West Kaua’i

Tonight: Breezy. Partly cloudy with isolated showers. Lows around 65 near the shore to around 55 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Tuesday: Breezy. Mostly sunny with isolated showers. Highs around 80 near the shore to around 67 above 3000 feet. Northeast winds up to 20 mph. Chance of rain 20 percent.

Tuesday Night: Mostly clear. Isolated showers after midnight. Lows around 65 near the shore to around 55 above 3000 feet. Northeast winds 10 to 15 mph decreasing to up to 10 mph after midnight. Chance of rain 20 percent.

South Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 66. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Tuesday: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 73 to 80. Northeast winds 15 to 25 mph. Chance of rain 50 percent.

Tuesday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows around 64. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Breezy. Mostly cloudy with numerous showers. Lows 58 to 63 in the valleys to around 53 above 4000 feet. Northeast winds 10 to 25 mph decreasing to up to 20 mph after midnight. Chance of rain 70 percent.

Tuesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 67 to 74 in the valleys to around 57 above 4000 feet. Northeast winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 70 percent.

Tuesday Night: Mostly cloudy with scattered showers. Lows 57 to 63 in the valleys to around 52 above 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

North Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 58 to 68. East winds 10 to 20 mph. Chance of rain 50 percent.

Tuesday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 69 to 79. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Tuesday Night: Partly cloudy with scattered showers. Lows 58 to 67. East winds 10 to 15 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 59 to 69. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Tuesday: Breezy. Partly sunny with scattered showers. Highs 66 to 78. Northeast winds 10 to 20 mph. Chance of rain 50 percent.

Tuesday Night: Mostly cloudy with scattered showers. Lows 59 to 69. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Moderate to locally breezy trades will prevail through Tuesday, decreasing slightly by midweek, before easing to a more light and variable pattern by this weekend. Shower activity will be kept to a minimum as a cooler and drier airmass succumbs the Hawaiian Islands. A cold, upper-level trough makes an appearance late in the week and may slightly enhance trade wind showers, but any meaningful rainfall remains unlikely throughout the week.

Short term update

Issued at 807 PM HST Mon Mar 30 2026
The current forecast remains on track so no amendments were necessary. Moderate to locally breezy trades will prevail across the Hawaiian Islands through tomorrow and are still expected to ease slightly by midweek. Shower activity will be focused to windward and mauka locations, though moisture will remain limited due to the dry airmass aloft.

Prev discussion

An upper trough persists across the area as well producing thick cirrus clouds over the eastern end of the state. A 1032 mb surface high is centered far north of Hawaii driving fresh to strong trade winds across the area. Trades will focus low clouds and showers across windward areas, but accumulations will be light. 00Z sounding show precipitable water values of 0.78 inches at Lihue and 1.26 inches at Hilo (influenced by the high clouds), so showers will be limited by the relatively dry airmass.
Some guidance hints at a slight uptick in thunderstorm potential of around 10 percent over the Big Island, particularly along the southern slopes starting Tuesday afternoon. However, with moisture levels running exceptionally low, any storms that do form would likely be “dry” thunderstorms, producing lightning with little to no rainfall.
Looking ahead, the aforementioned high pressure system will gradually drift northeast and weaken around midweek. This will allow trades to ease, becoming lighter and more variable by Friday and into the weekend. At the same time, a weak upper-level trough may pass through late in the week. Even so, moisture remains limited, and any meaningful increase in rainfall still appears unlikely at this time. As always, we'll continue to monitor and refine the forecast as the pattern evolves.

Aviation

Issued at 807 PM HST Mon Mar 30 2026
Moderate to locally breezy trades through tomorrow. Low cigs and SHRA possible along windward and mauka locations. MVFR conds in heavier SHRA expected, but VFR prevails.
AIRMET Tango is in effect blw 080 for mod turb downwind of terrain.

Marine

Issued at 807 PM HST Mon Mar 30 2026
Fresh to strong NNE trades persist through Tuesday, driven by strong high pressure N of the islands. Winds ease during the second half of the week as a trough develops E of the state and high pressure shifts east. Another trough will develop N of the state towards the end of the week which will further weaken trades. The Small Craft Advisory has been extended through tomorrow due to winds.
A moderate short period NNE (020 degree) swell generated by a gale low NE of the state will hold through tonight. Spectral analysis indicates energy with this swell is spread throughout the spectrum, but the vast majority is contained within the shorter period bins. Observations indicate surf is underachieving as longer period energy insufficient to generate High Surf Advisory (HSA) level surf. The HSA has therefore been dropped. However, the MWS for harbor surges remains in effect through Tuesday given little change in surf conditions anticipated during the next 24 hours.
For other shorelines, surf along east facing shores will remain choppy and short-period due to the strong trade winds, with some areas also being exposed to the incoming NNE swell. South shores will continue to see small pulses from the southern hemisphere over the next few days. A storm-force low developing southeast of New Zealand over the next few days could send a moderate south- southwest swell the following week.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Tuesday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Big Island Windward Waters, Kaiwi Channel, Kauai Channel, Kauai Leeward Waters, Kauai Northwest Waters, Kauai Windward Waters, Maalaea Bay, Maui County Leeward Waters, Maui County Windward Waters, Oahu Leeward Waters, Oahu Windward Waters, Pailolo Channel.

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Data Courtesy of NOAA.gov