0-3 foot
0-2 foot
1-4 foot
2-4 foot


The trade winds will keep moderate choppy surf along east facing shores of most islands into early next week. In addition, wave model guidance continues to indicate small mid- to long-period east swells from distant east Pacific Tropical Cyclones Irwin and Hillary may reach the islands starting later this weekend. These swells will need to be monitored for timing details and resultant surf heights in case surf might unexpectedly approach the High Surf Advisory criteria along some east facing shores.

A small mid- to long-period west swell, which was produced by a distant typhoon in the west Pacific, has started to arrive at the Hanalei Buoy early this morning. Assuming this swell increases beyond this small initial pulse later today, it may provide a slight boost to surf heights along some exposed west facing shores. However, Niihau and Kauai will likely block much of this swell energy from the beaches on the remaining islands.

Elsewhere, a series of small mid- to long-period southeast and southwest swells will maintain small background surf along most south facing shores through the middle of next week.

A surface high far northeast of the islands will maintain moderate to locally strong trade winds across the islands this weekend. Trade wind speeds are forecast to remain near the Small Craft Advisory (SCA) criteria over Ma`alaea Bay and the Pailolo and Alenuihaha Channels through Sunday night. The trade winds will also likely strengthen over the waters adjacent to the southern Big Island, so a SCA has been added for the waters south of the Big Island starting this evening. The latest forecast indicates the trades will weaken slightly early next week, so we do not anticipate SCA conditions will develop again from Monday into mid- week.

Hawaii Wave Height Model

Hawaii Swell Period Model
Hawaii Swell Height Model


Tide Predictions

Low tide at Kahului was 0.5 foot at 1:05 AM late last night, rising to a high of 1.4 foot at 7:26 AM this morning, then dropping to a low of 1.0 foot at 12:13 PM just after noon, before once again rising to a high of 1.7 foot at 6:28 PM early this evening

The sunrise was at 05:58 am this morning and will set at 07:06 pm this evening. The Moon is currently 6 days old, and is in a Quarter phase. The next Waxing Gibbous will occur at 6:12 PM on Monday, August 7th.

Hawaii Wind Report

Maui Weather

90°/96°
Wind: NE at 24 mph
Sunrise: 6:06 AM
Sunset: 6:50 PM
current observations as of 1pm August 21st, 2017

Weather Outlook for Saturday

Moisture associated with the remnants of former Tropical Cyclone Greg will continue to influence the Big Island today, with drier conditions overspreading the smaller islands. Showers will favor windward areas, but will reach leeward locales from time to time. Drier weather will return to the entire island chain tonight, with a typical trade wind weather pattern then expected through much of next week. Trade winds will continue through the next week as a ridge of high pressure remains to the north of the islands.

Currently at the surface, the remnant trough of former Tropical Cyclone Greg is located around 200 miles south-southeast of South Point, while a 1026 mb high is centered around 1650 miles northeast of Honolulu. The resulting gradient is driving moderate trade winds across the island chain early this morning. Infrared satellite imagery and surface observations indicate partly to mostly cloudy conditions in windward areas, with partly cloudy skies in most leeward locales. Radar imagery shows a few light showers moving into windward areas of the smaller islands, with more shower activity affecting windward sections of the Big Island. Main short term concern revolves around rainfall trends.

Saturday, The remnants of Greg will slide by to the south of the Big Island, while high pressure remains anchored far northeast of the State. This will keep a moderate trade wind flow in place across the island chain. MIMIC total precipitable water imagery continues to depict a very moist airmass in place over and upstream of the islands, with PW values ranging from 1.7 to 2.0 inches. Despite this moist airmass in place, there remains very little in the way of showery low clouds upstream of the smaller islands. Upstream of the Big Island is a different story, with quite a bit of showery low cloud seen in satellite imagery. As a result, mainly widely scattered windward showers and isolated leeward showers are expected across the smaller islands, mainly this morning. Across the Big Island, fairly showery weather will likely continue in windward areas this morning, with conditions then beginning to dry out this afternoon. Satellite imagery shows that moisture has been trapped over leeward sections of the Big Island due to the eddies around the northern and southern tips of the island, so some localized downpours and even possibly a rumble of thunder will be possible here this afternoon.

Tonight through next Friday, High pressure north of the islands will keep moderate trade winds blowing through the end of next week. Any lingering deep moisture over the Big Island will shift southwestward this evening, with a drier and more stable airmass moving back in. Overall, we should see a more typical trade wind shower pattern through the period, with scattered windward showers and isolated leeward showers, mainly during the overnight and early morning hours.

Central Valley (Kahului, Spreckelsville):

Partly cloudy. Isolated showers after midnight. Lows 68 to 74. Northeast winds 10 to 15 mph with gusts to 30 mph. Chance of rain 20 percent.

Leeward West (Lahaina, Ka`anapali):

Breezy. Partly cloudy with isolated showers. Lows 69 to 76. East winds 15 to 20 mph. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

Partly cloudy in the evening then becoming mostly cloudy. Breezy. Scattered showers. Lows 61 to 73. East winds 10 to 20 mph. Chance of rain 50 percent.

Windard Haleakala (Hana, Haiku, Makawao):

Mostly cloudy with scattered showers. Lows around 71 at the shore to around 55 at 5000 feet. East winds 10 to 15 mph with gusts to 30 mph. Chance of rain 50 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

Partly cloudy. Isolated showers in the evening. Lows around 71 at the shore to 55 to 60 upcountry. East winds around 10 mph early in the evening becoming light, then becoming east up to 10 mph early in the morning. Gusts up to 25 mph. Chance of rain 20 percent.

Haleakala Summit

Mostly clear with isolated showers. Lows 48 to 55. East winds 10 to 15 mph. Chance of rain 20 percent.

Photo of the Day

Surf Photo of the Day - July 29th, 2017