West Kaua’i

Tonight: Partly cloudy. Scattered showers in the evening, then isolated showers after midnight. Lows around 72 near the shore to around 62 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 40 percent.

Wednesday: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs 84 to 91 near the shore to around 76 above 3000 feet. East winds up to 15 mph. Chance of rain 50 percent.

Wednesday Night: Mostly cloudy in the evening then becoming partly cloudy. Scattered showers. Lows around 74 near the shore to around 64 above 3000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

South Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 70 to 76. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Wednesday: Partly sunny with scattered showers. Highs 78 to 89. East winds 10 to 15 mph. Chance of rain 50 percent.

Wednesday Night: Mostly cloudy with scattered showers. Lows 71 to 77. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Kaua’i Mountains

Tonight: Mostly cloudy with scattered showers. Lows around 67 in the valleys to around 59 above 4000 feet. East winds up to 10 mph. Chance of rain 50 percent.

Wednesday: Mostly cloudy. Scattered showers in the morning, then numerous showers in the afternoon. Highs 74 to 81 in the valleys to around 67 above 4000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Wednesday Night: Mostly cloudy with numerous showers. Lows around 69 in the valleys to around 61 above 4000 feet. East winds 10 to 15 mph. Chance of rain 70 percent.

North Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 63 to 73. East winds up to 15 mph. Chance of rain 50 percent.

Wednesday: Partly sunny with scattered showers. Highs 71 to 86. East winds up to 15 mph. Chance of rain 50 percent.

Wednesday Night: Mostly cloudy with scattered showers. Lows 65 to 75. East winds up to 10 mph. Chance of rain 50 percent.

East Kaua’i

Tonight: Mostly cloudy with scattered showers. Lows 66 to 76. Northeast winds 10 to 15 mph decreasing to up to 10 mph after midnight. Chance of rain 50 percent.

Wednesday: Partly sunny with scattered showers. Highs 77 to 86. East winds around 10 mph. Chance of rain 50 percent.

Wednesday Night: Mostly cloudy with scattered showers. Lows 67 to 77. East winds around 10 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Moderate trades deliver showers windward and mauka through the weekend.

Short term update

Moderate trades delivering scattered to numerous showers windward and mauka this evening. Minor adjustment to the inherited forecast to tweak pops upward to more closely match recent radar trends. Otherwise no adjustments necessary.

Prev discussion

Issued at 357 PM HST Tue Jul 14 2026 Radar and satellite imagery show that shower coverage has gradually decreased this afternoon, with remaining activity continuing to favor the western half of the state. Upstream moisture suggests a slight uptick in shower coverage across windward and mauka areas statewide overnight.
High pressure far north of the area will be gradually nudged eastward through the weekend as a series of lows pass through the far northeast Pacific. Another high will then build in behind it from the northwest early next week. The progression of these features, along with two areas of potential tropical development to the south and southwest of the state, will bring subtle ebbs and flows in the local pressure gradient, consequently altering trade wind speeds through the period. Wind speeds will be moderate to locally breezy over the next couple of days, strengthen to become breezy through the weekend, and then potentially weaken slightly once again early next week. The two areas south and southwest of the state being watched for potential tropical cyclone development are not expected to have any direct impacts on Hawaii at this time.
Batches of moisture will filter in on the trades, bringing periodic upticks in windward and mauka showers through the period. While most shower activity will remain focused over windward and mauka areas during the overnight to early morning hours, short- term guidance suggests that the low-level flow will temporarily veer slightly south of east tomorrow. This will increase the potential for isolated sea breeze showers over leeward areas across the state, and may allow convergent boundaries downwind of Molokai to bring showers to leeward Oahu tomorrow afternoon.

Aviation

Moderate trades expected through the forecast period. Low cigs and SHRA should primarily impact windward and mauka locations. MVFR conds possible in SHRA, otherwise VFR prevails.
AIRMET Sierra is in effect for mtn obsc for Kauai, Oahu Maui and the Big Island. Conds should improve in the mid morning hours.

Marine

Issued at 357 PM HST Tue Jul 14 2026 No significant changes to the forecast with the afternoon package. The Coastal Flood statement remains posted for higher than normal tides since we are in the midsts of the afternoon peak tides. Anticipate cancelling that statement by 6 pm today as the high tides begins to subside.
High pressure far north of the islands will maintain a trade wind pattern, however as the high has weakened and lifted away from the islands, trade winds are not quite as strong. Winds across the coastal waters remain below Small Craft Advisory levels. Winds could rebound during the second half of the week as the high sinks southward, tightening the pressure gradient over the islands.
The current small, long-period southwest swell will continue to gradually decline through the middle of the week. A series of overlapping small south and southwest swells will maintain south shore surf, with a larger south swell expected early next week.
Surf along east-facing shores will steadily decline through Wednesday as the trade winds ease. Surf will then hold steady at slightly below seasonal averages along east facing shores through the weekend.
A series of small, long to medium period west to west-northwest swells generated by former Super Typhoon Bavi will be possible throughout the rest of the week. Otherwise, no significant north or northwest swells are expected.
Coastal flooding remains possible this afternoon with the peak monthly high tides, combined with water levels running slightly higher than predicted. The Coastal Flood Statement will be cancelled later this afternoon after the peak of the high tide.

HFO Watches/Warnings/Advisories

None.

Kauai Now Weather is brought to you by Blue Hawaiian Helicopters.

Check out their Kaua‘i Helicopter Tours today!

Data Courtesy of NOAA.gov