West Kaua’i

Today: Cloudy. Scattered showers in the morning, then numerous showers in the afternoon. Highs around 82 near the shore to around 70 above 3000 feet. Southeast winds up to 10 mph. Chance of rain 70 percent.

Tonight: Cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows around 69 near the shore to around 61 above 3000 feet. Light winds. Chance of rain 70 percent.

Wednesday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs 80 to 85 near the shore to around 73 above 3000 feet. Light winds. Chance of rain 50 percent.

South Kaua’i

Today: Cloudy with scattered showers. Highs 77 to 83. Light winds. Chance of rain 50 percent.

Tonight: Cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows around 69. Light winds becoming northeast up to 10 mph after midnight. Chance of rain 70 percent.

Wednesday: Cloudy with scattered showers. Highs 79 to 85. Northeast winds up to 10 mph. Chance of rain 40 percent.

Kaua’i Mountains

Today: Cloudy. Scattered showers in the morning, then numerous showers in the afternoon. Highs 73 to 79 in the valleys to around 64 above 4000 feet. South winds up to 10 mph in the morning becoming light. Chance of rain 70 percent.

Tonight: Cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 63 to 69 in the valleys to around 59 above 4000 feet. Light winds. Chance of rain 70 percent.

Wednesday: Cloudy with scattered showers. Highs 73 to 79 in the valleys to around 66 above 4000 feet. Light winds. Chance of rain 50 percent.

North Kaua’i

Today: Cloudy. Scattered showers in the morning, then numerous showers in the afternoon. Highs 73 to 82. Southwest winds up to 10 mph in the morning becoming light. Chance of rain 70 percent.

Tonight: Cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 63 to 71. Light winds. Chance of rain 70 percent.

Wednesday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs 74 to 82. East winds up to 10 mph. Chance of rain 40 percent.

East Kaua’i

Today: Cloudy. Scattered showers in the morning, then numerous showers in the afternoon. Highs 72 to 82. South winds around 10 mph in the morning becoming light. Chance of rain 70 percent.

Tonight: Cloudy. Numerous showers in the evening, then scattered showers after midnight. Lows 64 to 73. Light winds. Chance of rain 70 percent.

Wednesday: Cloudy with scattered showers. Highs 73 to 83. Light winds. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Light to moderate rain continues over the western portion of the state. Periods of showery, somewhat unstable conditions are expected to persist through much of the week. Light and variable winds may also promote localized land and sea breeze development. By the latter half of the week, a return to light east to southeast winds will bring generally quieter weather, however, shower activity could increase by the weekend as an upper-level trough approaches from the northwest.

Short term update

Issued at 1010 AM HST Tue Apr 14 2026
This morning's REFS model continues to show an increase of showers over Kauai today especially during the afternoon and evening. While rain is expected to increase, rainfall rates will likely remain modest due to the lack of atmospheric dynamics. Even with the lack of dynamics, a few inches of rain will be possible over the next 24 hours for Kauai. Elsewhere across the state, sea breezes will develop by mid day today and we should see clouds and showers develop over interior areas this afternoon. With precipitable water values higher than normal, some brief downpours are expected at times this afternoon and evening.

Discussion

Issued at 341 AM HST Tue Apr 14 2026
The main shower band has drifted eastward from the previous forecast and is now located over Maui County and the Alenuihaha Channel. Rainfall rates from these showers have been producing below a tenth of an inch per hour. The subtropical jet, currently located just north of the Hawaiian Islands and drifting southward, will help steer these intermittent shower bands over the region for the next several days. Cloud coverage will also be maintained through much of the week, ensuring dewpoints remain high in the upper-60s, leading to noticeably humid conditions. With the lighter surface winds in the forecast, initially from the southeast before becoming variable, any diurnal heating will be enough to trigger land and sea breeze activity. This may bring leeward and interior showers throughout the day, and partial clearing overnight for most of the islands. Otherwise, these weak, intermittent shower bands will persist as they ride the subtropical jet following the southwesterly flow aloft.
Toward the latter half of the week, the surface low pressure system, once anchored just north of the islands, will finally dislodge and move northeastward opening the doors for high pressure to quickly build in its place. Light trades attempt to develop in response, however, latest model guidance depicts an upper-level trough digging down into the vicinity of the state from the northwest. While not overly impressive, nor super impactful currently, it is expected to limit the strength of the trades. That being said, it is worth keeping an eye on the evolution of the upper-level trough to determine if it enhances the ongoing shower activity (especially with the lingering moisture-laden airmass across the state), or if it is simply passing through.
.AVIATION… Issued at 341 AM HST Tue Apr 14 2026
Low cigs and isol SHRA will continue across the islands. MVFR conds possible but VFR should prevail. Winds will generally be driven by land-sea breezes. The forecast generally trends back toward trades tomorrow into Thursday.
No AIRMETs in effect.

Marine

Issued at 341 AM HST Tue Apr 14 2026
A weak surface trough will reside just west of the state through Thursday. This will allow for gentle southeast flow across the waters and locally moderate easterly flow in the typical windy channels surrounding Maui and the Big Island. Surface high pressure building far north of the region will help tighten the pressure gradient and bring moderate to locally fresh easterly trades across the Hawaiian coastal waters Friday into this weekend.
A small, short-period, northwest swell will continue to slowly diminish through the rest of the week and into the weekend.
A small, medium-period, south swell has arrived at the near shore buoys and should provide a boost to surf along south facing shores through late week before gradually subsiding into the weekend.
Surf along east facing shores will remain below seasonal average with lighter than average trade winds near and upstream of the islands forecast through late this week. A slight bump up in surf may occur Friday into this weekend with the increase of easterly flow.

HFO Watches/Warnings/Advisories

None.

Data Courtesy of NOAA.gov