0-3 foot
0-2 foot
1-4 am | 4-6+ pm
1-3 foot

Moderate to fresh trade winds will hold through the weekend over the coastal waters. A disturbance is expected to pass south of the state early next week, which will tighten the pressure gradient over the state, and result in an increase of trade winds speeds and seas.

A new long period south swell is expected to build late today, peak on Sunday and fade during the first half of next week. A High Surf Advisory has been issued for all south facing shores beginning at 6 pm HST this evening and continuing through Monday. No other significant swells are expected for next week.

Hawaii Wave Height Model

Tide Predictions

Low tide at Kahului was 0.23 foot at 2:00 PM early this afternoon, rising to a high of 1.86 foot at 2:00 PM early this afternoon, then dropping to a low of 1.25 foot at 2:00 PM early this afternoon, before once again rising to a high of 1.35 foot at 2:00 PM early this afternoon.

The sunrise was at 05:55 am this morning and will set at 07:09 pm this evening. The Moon is currently 9 days old, and is in a Waxing Gibbous phase. The next Full Moon will occur at 8:22 PM on Friday, July 27th.

Hawaii Wind Report

Maui Weather

°/°
Wind: n/a at 0 mph
Sunrise:
Sunset:
current observations as of 8am August 20th, 2018

Weather Outlook for Saturday, 21st July 2018

Summary

Surface high pressure far north-northeast of the islands will maintain a relatively dry trade wind weather pattern across the islands through Sunday morning. Low clouds and light showers transported by the trades will continue across windward and mauka areas. An area of enhanced moisture embedded within the trades is forecast to spread westward across the islands from late Sunday into early next week. This will likely cause an increase in the coverage of low clouds and showers over windward sections from Sunday night into early next week.

Detailed Discussion

A 1034 mb surface high centered near 46N 140W has a surface ridge extending southwest through a point about 1150 miles north of Hilo. There is also a monsoon trough, or area of low pressure, in the deep tropics less than 600 miles south-southeast of South Point on the Big Island. These surface features north and south of the islands are maintaining a relatively tight pressure gradient across the region. As a result, the trade wind flow is moderate to locally breezy over the islands early this morning.

Aloft, an upper-level low is centered near 28N 165W, or about 550 northwest of Lihue, while an upper-level ridge is east of the Big Island. The flow aloft between these features is transporting patches of cirrus clouds across the state from the south and southwest. The atmospheric conditions across the state are also relatively stable early this morning, since the low-level trade wind inversion is around 6 thousand feet at Lihue, and near 7 thousand feet at Hilo. Precipitable water (PW) values range from 1.2 to 1.4 inches. Note that some of this moisture is likely related to the upper-level clouds, so the lower atmosphere remains relatively dry. Radar reflectivity data show scattered showers moving across the coastal waters into the windward side of the Big Island, while isolated showers are moving into the windward sections of some of the smaller islands. However, rainfall totals at gages across the state remain meager, so these showers remain mostly light.

The forecast models show the upper-level ridge east of the Big Island will propagate slowly westward over the islands this weekend. This will produce stable atmospheric conditions across the area. With the relatively low PW values already in place, expect only brief trade shower coverage over some windward sections through Sunday morning.

Changes are expected in the dry trade wind weather pattern starting later this weekend. Looking upstream of the islands, the leading edge of an area of enhanced moisture is evident in satellite imagery about 775 miles east of Hilo. The forecast models are in general agreement that the low-level trade wind flow will eventually transport this area of moisture over the eastern end of the island chain starting Sunday afternoon. This area will continue spreading westward across the remainder of the state from Sunday night into early next week. The current forecast indicates that trade shower coverage will likely increase over windward and mauka areas due to this enhanced moisture. Some brief showers may also occur over leeward sections of the smaller islands, as well as over the Kona slopes of the Big Island each afternoon. Since the upper-level ridge will be in the vicinity of the islands, we do not currently anticipate heavy rainfall early next week.

A trade wind weather pattern is expected to remain in place through the remainder of next week. The trade winds will gradually strengthen with breezy conditions likely starting Tuesday. Low clouds and showers carried by the trades will continue to favor windward and mauka areas.

Central Valley (Kahului, Spreckelsville):

HIGH SURF ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 PM HST MONDAY. Sunny and breezy. Highs around 87. Northeast winds 10 to 20 mph.

Leeward West (Lahaina, Ka`anapali):

HIGH SURF ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 PM HST MONDAY. Breezy. Sunny with isolated showers. Highs 83 to 88. Northeast winds 10 to 25 mph. Chance of rain 20 percent.

Windward West (Wailuku, Waiehu):

Breezy. Mostly cloudy with scattered showers. Lows 61 to 73. Northeast winds 15 to 25 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. Chance of rain 50 percent.

Leeward Haleakala (Kihei, Wailea, Makena):

HIGH SURF ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 6 PM HST MONDAY. Sunny. Isolated showers in the afternoon. Highs around 89 at the shore to 71 to 76 upcountry. Light winds becoming south around 10 mph in the late morning and afternoon. Gusts up to 35 mph. Chance of rain 20 percent.

Haleakala Summit

Mostly clear with isolated showers. Lows around 49 at the visitor center to around 46 at the summit. East winds around 10 mph. Chance of rain 20 percent.