Photo Credit: Sebastien Gabriel

West Kaua’i

Today: Sunny and breezy. Isolated showers in the morning. Highs 86 to 92 near the shore to around 78 above 3000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Isolated showers after midnight. Lows around 73 near the shore to around 63 above 3000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

Monday: Mostly sunny with isolated showers. Highs 86 to 92 near the shore to around 78 above 3000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

South Kaua’i

Today: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 85 to 91. East winds 15 to 20 mph. Chance of rain 50 percent.

Tonight: Breezy. Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 71 to 76. East winds 15 to 20 mph. Chance of rain 50 percent.

Monday: Breezy. Partly sunny with scattered showers. Highs 84 to 91. East winds 15 to 20 mph. Chance of rain 50 percent.

Kaua’i Mountains

Today: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 75 to 85 in the valleys to around 68 above 4000 feet. East winds 10 to 20 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then numerous showers after midnight. Lows around 69 in the valleys to around 60 above 4000 feet. East winds 10 to 25 mph. Chance of rain 70 percent.

Monday: Partly sunny. Breezy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 74 to 85 in the valleys to around 68 above 4000 feet. East winds 10 to 20 mph. Chance of rain 70 percent.

North Kaua’i

Today: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs 78 to 89. Southeast winds up to 20 mph shifting to the east 10 to 20 mph in the afternoon. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Scattered showers. Lows 67 to 75. East winds 10 to 20 mph. Chance of rain 50 percent.

Monday: Partly sunny in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 77 to 89. East winds 10 to 20 mph. Chance of rain 50 percent.

East Kaua’i

Today: Breezy. Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 75 to 88. East winds 10 to 20 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows 66 to 78. East winds 10 to 15 mph. Chance of rain 50 percent.

Monday: Breezy. Partly sunny with scattered showers. Highs 74 to 88. East winds 10 to 20 mph. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Locally breezy trade winds will prevail into next week. Partly to mostly cloudy skies across windward and mauka areas with scattered showers mainly during the overnight and early mornings. Partly cloudy with isolated showers leeward.

Discussion

High pressure remains centered far north of the main Hawaiian Islands driving locally breezy easterly trade winds across the state. Latest satellite and radar imagery continues to show scattered to broken low clouds with scattered showers moving into windward and mauka sections of Kauai and Oahu. Comparatively stable closed-cell cumulus clouds are moving onto windward Big Island with isolated showers. Expect decreasing shower coverage by midday across the smaller islands with steady clouds and showers impacting the windward Big Island today.
Very little change is anticipated through the next week with only minor fluctuations in trade wind speeds each day and a continued stable atmosphere. Mostly sunny/clear conditions are expected leeward, while partly to mostly cloudy skies and few passing showers are expected windward and mauka sides of the islands. Any passing showers are most likely to occur during the overnight through early morning hours. However, daytime heating will lead to sea breeze development and cloud build ups along the Kona slopes of the Big Island.

Aviation

A high pressure ridge far north of the Hawaiian Islands will continue to produce moderate to breezy trade winds through at least Monday. Brief showers will develop, mainly over windward and mountain areas, favoring the overnight to early morning hours. VFR conditions will prevail outside of showers.
AIRMET Tango remains in effect for moderate low level turbulence over and downwind of island mountains. Conditions are expected to persist through at least Monday.

Marine

Fresh to strong easterly trade winds will continue through the week as high pressure remains positioned far north of the area. As a result, no changes are anticipated to the Small Craft Advisory in place for the windier waters and channels around Maui County and the Big Island through the week.
Surf along south facing shores will trend up Monday as a long- period southwest swell from the Tasman Sea arrives and begins to move through. Observations at the American Samoa PacIOOS buoy showed this swell peaking early Saturday, which will result in a local peak between Tuesday and Wednesday. A return of smaller surf with mainly background southerly sources is expected later this week.
Surf along east facing shores will remain rough and choppy each day due to the persistent fresh onshore breezes. Wave guidance shows the peak period holding around 6-7 seconds through much of the week.
As we head into August, water levels are running higher than predicted (0.3 to 0.6 ft) statewide due to a combination of our peak annual tides and a sea level anomaly moving through. This will lead to minor coastal flooding through the afternoon periods around the peak daily high tides each day through midweek for the typical vulnerable low-lying coastal areas and beaches. See the latest Coastal Flood Statement for more details.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Wednesday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

Data Courtesy of NOAA.gov