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Weather RadarRegional forecast
Regional Kaua`i Weather Forecast May 20, 2026
West Kaua’i
Tonight: Mostly clear. Isolated showers after midnight. Lows around 72 near the shore to around 63 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Wednesday: Breezy. Mostly sunny with isolated showers. Highs 83 to 89 near the shore to around 75 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.
Wednesday Night: Mostly clear. Breezy. Lows around 71 near the shore to around 62 above 3000 feet. East winds 10 to 20 mph decreasing to up to 20 mph after midnight.
South Kaua’i
Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows around 72. Northeast winds 10 to 15 mph. Chance of rain 40 percent.
Wednesday: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 77 to 87. Northeast winds 10 to 20 mph. Chance of rain 50 percent.
Wednesday Night: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 72. Northeast winds 15 to 20 mph. Chance of rain 40 percent.
Kaua’i Mountains
Tonight: Mostly cloudy with scattered showers. Lows around 68 in the valleys to around 61 above 4000 feet. East winds up to 15 mph. Chance of rain 50 percent.
Wednesday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 74 to 80 in the valleys to around 66 above 4000 feet. East winds up to 15 mph increasing to 10 to 25 mph in the afternoon. Chance of rain 70 percent.
Wednesday Night: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Scattered showers. Lows 64 to 69 in the valleys to around 60 above 4000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.
North Kaua’i
Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows 64 to 74. East winds up to 15 mph. Chance of rain 40 percent.
Wednesday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 69 to 84. East winds up to 15 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 50 percent.
Wednesday Night: Breezy. Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 63 to 73. East winds 10 to 20 mph. Chance of rain 40 percent.
East Kaua’i
Tonight: Mostly cloudy with scattered showers. Lows 67 to 74. Northeast winds up to 10 mph. Chance of rain 50 percent.
Wednesday: Partly sunny with scattered showers. Highs 76 to 83. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.
Wednesday Night: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Scattered showers. Lows 66 to 74. Northeast winds 10 to 20 mph. Chance of rain 50 percent.
Detailed Forecast
Synopsis
The moist trades we have been experiencing will give way to drier trade winds beginning tonight. A consistent pattern of mostly moderate but occasionally strong trades should continue well into next week and perhaps beyond. Wind speeds will increase Wednesday through Thursday night, possibly to wind advisory level, then decrease slightly this weekend.
Discussion
Radar showed scattered showers over the Kona slopes this afternoon, along with isolated windward and mauka showers on all islands. Cloud cover ranged from mostly clear to overcast, with the clearer conditions generally over leeward areas. Showers should weaken around sunset, but a few will continue overnight mainly windward and mauka.
Models remain consistent showing trade winds drying out and increasing in speed through Thursday. Higher wind speeds, potentially reaching wind advisory level, will arrive tomorrow and continue into Friday and perhaps Friday night. Showers will decrease both in number and intensity once the drier air arrives, with the main drying occurring Wednesday afternoon into the evening.
A consistent moderate to occasionally strong trade wind flow is expected to continue through the weekend and well into next week as a large surface high to our north remains strong enough to dominate our weather. A band or two of enhanced moisture may arrive after the weekend, but it's too soon to time that out reliably.
Aviation
Moderate to locally fresh trade winds will strengthen on Wednesday as the atmosphere gradually becomes more stable. Periods of MVFR conditions will primarily affect windward mountain areas, and AIRMET Sierra for mountain obscuration may be needed tonight and tomorrow morning, with drier conditions settling over the islands Wednesday afternoon. Conditions are borderline for moderate low level turbulence this afternoon, but the set up will become increasingly conducive tonight and Wednesday, which will require AIRMET Tango.
Marine
Locally fresh trades become strong with localized near-gales during the latter half of the week. The Small Craft Advisory (SCA) remains in effect and will eventually be expanded to all waters as winds and seas build later this week.
Small, short to medium period NNW swell filling in today. This will be followed later this week by a small NNW swell emanating from a strong low near the Aleutian Islands. A series of small, long period SSW swells supports near-average surf along S shores. Meanwhile, strengthening trades maintain elevated surf and short period fresh swell along E facing shores into next week.
HFO Watches/Warnings/Advisories
Small Craft Advisory until 6 PM HST Wednesday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Maalaea Bay, Pailolo Channel.
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Data Courtesy of NOAA.gov
