West Kaua’i

Rest Of Tonight: Partly cloudy with isolated showers. Lows 72 to 77 near the shore to around 64 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Friday: Mostly sunny with isolated showers in the morning, then mostly cloudy in the afternoon. Highs 86 to 93 near the shore to around 80 above 3000 feet. East winds up to 15 mph shifting to the west in the afternoon. Chance of rain 20 percent.

Friday Night: Mostly cloudy. Lows 71 to 76 near the shore to around 64 above 3000 feet. East winds up to 10 mph.

South Kaua’i

Rest Of Tonight: Partly cloudy early in the evening then becoming mostly cloudy. Scattered showers. Lows around 75. East winds 10 to 15 mph. Chance of rain 40 percent.

Friday: Partly sunny. Scattered showers in the morning. Highs 83 to 91. East winds 10 to 15 mph. Chance of rain 30 percent.

Friday Night: Mostly cloudy with isolated showers. Lows 72 to 77. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Kaua’i Mountains

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 67 to 72 in the valleys to around 62 above 4000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs 77 to 86 in the valleys to around 69 above 4000 feet. East winds up to 15 mph. Chance of rain 40 percent.

Friday Night: Breezy. Mostly cloudy with isolated showers. Lows 66 to 72 in the valleys to around 61 above 4000 feet. East winds up to 10 mph increasing to up to 20 mph after midnight. Chance of rain 20 percent.

North Kaua’i

Rest Of Tonight: Partly cloudy early in the evening then becoming mostly cloudy. Scattered showers. Lows 67 to 76. Southeast winds up to 10 mph. Chance of rain 50 percent.

Friday: Partly sunny. Scattered showers in the morning. Highs 79 to 89. East winds up to 15 mph. Chance of rain 40 percent.

Friday Night: Mostly cloudy with isolated showers. Lows 67 to 75. East winds up to 15 mph. Chance of rain 20 percent.

East Kaua’i

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 67 to 79. East winds 10 to 15 mph shifting to the northeast after midnight. Chance of rain 50 percent.

Friday: Mostly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 75 to 88. East winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 40 percent.

Friday Night: Mostly cloudy with isolated showers. Lows 66 to 78. East winds around 10 mph. Chance of rain 20 percent.

Detailed Forecast

Update

Issued to update marine hazards/advisories.
High Surf Advisory is in effect from 6 AM HST Friday until 6 AM HST Monday for all south facing shores.
Coastal Flood Statement is out for all shores to cover the minor coastal inundation threat during high tide.

Synopsis

Breezy trades will take the edge off humidity through Friday before winds weaken this weekend and higher humidity creeps back into the area early next week. Limited rainfall during this time.

Aviation

A typical trade wind pattern has returned with moderate to locally breezy conditions continuing the next 24 hours. Limited showers will bring periods of MVFR windward and mauka this evening. VFR prevails elsewhere.
AIRMET Sierra for tempo mountain obscuration is in effect.

Marine

The weak trough has lifted away from the state and moderate to locally strong trade winds have returned across the state. A Small Craft Advisory is in effect through Friday for locally strong trades across the windier waters surrounding Maui County and Big Island. High pressure far northeast of the state will drift to the north over the weekend as Tropical Storm Henriette approaches the region from the east. Henriette is expected to gain latitude over the next several days and pass just outside of the northeast and north offshore waters Saturday night through Sunday night. At this time it is too early to tell, but since it would be passing close to the edge of the offshore waters, a Tropical Storm Warning may be needed for our offshore waters.
A new long-period south swell continues to fill in this afternoon and is expected to peak on Friday. A much larger south swell should gradually build on Friday and peak on Saturday near High Surf Warning thresholds. With the onset of the large south swell expected to steadily build on Friday, a High Surf Advisory is in effect starting Friday morning and continuing through Sunday night. This swell should gradually fade Sunday into the first half of next week.
Moderate to locally strong trades will continue to produce rough and choppy surf the next few days along east facing shores. Some mid-period east swell is possible from Tropical Storm Henriette this weekend which could produce some moderate surf.
West Pacific typhoon activity over the past week will continue to produce small swells from the west-northwest to northwest through early next week.
Peak afternoon high tides, combined with elevated water levels running about a half a foot higher than predicted and a large south swell, will lead to minor flooding along many south-facing shorelines and low lying coastal areas through Sunday afternoon.

Prev discussion

/ISSUED 345 PM HST Thu Aug 7 2025/ Mid to upper-level ridging is noted on regional satellite imagery and model solutions over the Hawaiian Islands. This ridging will remain in place through the near term in maintenance of continued high stability. At the surface, visible imagery shows a meridionally- oriented band of clouds positioned in the vicinity of Oahu at press time. This band of clouds exists along the convergent lead edge of returning breezy trade winds. Returning trades will focus limited showers windward and mauka heading into the weekend but, more notably, will take the edge off humidity as dewpoints fall a few degrees into the upper 60s for Friday.
Nascent upper troughing is noted in the form of a a sheared ribbon of potential vorticity north of the islands, around 30N per water vapor imagery. Modeling indicates this will evolve into a deepening trough that will draw TS Henriette north of the islands Saturday through Monday. During this time, winds will once again diminish leading to warmer conditions. In addition, deepening troughing will cause low-level winds to veer to SE early next week which will advect 70s dewpoints back into the area and mark a return to pattern of light winds and high humidity similar to the last couple of days. Emerging land and sea breezes during this period of light winds may foster pockets of afternoon showers, though dry mid-levels should maintain some semblance of capping resulting in limited potential for meaningful rainfall.
AVIATION… A typical trade wind pattern has returned with moderate to locally breezy conditions continuing the next 24 hours. Limited showers will bring periods of MVFR windward and mauka this evening. VFR prevails elsewhere.
AIRMET Sierra for tempo mountain obscuration is in effect.
&&
MARINE… The weak trough has lifted away from the state and moderate to locally strong trade winds have returned across the state. A Small Craft Advisory is in effect through Friday for locally strong trades across the windier waters surrounding Maui County and Big Island. High pressure far northeast of the state will drift to the north over the weekend as Tropical Storm Henriette approaches the region from the east. Henriette is expected to gain latitude over the next several days and pass just outside of the northeast and north offshore waters Saturday night through Sunday night. At this time it is too early to tell, but since it would be passing close to the edge of the offshore waters, a Tropical Storm Warning may be needed for our offshore waters.
A new long-period south swell continues to fill in this afternoon and is expected to peak on Friday. A much larger south swell should gradually build on Friday and peak on Saturday near High Surf Warning thresholds. With the onset of the large south swell expected to steadily build on Friday, a High Surf Advisory is in effect starting Friday morning and continuing through Sunday night. This swell should gradually fade Sunday into the first half of next week.
Moderate to locally strong trades will continue to produce rough and choppy surf the next few days along east facing shores. Some mid-period east swell is possible from Tropical Storm Henriette this weekend which could produce some moderate surf.
West Pacific typhoon activity over the past week will continue to produce small swells from the west-northwest to northwest through early next week.
Peak afternoon high tides, combined with elevated water levels running about a half a foot higher than predicted and a large south swell, will lead to minor flooding along many south-facing shorelines and low lying coastal areas through Sunday afternoon.

Fire weather

Breezy trades return this evening through Friday yielding dewpoints falling toward seasonably average values in the upper 60s. Conditions are not forecast to approach critical fire weather thresholds during this time. Fire weather concerns are then minimal from Saturday onward as winds diminish and gradually rising dewpoints contribute to increased RH well into next week.

HFO Watches/Warnings/Advisories

High Surf Advisory from 6 AM Friday to 6 AM HST Monday for Niihau, Kauai Leeward, Waianae Coast, Kahoolawe, Maui Leeward West, Kona, Kohala, Kauai South, East Honolulu, Honolulu Metro, Ewa Plain, Molokai Southeast, Molokai Leeward South, Lanai Leeward, Lanai South, Maui Central Valley South, South Maui/Upcountry, South Haleakala, Big Island South, Big Island Southeast.
Small Craft Advisory until 6 PM HST Friday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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