West Kaua’i

Rest Of Tonight: Partly cloudy early in the evening then becoming mostly cloudy. Scattered showers. Lows around 70 near the shore to around 61 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Saturday: Partly sunny with scattered showers. Highs 80 to 85 near the shore to around 71 above 3000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Saturday Night: Partly cloudy with isolated showers. Lows around 69 near the shore to around 58 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

South Kaua’i

Rest Of Tonight: Mostly cloudy with scattered showers. Lows around 70. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Breezy. Partly sunny with scattered showers. Highs 75 to 84. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Saturday Night: Breezy. Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows around 69. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Kaua’i Mountains

Rest Of Tonight: Mostly cloudy with numerous showers. Lows 63 to 69 in the valleys to around 59 above 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Saturday: Mostly cloudy. Showers in the morning, then numerous showers in the afternoon. Highs 71 to 77 in the valleys to around 62 above 4000 feet. Northeast winds up to 15 mph. Chance of rain 90 percent.

Saturday Night: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 60 to 68 in the valleys to around 57 above 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph after midnight. Chance of rain 50 percent.

North Kaua’i

Rest Of Tonight: Mostly cloudy. Scattered showers early in the evening, then numerous showers after midnight. Lows 65 to 72. East winds 10 to 15 mph decreasing to up to 10 mph after midnight. Chance of rain 60 percent.

Saturday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 72 to 81. East winds up to 15 mph shifting to the northeast in the afternoon. Chance of rain 70 percent.

Saturday Night: Partly cloudy with scattered showers. Lows 62 to 70. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

East Kaua’i

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 64 to 72. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 71 to 81. Northeast winds 10 to 15 mph. Chance of rain 70 percent.

Saturday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 62 to 73. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

A weak surface trough will gradually move east to west across the islands tonight through Saturday, resulting in relatively light winds and a combination of trade showers and sea-breeze showers (during the afternoons). As this trough dissipates, trades will build in stronger Saturday night through Sunday, and even stronger trades are forecast for next week from Tuesday onward.

Short term update

Minor updates were made to PoP otherwise previous forecast remains on track.

Prev discussion

Issued at 339 PM HST Fri May 8 2026
Radar show showers, mainly windward and mauka, over Kauai and Niihau this afternoon. An increase in showers across the Big Island is expected soon, and is likely also on windward (northeast) Maui and Molokai. Satellite indicates low clouds over or near the higher terrain on each island, along with wispy high clouds streaming in from the southwest. These higher clouds should continue through the night, while the lower clouds will diminish in most areas after sunset.
A weak surface trough was located between Maui County and the Big Island as of 3 PM HST this afternoon. This feature will slowly drift westward, reaching Kauai Sunday. Trade winds will build in behind this trough, moving in from east to west through this weekend. Wind speeds will initially be light to moderate, but will become moderate to occasionally breezy early next week. This trough will keep winds weak enough to allow for sea-breeze showers to occasionally develop over leeward areas, even as trade winds build in and bring their typical windward-focused showers.
While that is occurring at the surface, the flow aloft will change significantly. We will transition from weak troughing to our north this weekend to the rapid development of a closed ridge to our northwest by Monday. This ridge will become elongated along an east-west axis and remain with us all next week. Its presence will keep a surface ridge in place, allowing the trades to blow at least through the end of next week, and likely longer. This means trade wind showers, mainly windward and mauka, will be the rule for quite a while. There will be occasional fluctuations in available moisture throughout this period, and these will result in periods of enhanced shower activity from time to time. The timing is impossible to nail down more than a few days in advance.

Aviation

Light to moderate trades gradually return tonight, becoming locally breezy tomorrow morning and persisting through the next several days. Expect cloud and shower activity to develop along the typical windward and mauka areas, resulting in periods of MVFR conditions. Otherwise, VFR conditions will prevail.
AIRMET Sierra remains in effect for mountain obscuration over Kauai due to lingering showers. There will be consideration for AIRMET Tango for low-level turbulence as trades gradually return.

Marine

A high pressure ridge will remain in place north of the islands with gentle to fresh trade winds for most coastal waters with periods of strong trade winds developing over the windier waters and channels near Maui and the Big Island from Sunday onward. A Small Craft Advisory may be needed for these windier waters by Saturday night.
A declining moderate, medium-period, northwest swell will continue to bring elevated surf to north and west facing shores tonight. This swell and associated surf will slowly fade through the weekend. A new small, medium period northwest swell arrives on Saturday, leading to a small bump in north and west shore surf on Sunday. For the first half of next week, surf will be small with the lack of any significant northerly swell energy.
Background long period swell energy will keep small surf along south facing shores.
Surf along east facing shores will remain below normal this weekend, but will gradually increase through next week as trade winds gradually strengthen.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov