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Weather RadarRegional forecast
Regional Kaua`i Weather Forecast April 16, 2026
West Kaua’i
Today: Partly sunny. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 80 to 86 near the shore to around 73 above 3000 feet. West winds up to 10 mph. Chance of rain 50 percent.
Tonight: Mostly cloudy in the evening then becoming partly cloudy. Lows around 69 near the shore to around 60 above 3000 feet. Light winds.
Friday: Cloudy. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs around 84 near the shore to around 73 above 3000 feet. Light winds becoming south up to 10 mph in the afternoon. Chance of rain 40 percent.
South Kaua’i
Today: Partly sunny. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 80 to 86. Northeast winds up to 10 mph. Chance of rain 40 percent.
Tonight: Mostly cloudy with a 20 percent chance of showers. Lows around 70. Northeast winds 10 to 15 mph.
Friday: Cloudy. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 79 to 85. Northeast winds 10 to 15 mph. Chance of rain 40 percent.
Kaua’i Mountains
Today: Mostly cloudy with a 50 percent chance of showers. Highs 75 to 81 in the valleys to around 67 above 4000 feet. East winds up to 10 mph.
Tonight: Mostly cloudy. Chance of showers in the evening, then slight chance of showers after midnight. Lows 62 to 69 in the valleys to around 59 above 4000 feet. Light winds becoming east up to 10 mph after midnight. Chance of rain 40 percent.
Friday: Cloudy with a 50 percent chance of showers. Highs 75 to 80 in the valleys to around 66 above 4000 feet. East winds up to 10 mph.
North Kaua’i
Today: Partly sunny. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 75 to 82. East winds up to 15 mph. Chance of rain 50 percent.
Tonight: Mostly cloudy. A 20 percent chance of showers in the evening. Lows 64 to 71. Southeast winds up to 10 mph.
Friday: Cloudy. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 76 to 84. East winds up to 15 mph. Chance of rain 40 percent.
East Kaua’i
Today: Partly sunny. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 74 to 83. East winds up to 10 mph. Chance of rain 50 percent.
Tonight: Mostly cloudy with a 20 percent chance of showers. Lows 64 to 73. Northeast winds up to 10 mph.
Friday: Cloudy with a 50 percent chance of showers. Highs 74 to 83. East winds up to 10 mph.
Detailed Forecast
Synopsis
A low pressure system lingers far to the north of Hawaii this morning, supporting continued light and variable winds with chances for light to moderate showers today. A passing high pressure system will bring a brief return to easterly trade winds with subtle drying trends from tonight into Saturday. A series of low pressure systems passing just north of the state will produce light to moderate southeasterly winds from Sunday into the middle of next week along with enhanced shower trends over the western islands on Monday and Tuesday.
Discussion
Looking into the water vapor satellite imagery this morning we continue to see a divergent Sub Tropical Jet stream over the Hawaiian Islands producing extensive high level cirrus and middle level alto-cumulus clouds. These cloudy skies will linger into early next week with enough instability in the atmosphere to support brief chances for passing showers each day.
A high pressure system will pass by just north of the state later tonight into Saturday, briefly building in easterly trade winds across the region. Wind speeds will become strong enough to limit sea breezes to terrain sheltered leeward western slopes of each island. Subtle drying trends will develop during this time period due to a slight increase in subsidence, downward vertical motions creating warming and drying effects, making the atmosphere a bit more stable.
However, the return to easterly trade winds will be fleeting and vanish quickly by Sunday as a series of low pressure systems develop and break down the ridge north of the state. These passing lows appear to track far enough north to limit any heavy rainfall or flooding issues for the islands. A passing upper level trough may increase cloud and shower trends over the western islands of Niihau, Kauai, Oahu and Molokai from Monday through Tuesday. A weak ridge will settle in over the eastern islands producing a fairly stable southeasterly wind pattern across the region. Any additional enhanced showers in this wind driven pattern will favor southeast slopes of Maui and the Big Island with modest additional rainfall amounts. Elsewhere rainfall will be limited as the passing cloud bands will move more parallel to island mountains and the Big Island will produce a leeside rain shadow across much of the islands in Maui County.
The long range forecast guidance shows another round of returning easterly trade winds from next week Thursday into the following weekend. A building upper level ridge will keep shower activity to a minimum, with brief passing showers favoring the typical windward and mountain areas in the overnight to early morning hours.
Aviation
Southeasterly winds should back more easterly today. Can expect some windward and mauka SHRA. While MVFR conds can be expected in SHRA, VFR should prevail.
No AIRMETs in effect.
Marine
A trough lingering to our northwest will maintain gentle to moderate easterly trade winds through today. The strongest breezes will occur through the typical windy channels surrounding Maui and the Big Island. Building high pressure will support moderate to locally fresh easterly trades across the waters Friday into Saturday. Winds may briefly reach Small Craft Advisory thresholds on Saturday. A low pressure system developing to our NW on Sunday will cause the trades to weaken slightly and veer towards the ESE. Gentle to moderate ESE winds are expected Sunday into early next week.
A small, short-period, NNW swell will continue to fade out today. Small background energy from the west will be possible this weekend into early next week from Typhoon Sinlaku, but confidence remains low. A much larger northwest to west-northwest swell is possible towards the end of next week as Typhoon Sinlaku makes an extratropical transition early next week.
A small to moderate, medium-period, SSE swell will boost surf along S shores through Friday then lower over the weekend. Surf along E shores remains below the seasonal average as trades remain light. However, increasing trades by week's end should brings a slight bump to surf. Low pressure advancing S along the W coast of the US next week sends a small, medium period NE swell toward the islands by midweek.
HFO Watches/Warnings/Advisories
None.
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Data Courtesy of NOAA.gov
