West Kaua’i
Tonight: Partly cloudy with isolated showers. Lows around 66 near the shore to around 56 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Thursday: Mostly sunny with isolated showers. Highs around 81 near the shore to around 68 above 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.
Thursday Night: Partly cloudy with isolated showers. Lows around 65 near the shore to around 56 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 20 percent.
South Kaua’i
Tonight: Mostly cloudy in the evening then becoming partly cloudy. Breezy. Scattered showers. Lows around 66. Northeast winds 10 to 20 mph. Chance of rain 30 percent.
Thursday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 75 to 82. Northeast winds 10 to 15 mph. Chance of rain 30 percent.
Thursday Night: Partly cloudy with isolated showers. Lows around 66. Northeast winds 10 to 15 mph. Chance of rain 20 percent.
Kaua’i Mountains
Tonight: Mostly cloudy with scattered showers. Lows 58 to 64 in the valleys to around 53 above 4000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.
Thursday: Partly sunny with scattered showers. Highs 69 to 75 in the valleys to around 59 above 4000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.
Thursday Night: Mostly cloudy with scattered showers. Lows 58 to 65 in the valleys to around 53 above 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 40 percent.
North Kaua’i
Tonight: Mostly cloudy with scattered showers. Lows 59 to 68. East winds up to 15 mph. Chance of rain 40 percent.
Thursday: Partly sunny in the morning then becoming mostly sunny. Scattered showers. Highs 71 to 80. East winds up to 15 mph. Chance of rain 40 percent.
Thursday Night: Partly cloudy with scattered showers. Lows 59 to 67. East winds 10 to 15 mph. Chance of rain 30 percent.
East Kaua’i
Tonight: Mostly cloudy with scattered showers. Lows 60 to 70. Northeast winds 10 to 15 mph. Chance of rain 40 percent.
Thursday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 68 to 79. Northeast winds 10 to 15 mph. Chance of rain 40 percent.
Thursday Night: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 60 to 70. Northeast winds 10 to 15 mph. Chance of rain 30 percent.
Detailed Forecast
Synopsis
Partly cloudy skies with lower humidity under breezy trades will continue the next several days. Limited shower activity will be confined to primarily windward zones and mauka slopes. Long range model guidance are coming more in line with the evolution of a deepening trough northwest of the state mid next week. This trough will pull up a more mositure-rich southern air mass and likely be the impetus to higher statewide precipitation.
Short term update
Issued at 752 PM HST Wed Apr 1 2026
IR satellite loop this evening shows scattered low level cumulus pushing in from the northeast, caught in the trade flow, and banking up against windward and mauka portions of the islands. Isolated light showers picked up on RADAR have only amounted to a few hundredths of an inch, as reported by a handful of stations, but nothing particularly noteworthy. Forecast remains largely on track in the short term. However, to account for the latest satellite and RADAR trends, the probability of precipitation for tonight has been decreased slightly for windward portions of the Big Island and Maui County and increased for windward portions of Oahu and Kauai where most moisture and low level cloud cover appears to be favoring.
Prev discussion
Issued at 359 PM HST Wed Apr 1 2026
Another pleasant day here in the islands with mostly sunny skies along many coastal areas and surrounding nearshore waters as cumulus build up along warmed mauka slopes. Morning ASCAT passes clipped the western half of the state and have verified that trades over these western waters are fading a touch. Moderate to fresh winds across such trade exposed areas as Kaena Point in northwest Oahu, Kalaupapa on Molokai and Big Island's North Kohala district are a clue that winds have stayed up through the island channels, especially around Maui County and Big Island. Afternoon near coastal observations and high resolution modeling are maintaining these amped up channel winds through Thursday, strongest over Ma'alaea Bay and the Pailolo and Alenuihaha Channels where winds should remain at Small Craft Advisory criteria. Overall trades will fade a bit Friday and this weekend as the pressure gradient relaxes in response to weak surface high moving onto the U.S. mainland's west coast.
Upper ridging nosing in from the west will guarantee a few more of these pleasant days for the majority of the Aloha State. Partially cloudy skies and continued dry conditions, with upper 50 to middle 60 F dew points, will be the rule. Afternoons will warm into the average middle to upper 70s along and near the coast, into the 60s above 2-3 kft. Tonight's full moon will clearly be seen in frequent lunar peeks between the passing low level clouds. Evening breezy coastal trades over windward areas while land breezes take hold within wind-sheltered interiors allowing temperatures to cool back into the middle 60s to low 70s. Local soundings depict a moistened lower 6-7 kft boundary layer capped by bone dry mid to upper layer air. This resident stable, dry air mass will guarantee any short-lived precipitation will be very light. Quick passing light showers will primarily focus along eastern-facing upslope mauka and within higher elevations with the occasional offshore shower passing across windward coastal areas.
The next significant weather producer for Hawaii will be in the form of a deepening trough west northwest of the islands early next week. Ridging passing north of the state this weekend will leave a wake for which a trough will begin to take shape next Monday. There will be a couple of shortwave disturbances that will travel into this trough, further deepening it as its axis nears the northwest offshore waters by late Wednesday into Thursday. The development of this trough will veer our regional winds more south of east. Higher humidity over more southern latitudes will be drawn northward and over the state through mid to late week. There should be just enough instability and lift provided by a negatively-tilted vicinity trough, along with split jet diffulence, within an near maxed out precipitable water air mass (for early April) to initiate statewide rainfall Wednesday and Thursday. At this time a week out, the main hazard is forecast to be locally heavy rain that, if it occurs, could result in flooding. In placing this next weather event in perspective is the GFS ensemble 'worse case scenario' (90th percentile probability) of Wednesday through Friday's average storm total QPF (Quantity of Precipitation Forecast) is between 2 to 4 inches. The big question mark going into next week will be on the timing and intensity of this mid to late week rain.
Aviation
Issued at 752 PM HST Wed Apr 1 2026
Moderate to locally breezy ENE trades persist through the period, anticipated to gradually weaken through the remainder of the week. Embedded isolated trade showers continue, predominately across windward and mauka areas, which may lower ceilings and visibility to MVFR at times. Otherwise, VFR conditions will prevail.
No AIRMETs are currently in effect.
Marine
Issued at 752 PM HST Wed Apr 1 2026
Weakening high pressure north of the islands will shift eastward over the next few days, leading to a weakening of the trade winds into the moderate range. Winds could then veer out of the southeast next week ahead of an approaching front. A Small Craft Advisory is in effect for the typically windier waters around Maui County and the Big Island through Thursday night.
The current mid period northeast swell (7 ft, 9-11 seconds at 040 degrees) will gradually decrease tomorrow as the northeast trade winds slowly decrease. As a result, east shore surf will gradually decline tomorrow through the rest of the week, but will still retain a little size and chop due to the moderate to locally breezy trades.
The next small, medium-period northwest (310 degree) swell will arrive this weekend into next week and bring a small bump in surf for north and west facing shores. Along south facing shores, expect small reinforcements to sustain small surf through the week until a slightly larger long period south swell fills in early next week.
HFO Watches/Warnings/Advisories
Small Craft Advisory until 6 AM HST Friday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Maalaea Bay, Pailolo Channel.
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Data Courtesy of NOAA.gov
