West Kaua’i

Tonight: Mostly cloudy with scattered showers in the evening, then partly cloudy with isolated showers after midnight. Lows around 75 near the shore to around 65 above 3000 feet. East winds up to 10 mph. Chance of rain 40 percent.

Friday: Mostly sunny with isolated showers. Highs 85 to 91 near the shore to around 78 above 3000 feet. East winds up to 10 mph. Chance of rain 20 percent.

Friday Night: Partly cloudy with isolated showers. Lows around 74 near the shore to around 64 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 71 to 77. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 79 to 89. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 69 to 76. Northeast winds around 10 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers. Lows around 70 in the valleys to around 62 above 4000 feet. East winds around 10 mph. Chance of rain 50 percent.

Friday: Partly sunny. Showers likely in the morning, then scattered showers in the afternoon. Highs 75 to 83 in the valleys to around 74 above 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 66 to 71 in the valleys to around 61 above 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 67 to 76. East winds up to 15 mph becoming around 10 mph after midnight. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 72 to 88. East winds up to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows 65 to 75. East winds up to 10 mph. Chance of rain 40 percent.

East Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 67 to 77. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 78 to 86. East winds 10 to 15 mph. Chance of rain 50 percent.

Friday Night: Mostly cloudy with scattered showers. Lows 66 to 76. East winds around 10 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Drier easterly flow will filter in today into Friday, bringing a return of a typical trade wind pattern through early next week. Another influx of tropical moisture is possible towards the middle of next week as a disturbance potentially moves into the region.

Discussion

Afternoon satellite water vapor imagery shows the last of the tropical moisture lingering from Lowell has moved off to the southwest. Light showers continue along the windward side of the Big Island, with otherwise partly to mostly cloudy condittions across the state.
The synoptic pattern remains largely unchanged into early next week with a broad upper level low well to the northeast. Drier air will filter in on the back side of this low into Friday, allowing for dew points to lower back into the mid 60s in the lower elevations by Friday. Trade winds will slowly build in today and prevail into early next week. More typical afternoon and evening showers can be expected on the windward sides of the islands. Towards the middle of next week, the upper level low weakens and lifts northeast and high pressure begins to expand westward across the state. A weak disturbance could bring an increase in moisture by Thursday, though there's considerable spread in ensemble precipitable water due to differences in the track of the disturbance.

Aviation

Trade winds are growing gusty in places, and this combined with lingering moisture has allowed for ongoing showers this afternoon into this evening. Satellite shows a mix of clear skies to mostly cloudy skies, resulting in ceilings generally ranging from VFR to MVFR. The lower ceilings, and at times reduced visibility are possible at times due to the showers and clouds, however, expecting conditions to gradually improve with a drying trend into the evening and overnight.
AIRMET Sierra remains for the Big Island, Maui, Oahu and Kauai through at least 04Z. Light spotty afternoon to evening showers continue to be possible into this evening. However, drying trade winds will likely end the showers and reduce clouds significantly for tomorrow.

Marine

Moderate to locally fresh trade winds will return tonight as a weak trough orientated north to south shifts west of Kauai. A couple of troughs far northeast and southeast will keep a weak pressure gradient across the state through the weekend. The trough from the southeast will near the state Saturday allowing winds to shift out of the northeast through early next week.
A moderate mid-period south swell will continue to steadily decline over the next few days with below average surf expected by the weekend. Background southerly swells will keep surf from going flat over the weekend into early next week. A Gale low just east Australia will shift east of New Zealand over the next couple of days in a more favorable position for more consistent south swells for Hawaii late next week. Forerunners from the captured fetch from this system could start trickling in by mid week and gradually build through the rest of the week into next weekend, generating above average surf.
Near seasonal average surf generated by former tropical cyclones will gradually fade to below average by Saturday and hold into early next week as trades locally and upstream remain disrupted.
Tiny surf along north facing shores as Lowell will drop tonight as the small swell from Lowell continues to fade.

Fire weather

Issued at 356 PM HST Thu Sep 10 2026
Fire weather risk will remain low the next several days due light winds and lingering moisture. Expect a slight chance of thunderstorms over the Big Island this afternoon. Temperature inversion heights are expected to remain elevated or weak.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov