West Kaua’i

Today: Mostly sunny in the morning, then mostly cloudy with isolated showers in the afternoon. Highs around 85 near the shore to around 73 above 3000 feet. Light winds. Chance of rain 20 percent.

Tonight: Mostly cloudy with isolated showers. Lows around 73 near the shore to around 62 above 3000 feet. Light winds. Chance of rain 20 percent.

Wednesday: Partly sunny with isolated showers. Highs around 85 near the shore to around 73 above 3000 feet. North winds up to 10 mph shifting to the southeast in the afternoon. Chance of rain 20 percent.

South Kaua’i

Today: Partly sunny. Isolated showers in the morning. Highs around 82. Northeast winds 10 to 15 mph. Chance of rain 20 percent.

Tonight: Mostly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 69 to 74. North winds 10 to 15 mph. Chance of rain 40 percent.

Wednesday: Partly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 82. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Kaua’i Mountains

Today: Mostly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 72 to 79 in the valleys to around 63 above 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with numerous showers. Lows 62 to 67 in the valleys to around 56 above 4000 feet. Light winds. Chance of rain 70 percent.

Wednesday: Mostly cloudy. Numerous showers early in the morning, then scattered showers late in the morning. Isolated showers in the afternoon. Highs 72 to 79 in the valleys to around 63 above 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

North Kaua’i

Today: Partly sunny with isolated showers. Highs 75 to 85. East winds up to 15 mph. Chance of rain 20 percent.

Tonight: Mostly cloudy with scattered showers. Lows 65 to 72. Southeast winds up to 10 mph. Chance of rain 50 percent.

Wednesday: Mostly cloudy. Scattered showers early in the morning, then isolated showers in the late morning and afternoon. Highs 75 to 85. East winds up to 15 mph. Chance of rain 50 percent.

East Kaua’i

Today: Partly sunny with isolated showers. Highs 75 to 84. North winds up to 15 mph shifting to the northeast in the afternoon. Chance of rain 20 percent.

Tonight: Mostly cloudy with scattered showers. Lows 63 to 74. North winds up to 10 mph. Chance of rain 50 percent.

Wednesday: Mostly cloudy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 75 to 84. Northeast winds up to 15 mph shifting to the east in the afternoon. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Light to moderate trade winds will persist through Thursday, maintaining mostly dry and stable conditions across the islands. Showers will favor windward slopes and coasts overnight into the morning hours, then shift to leeward areas each afternoon where sea breezes develop. An upper-level disturbance near the western end of the state may lead to a slight increase in clouds and showers there, mainly through midweek, before lifting northeast and away from the islands. Breezy trade winds are expected to return Friday and continue into the weekend.

Discussion

Short-term model guidance remains in good agreement, showing light to moderate trade winds persisting into Thursday as a weak subtropical ridge holds north of the islands. A well-established mid-level ridge continues to promote dry and stable conditions, with the trade wind inversion anchored around 6,000 feet. These factors have limited overnight shower activity, with only isolated pockets of moisture producing light rainfall along windward slopes.
An upper-level low near Kauai is expected to become more organized later today, drawing a narrow band of moisture over the island from late today through Wednesday. This may lead to an increase in shower coverage across windward areas, with some afternoon showers forming over leeward sections. Elsewhere, shower activity should remain minimal – confined mainly to windward locations overnight and early mornings, and to interior and leeward areas where sea breezes develop during the afternoon.
Toward the end of the week, surface high pressure is forecast to reestablish itself well northeast of the islands. This will support stronger trade winds Friday and Saturday. At the same time, the upper low will gradually shift east of the area, allowing for more stable and slightly drier conditions to settle in. Trades may veer slightly east-southeast and ease a bit on Sunday as a surface trough develops west of the state, but overall, the weather should remain fair into early next week.

Aviation

VFR conditions are expected to prevail for most areas through midweek, with brief showers possible over windward locations overnight, and across some interior locations through the afternoons where sea breezes form. An upper-level disturbance near the western end of the state may lead to a slight increase in clouds and showers later today through early Wednesday – potentially leading to brief periods of MVFR conditions tonight.
There are currently no AIRMETs in effect and none are anticipated today.

Marine

The high pressure ridge far north of the Hawaiian Islands will weaken through Friday in response to cold fronts passing through the Central Pacific basin. Trade winds will remain in the gentle to moderate range through Friday, then increase to fresh levels this weekend as the ridge builds.
Surf heights will remain tiny for all shores through Wednesday. Surf heights will increase along north and west facing shores from Wednesday night through Thursday as a brief north-northwest (330-340 deg) swell pulses through the region. A larger north- northwest (330-340 deg) swell arrives in the islands by early Saturday morning producing moderate surf heights along north and west facing shores. This swell fades rapidly from Saturday night to Sunday.
A small background pulse in the south swell energy will produce a slight bump to surf heights along south facing shores starting Wednesday afternoon, peaking by Friday, and then slowly fading through the weekend.

HFO Watches/Warnings/Advisories

None.