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Weather RadarRegional forecast
Regional Kaua`i Weather Forecast April 15, 2026
West Kaua’i
Tonight: Cloudy. Showers likely in the evening, then chance of showers after midnight. Lows around 69 near the shore to around 61 above 3000 feet. Light winds. Chance of rain 70 percent.
Wednesday: Mostly cloudy. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 80 to 85 near the shore to around 73 above 3000 feet. Light winds. Chance of rain 50 percent.
Wednesday Night: Mostly cloudy with a 20 percent chance of showers. Lows around 70 near the shore to around 60 above 3000 feet. Light winds.
South Kaua’i
Tonight: Cloudy. Showers likely in the evening, then chance of showers after midnight. Lows around 69. Light winds becoming northeast up to 10 mph after midnight. Chance of rain 70 percent.
Wednesday: Mostly cloudy with a 40 percent chance of showers. Highs 79 to 85. Northeast winds up to 10 mph.
Wednesday Night: Mostly cloudy with a 20 percent chance of showers. Lows around 70. Light winds.
Kaua’i Mountains
Tonight: Cloudy. Showers likely in the evening, then chance of showers after midnight. Lows 63 to 69 in the valleys to around 59 above 4000 feet. Light winds. Chance of rain 70 percent.
Wednesday: Mostly cloudy. Chance of showers in the morning, then showers likely in the afternoon. Highs 73 to 79 in the valleys to around 66 above 4000 feet. Light winds. Chance of rain 70 percent.
Wednesday Night: Mostly cloudy with a 20 percent chance of showers. Lows 62 to 69 in the valleys to around 59 above 4000 feet. Light winds.
North Kaua’i
Tonight: Cloudy. Showers likely in the evening, then chance of showers after midnight. Lows 63 to 71. Light winds. Chance of rain 70 percent.
Wednesday: Mostly cloudy. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 74 to 82. East winds up to 10 mph. Chance of rain 50 percent.
Wednesday Night: Mostly cloudy with a 20 percent chance of showers. Lows 63 to 71. Light winds.
East Kaua’i
Tonight: Cloudy. Showers likely in the evening, then chance of showers after midnight. Lows 64 to 73. Light winds. Chance of rain 70 percent.
Wednesday: Mostly cloudy with a 50 percent chance of showers. Highs 73 to 83. Light winds.
Wednesday Night: Mostly cloudy with a 20 percent chance of showers. Lows 64 to 73. Light winds.
Detailed Forecast
Synopsis
A low pressure system lingers far north of the Hawaiian Islands producing light and variable winds with chances for showers through Thursday. A passing high pressure system will bring a short return to easterly trade winds with subtle drying trends from Thursday night into Saturday. A series of low pressure systems passing just north of the state will produce light southeasterly winds from Sunday into the middle of next week.
Short term update
The large scale weather pattern remains unusual for this time of year due to the absence of a high pressure ridge that normally sets up just north of the Hawaiian Islands producing persistent and stable easterly trade winds. Large scale wind speeds will remain light, allowing local scale onshore sea breezes to develop daily over all islands. In the short range forecast cloudy skies and chances for light to moderate rain will continue.
Several slow moving low pressure systems passing north of the island chain will keep trade winds away for most of the seven day forecast time period lasting into next week. A brief return of easterly trade winds from Thursday night into Saturday will be fleeting. A series of low pressure systems passing just north of the state will produce light southeasterly winds from Sunday into the middle of next week.
The current forecast grids look reasonable for this weather pattern, no evening updates.
Previous discussion
Issued at 350 PM HST Tue Apr 14 2026
This afternoon's radar and satellite imagery shows an increase of moderate to locally heavy showers over parts of windward Kauai and central Oahu as a result of the day time sea breeze convergence and lingering moisture over the western half of the state. For tonight, we should generally see showers decrease across the state with land breezes developing over many areas.
For Wednesday and Thursday, trade winds will gradually fill in from east to west across the state with moderate trades expected by Thursday. Although the weather will be cloudy at times due to the upper level trough to our west, lower levels of the atmosphere will be fairly dry with mainly some isolated to scattered showers expected. The one exception is over Kauai, where we could see afternoon showers develop Wednesday afternoon over interior areas. Drier conditions are expected by Thursday for Kauai.
For Friday into the weekend, we will see an upper level trough digging down into the vicinity of the state from the northwest. The latest 12Z guidance continues to show the main moisture staying off to the west of the state with a surface low developing this weekend and lifting off to the north on both the GFS and ECMWF models. A subtle shift with the trough further east could change the weekend forecast quite a bit, so at this time the forecast for the weekend still remains uncertain. At the very least, we will likely see an increase of showers due to some low level moisture moving in from the east. Moderate easterly trades on Friday will likely gradually weaken and veer towards the southeast over the weekend especially around Sunday
Aviation
Issued at 350 PM HST Tue Apr 14 2026
Mostly VFR, but isolated IFR in low clouds persists, especially at PHNY. This should end this evening. There is a chance of showers at PHLI through early evening, with brief MVFR possible, but not expected. Winds will increase slightly overnight and become generally southeast Wednesday. ENE trades should return Thursday.
No AIRMETs in effect.
Marine
Weak troughing remains in place west of the state and will help to maintain gentle to locally moderate southeast flow through Thursday. Building high pressure then supports locally fresh trades across the waters Friday into the weekend.
A small, short-period, NW swell will continue to diminish into the weekend. A small, medium- period, S swell will boost surf along S shores through Friday, then subside over the weekend. Surf along E shores remains below the seasonal average as trades remain light. Increasing trades by week's end then brings a slight bump to surf.
HFO Watches/Warnings/Advisories
None.
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Data Courtesy of NOAA.gov
