3-5 foot
1-4 foot
1-3 foot
2-4 foot

The current northwest swell peaked at around 5 feet with a wave period of about 14 seconds earlier Sunday. The swell will continue to gradually decline from Sunday evening through Monday with no other significant northwest swells due through the end of the upcoming work week. The fresh to strong trade winds will maintain short period easterly seas of about 7 feet at 8 seconds through Sunday, followed by a decline during the work week. South facing shores will see mainly small south-southwest swells of 2 feet or less through Monday, with possible increase in swell energy Tuesday and Wednesday.

A Small Craft Advisory (SCA) remains in effect for the typically windy waters adjacent to the Big Island and the islands of Maui County, in addition to the Kaiwi Channel and the waters north of Maui County, due to locally strong easterly trade winds. In addition, seas are forecast to be just below the sca threshold of 10 feet over waters exposed to the northwest swell through early Sunday morning. By Sunday, only the typically windy waters adjacent to the Big Island and the islands of Maui County are forecast to remain under the SCA. The SCA is currently in effect through Monday afternoon, but it may need to be extended into mid-week.

Hawaii Wave Height Model

Hawaii Swell Period Model
Hawaii Swell Height Model

Tide Predictions

High tide at Kahului was 2.3 foot at 3:24 AM late last night, dropping to a low of 0.3 foot at 9:25 AM this morning, then rising to a high of 2.3 foot at 3:24 PM early this afternoon, before once again dropping to a low of 0.0 foot at 9:44 PM late this evening

The sunrise was at 06:13 am this morning and will set at 06:25 pm this evening. The Moon is currently 17 days old, and is in a Full Moon phase. The next Waning Gibbous will occur at 9:59 AM on Friday, September 23rd.

Hawaii Wind Report

Maui Weather

Wind: n/a at 0 mph
current observations as of 12pm December 18th, 2018

Weather Outlook for Sunday

The current moist and somewhat unstable atmospheric conditions will gradually be replaced by a drier and increasingly stable air mass moving in from the east through early Sunday morning. Locally breezy trade winds will continue to focus low clouds and moderate showers over windward facing slopes. A more typical trade wind weather pattern is expected starting Sunday, and continuing through Thursday, with an increase in showers possible starting Friday.

A surface ridge extends from a 1028 mb surface high near 34n 152w, or about 950 miles north-northeast of Honolulu, to a point about 800 miles north of Lihue. The tight pressure gradient south of these nearly stationary features is maintaining locally breezy trade winds across the Fiftieth State early this evening. Aloft, large mid and upper level lows are centered near 24n 168w, or about 630 miles miles west-northwest of Lihue. These systems are moving slowly westward.

Abundant moisture remains in place across the island chain, while the atmosphere remains slightly unstable due to the influence of the departing lows aloft. Precipitable water values remain well above normal, with values of near 2 inches across many areas of the state based on satellite data. The early afternoon soundings showed that there was no typical low level trade wind inversion across the state. The presence of the lows aloft continues to generate scattered thunderstorms 200 to 400 miles southwest of the islands. Upper level clouds streaming up toward the islands from the tops of these thunderstorms are maintaining mostly cloudy skies across the state early this evening. Otherwise, radar reflectivity data show scattered showers mainly east and southeast of the Big Island, and over windward facing sides of some of the islands.

Satellite imagery shows drier air upstream of the islands, which is moving toward the area from the east. At the same time, the influence of the lows aloft on the atmosphere over the islands will wane as they continue moving westward away from the state. The forecast models indicate mid-level ridging moving in from the east will eventually allow stable atmospheric conditions to develop over the Big Island, and probably Maui County, with a low level inversion expected to build around 8 thousand feet later tonight. This will confine most trade showers to windward facing slopes over the eastern islands. Deeper moisture is expected to linger over the western end of the state, where trade showers affecting windward and mauka areas, may be transported over to some leeward sections. The thunderstorms far southwest of the islands will continue to produce high clouds that will continue to move over the state. Some of these high clouds may eventually clear out over the eastern end of the island chain before sunrise Sunday morning.

Deep ridging will eventually build over the entire island chain on Sunday, which will allow a stable trade wind weather pattern to develop. The surface high pressure to the north of the islands is forecast to weaken slightly. As a result, trade wind speeds may drop slightly starting Monday. This moderate trade wind flow will carry trade showers mainly over windward facing slopes. So expect rather typical trade wind weather through mid-week, with an increase in rainfall possible toward the end of the work.

Central Valley (Kahului, Spreckelsville):

Mostly clear. Lows 70 to 76. Northeast winds 10 to 15 mph with gusts to 30 mph.

Leeward West (Lahaina, Ka`anapali):

Breezy. Mostly clear with isolated showers. Lows 72 to 78. East winds 15 to 20 mph. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

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

Windard Haleakala (Hana, Haiku, Makawao):

Mostly cloudy with scattered showers. Lows around 76 at the shore to around 58 at 5000 feet. Southeast winds 10 to 15 mph. Chance of rain 50 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Mostly clear. Lows around 74 at the shore to 57 to 64 upcountry. Southeast winds up to 10 mph early in the evening becoming light.

Haleakala Summit

Breezy. Mostly clear with scattered showers. Lows around 51 at the visitor center to around 48 at the summit. Northeast winds 15 to 20 mph. Chance of rain 50 percent.

Photo of the Day

Surf Photo of the Day - September 18th, 2016