the Kauai waters late tonight, then expand into the waters north of Oahu by daybreak Monday. Locally stronger terrain-driven winds along the leeward and windward coasts of Kauai may briefly approach or reach Small Craft Advisory levels during this period. The latest guidance shows this boundary stalling and gradually weakening as it lingers from east to west across the smaller islands through Monday. High pressure building north of the area in its wake will allow northerly winds to veer easterly on Monday. For Maui County and the Big Island waters, light winds will prevail overnight, then gradually shift out of the east and increase into the light to moderate range through the day Monday.
The progressive pattern across the region continues thereafter, with another front approaching by midweek. As the ridge axis shifts southward over the islands, winds will veer to the south to southeast Monday night through Tuesday. This front could reach the Kauai waters late in the week.
Surf along exposed north- and west-facing shores will remain small through Monday as the medium-period northwest swell that arrived Sunday continues to ease. Combined with fresh northeast breezes, this will lead to rough and choppy conditions along northern exposures of Kauai, and potentially Oahu early Monday depending on how far south the boundary settles.
A fresh, medium-period northwest swell generated by a broad storm-force low tracking eastward near the Aleutians will arrive Monday night, then shift out of the north-northwest and peak Tuesday night. Surf may approach advisory levels before gradually easing Wednesday into Thursday.
Another larger northwest swell is expected later this week as a broad and complex low evolves over the far northwest Pacific. This swell will begin building down the island chain Thursday and could become a long-duration event, with a peak centered around the Friday through Saturday time frame. Some uncertainty remains regarding the magnitude and timing, as the ECMWF and GFS continue to depict differences in the evolution of this system.
Surf along east-facing shores will briefly trend upward as the trades return Monday, with the highest surf expected along Kauai and Oahu. This will be short-period and choppy, driven primarily by locally generated wind waves, and should be short-lived. A downward trend is anticipated by Tuesday as winds shift toward the south and upstream trade flow remains absent.
Surf along south-facing shores may also see a slight uptick by Tuesday as a small, background long-period south swell arrives. This source is expected to ease by midweek.
PREV DISCUSSION… ISSUED AT 320 PM HST JAN 25 2026 A surface ridge stretching across the island chain is producing rather dry conditions over all islands except Kauai. On the Garden Isle, convergent southerly winds ahead of an approaching front has been generating scattered showers through much of the day, but rainfall totals have been unimpressive at one tenth of an inch or less. Elsewhere, daytime sea breezes have produced some interior clouds, but little if any rainfall has been measured.
Expect continued dry conditions and light winds for most islands tonight as a front brings an increase in showers and a short-lived burst of fresh northeasterly winds to Kauai. The somewhat shallow front will spread to Oahu near daybreak and may bring a brief return of trade winds and increased showers to windward portions of Maui County before stalling on Monday. Showers will diminish Monday night as the front dissipates and slowly lifts northward on developing southeasterly winds. Due to the recent eruption at Kilauea, volcanic emissions (vog) will likely be noticeable from the Big Island to at least Oahu during this time.
Another period of somewhat dry conditions with light winds is in store Tuesday through Thursday, as a surface ridge redevelops over the islands. Winds will initially start as southerlies and will become variable by late Wednesday. Regardless, overnight land breezes and daytime sea breezes will likely overpower the background flow, leading to mostly dry conditions at night and afternoon clouds with a few showers each day.
Another weak front may move down parts of the island chain Thursday night into Saturday. Significant timing differences persist between the operational GFS and ECMWF runs, but at this time, neither model is suggesting a threat for heavy rainfall.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Monday for Kauai Northwest Waters, Kauai Windward Waters, Kauai Channel, Oahu Windward Waters.

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Data Courtesy of NOAA.gov