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Weather RadarRegional forecast
Regional Kaua`i Weather Forecast May 04, 2026
West Kaua’i
Tonight: Partly cloudy with isolated showers. Lows around 67 near the shore to around 58 above 3000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.
Monday: Mostly sunny with isolated showers. Highs 81 to 86 near the shore to around 73 above 3000 feet. Northeast winds up to 10 mph in the morning becoming light. Chance of rain 20 percent.
Monday Night: Partly cloudy. Isolated showers after midnight. Lows around 67 near the shore to around 57 above 3000 feet. Light winds. Chance of rain 20 percent.
South Kaua’i
Tonight: Mostly cloudy with scattered showers. Lows around 69. Northeast winds 10 to 15 mph. Chance of rain 50 percent.
Monday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 75 to 85. Northeast winds 10 to 15 mph. Chance of rain 50 percent.
Monday Night: Mostly cloudy with scattered showers. Lows around 68. Northeast winds up to 10 mph. Chance of rain 50 percent.
Kaua’i Mountains
Tonight: Mostly cloudy with numerous showers. Lows 61 to 67 in the valleys to around 56 above 4000 feet. East winds up to 15 mph. Chance of rain 70 percent.
Monday: Partly sunny. Numerous showers in the morning, then scattered showers in the afternoon. Highs 73 to 79 in the valleys to around 64 above 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.
Monday Night: Mostly cloudy with scattered showers. Lows 59 to 66 in the valleys to around 55 above 4000 feet. Light winds. Chance of rain 50 percent.
North Kaua’i
Tonight: Mostly cloudy with scattered showers. Lows 62 to 71. East winds up to 15 mph. Chance of rain 50 percent.
Monday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 74 to 82. East winds up to 15 mph. Chance of rain 50 percent.
Monday Night: Partly cloudy with scattered showers. Lows 62 to 70. East winds up to 10 mph in the evening becoming light. Chance of rain 40 percent.
East Kaua’i
Tonight: Mostly cloudy with scattered showers. Lows 62 to 72. Northeast winds 10 to 15 mph. Chance of rain 50 percent.
Monday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 73 to 82. Northeast winds 10 to 15 mph. Chance of rain 50 percent.
Monday Night: Mostly cloudy with scattered showers. Lows 61 to 71. Northeast winds around 10 mph in the evening becoming light. Chance of rain 50 percent.
Detailed Forecast
Synopsis
A broad high pressure ridge north of the islands will produce moderate trade winds through Monday. Wind speeds will weaken from Tuesday through Thursday as a weak surface trough moves into the island chain. Trade winds slowly return by the end of next week, reaching moderate wind speeds by next Sunday, as the stalled front north of the islands diminishes and a broad ridge builds back into the region.
Discussion
Clouds and showers were once again focused on windward and mauka areas this afternoon. Trade winds were averaging 10 to 20 mph, with gusts near 30 mph in the typical breezy areas. These showers are forecast to continue into the night, and winds are forecast to slowly decrease after sunset.
Weak northwest flow aloft will become westerly Monday night as a large upper level low well to our north moves east across the Pacific. A weak surface trough will move toward the state, resulting in trades becoming southeast winds Monday night into Tuesday. The trough will enter the west end of the state Tuesday night, and winds behind the front will become light northerly or northwesterly. There is low confidence at this time on how far the trough will get, and the latest guidance indicates it will stall around Maui Wednesday night. East to southeast winds will develop Thursday night through Sunday as the trough recedes to the west. Looking very long range, a stronger trough/cold front may approach the state late next weekend.
Moisture will remain rather limited through the next week, with PW values near to or a little over an inch for most of the period. There are some indications that moisture may increase Thursday into next weekend, but confidence is low. In general, we will maintain trade-wind showers Monday and Tuesday, then switch to a land-breeze / sea-breeze pattern Wednesday and Thursday. This means showers will be mainly windward and mauka early in the week, transitioning to afternoon inland showers and mostly dry nights Wednesday and Thursday. As trades return late in the week, showers will become mainly windward and mauka again.
Aviation
Moderate to breezy easterly trades will persist through tonight with clouds and brief showers favoring windward sites. Expect periods of MVFR ceilings and visibility in showers, otherwise widespread VFR is expected. Trade wind flow should weaken slightly during the day on Monday, with the weakening trend set to continue through mid-week.
There are currently no AIRMETs in effect, though AIRMET SIERRA may need to be added to north through east portions of select islands tonight as shower activity increases.
Marine
Fresh to locally strong trade winds will through much of the night as a stalled front weakens about 225 nm northwest of Kauai and surface high pressure farther to the northwest moves eastward. A Small Craft Advisory has been issued around Big Island and Maui County for tonight due to an expected short-lived increase in the trades. The surface high will steadily erode on Monday, leading to a steady decline in the trades. Another front passing north of the islands Tuesday and Wednesday will disrupt the trade winds. Gentle to moderate trade winds are expected to redevelop Thursday and Friday.
The current small northwest swell will decline tonight. A moderate northwest swell will build on Monday and produce surf above seasonal average during the peak Monday night and early Tuesday. This swell will slowly decline late Tuesday and Wednesday. A larger northwest swell could produce surf near the High Surf Advisory level Thursday, then lower Friday into next weekend.
A south-southwest swell will produce surf around seasonal average into tonight and will gradually decrease Monday and Tuesday, with mainly small background surf along south facing shores through the rest of the week.
Trade wind swell will slowly lower below seasonal average on Monday and will remain small through the remainder of the week.
HFO Watches/Warnings/Advisories
Small Craft Advisory until 6 AM HST Monday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Maalaea Bay, Pailolo Channel.
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Data Courtesy of NOAA.gov
