West Kaua’i

Rest Of Tonight: Partly cloudy with isolated showers. Lows around 71 near the shore to around 61 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Monday: Sunny with isolated showers. Highs 81 to 88 near the shore to around 74 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Monday Night: Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows around 69 near the shore to around 57 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

South Kaua’i

Rest Of Tonight: Breezy. Partly cloudy with isolated showers. Lows around 71. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

Monday: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 76 to 86. Northeast winds 10 to 20 mph. Chance of rain 40 percent.

Monday Night: Breezy. Mostly cloudy with scattered showers. Lows around 68. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Kaua’i Mountains

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 64 to 70 in the valleys to around 60 above 4000 feet. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered showers. Highs 73 to 79 in the valleys to around 65 above 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows 61 to 68 in the valleys to around 57 above 4000 feet. Northeast winds 10 to 20 mph. Chance of rain 70 percent.

North Kaua’i

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 65 to 72. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 74 to 82. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 62 to 71. Northeast winds 10 to 15 mph shifting to the east after midnight. Chance of rain 50 percent.

East Kaua’i

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 65 to 73. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered showers. Highs 73 to 82. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 62 to 72. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

A weak surface trough that brought areas of showers to much of the state the past few days has finally moved west of Kauai. Trade winds will now become fully established and continue through the upcoming week. We will see showers favoring windward and mauka areas, most frequently at night and during the early morning hours. Overall, the next week will be drier for most folks than this past week.

Short term update

Minor adjustments were made to PoP. Previous forecast is on track.

Prev discussion

Issued at 312 PM HST Sun May 10 2026
A surface trough which brought areas of showers, some briefly moderate to heavy, has moved just west of Kauai this afternoon. The state will see drier conditions for the remainder of this afternoon, and for most of the coming week. Radar this afternoon shows just a few showers in the Kona region on Big Island, with isolated windward showers elsewhere. In addition to lower clouds associated with showers, satellite showed thin high clouds continuing to stream over the region from the west-southwest.
At upper levels, a ridge north of the islands, spread across much of the Pacific south of 35 deg N, will dominate our weather for the upcoming week. A minor weakness in the ridge may develop late in the week, but guidance is in agreement that it won't be enough to weaken the associated surface ridge significantly. Therefore, trades will continue for the foreseeable future. We will experience a typical trade wind pattern, with showers mainly windward and mauka, and most frequent at night. Wind speeds are forecast to be moderate to breezy, strong enough to be concerning for boaters, but probably not strong enough for wind advisories on land.

Aviation

Stable and mostly dry trade wind weather is expected through Monday, with trades increasing a bit more to breezy levels by Monday afternoon. Isolated to scattered showers will continue to ride in with the trade winds, especially over Kauai and windward areas. Showers will be most prevalent in these locations during the overnight through morning periods, which could produce brief MVFR conditions. Otherwise VFR conditions should prevail at area terminals.
AIRMET Sierra remains in effect for north through east sections of Kauai this evening due to some lingering moisture in the area.
AIRMET Tango is also in effect for low-level turbulence downwind of island terrain. This AIRMET will likely be needed through the next several days. In addition, AIRMET Tango has been issued this evening for moderate upper level turbulence over the islands as well. Model guidance indicates that upper level turbulence is expected to largely diminish by Monday morning as the upper jet over the islands weakens and moves farther east.

Marine

Issued at 312 PM HST Sun May 10 2026
High pressure remains in place north of the Hawaiian Islands this week in maintenance of fresh to locally strong trades continuing into next weekend. The Small Craft Advisory remains in effect.
A small medium period NW swell maintains small surf along N and W shores today. A new slightly larger N swell arrives late tonight peaking during Monday. Another small long period NW swell arrives Wednesday afternoon and peaks early Thursday.
Small long period S swell has faded through today. However, two additional small long period S swells arrive Monday and Thursday. Surf along E shores remains below normal in the near term, with increasing surf peaking by Wednesday as trade winds strengthen.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 AM HST Tuesday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Maalaea Bay, Pailolo Channel.

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Data Courtesy of NOAA.gov