West Side

Today: Partly sunny. Breezy. Highs 80 to 86. Northeast winds 10 to 25 mph.

Tonight: Mostly cloudy. Breezy. Lows 68 to 75. East winds 10 to 20 mph.

Monday: Breezy. Mostly cloudy with isolated showers in the morning, then sunny in the afternoon. Highs 81 to 86. East winds 10 to 20 mph decreasing to up to 20 mph in the afternoon. Chance of rain 20 percent.

South Side

Today: Partly sunny. Breezy. Highs around 89. Northeast winds up to 25 mph.

Tonight: Mostly cloudy. Breezy. Lows 68 to 76. Northeast winds up to 20 mph.

Monday: Mostly cloudy in the morning then clearing. Highs around 89. Northeast winds up to 15 mph.

North Shore

Today: Breezy. Mostly cloudy with scattered showers. Highs 79 to 85 near the shore to around 66 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 71 near the shore to around 52 near 5000 feet. East winds up to 20 mph increasing to 10 to 20 mph after midnight. Chance of rain 50 percent.

Monday: Mostly cloudy in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 78 to 84 near the shore to around 66 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Central Maui

Today: Partly sunny. Breezy. Highs 82 to 89. Northeast winds 10 to 25 mph.

Tonight: Mostly cloudy. Breezy. Lows around 70. Northeast winds 10 to 20 mph.

Monday: Mostly cloudy in the morning then clearing. Breezy. Highs 82 to 89. Northeast winds up to 25 mph.

Upcountry

Today: Partly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 64 at the visitor center to around 71 at the summit. East winds up to 20 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows 44 to 54. East winds up to 20 mph. Chance of rain 50 percent.

Monday: Breezy. Mostly cloudy with scattered showers in the morning, then sunny with isolated showers in the afternoon. Highs around 63 at the visitor center to around 69 at the summit. East winds up to 25 mph. Chance of rain 50 percent.

East Maui

Today: Breezy. Mostly cloudy with scattered showers. Highs 79 to 85 near the shore to around 66 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Tonight: Breezy. Mostly cloudy with scattered showers. Lows around 71 near the shore to around 52 near 5000 feet. East winds up to 20 mph increasing to 10 to 20 mph after midnight. Chance of rain 50 percent.

Monday: Mostly cloudy in the morning then becoming mostly sunny. Breezy. Scattered showers. Highs 78 to 84 near the shore to around 66 near 5000 feet. East winds up to 25 mph. Chance of rain 50 percent.

Lanai City

Today: Partly sunny. Breezy. Highs 73 to 81. Northeast winds 10 to 20 mph.

Tonight: Mostly cloudy. Breezy. Lows around 65. Northeast winds up to 20 mph.

Monday: Mostly cloudy in the morning then clearing. Breezy. Highs 73 to 81. Northeast winds up to 10 mph shifting to the east up to 20 mph in the afternoon.

Kaunakakai

Today: Partly sunny. Breezy. Highs 72 to 89. East winds 10 to 20 mph.

Tonight: Mostly cloudy. Breezy. Lows 60 to 74. East winds 10 to 20 mph shifting to the northeast up to 20 mph after midnight.

Monday: Breezy. Partly sunny with isolated showers in the morning, then sunny in the afternoon. Highs 72 to 90. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Breezy trades will generally focus clouds and showers over windward and mauka through the week, especially at night and during the early morning hours.

Discussion

A fairly typical breezy summertime trade wind pattern can be expected through the week, with only minor fluctuations in wind speeds and rain chances expected.
Surface high pressure to the north and northeast of the state will maintain breezy trades through at least Tuesday. Model guidance indicates that the local pressure gradient may fluctuate some midweek as the two areas of high pressure merge into one and build to the far northeast of the state, leading to some variation in trade wind speeds…but generally speaking, breezy conditions can be expected through the week. Looking aloft, a weak upper level low will remain just west of Kauai today, possibly leading to a slight uptick in windward and mauka showers for this end of the state. However, these showers are expected to be light as the strong temperature inversion prevents any substantial vertical development. Mid level ridging will build over the state as the aforementioned upper low retreats northwestward tomorrow, maintaining stable conditions through the rest of the week.
In this stable, breezy tradewind pattern, showers will favor windward and mauka areas overnight, along with the Kona slopes of the Big Island each afternoon, as pockets of low level moisture filter in on the trades.

Aviation

Locally breezy trade winds will persist through tomorrow and will continue to focus incoming low clouds and showers over windward and mauka areas. Brief MVFR ceilings and visibility will be possible in any showers. Otherwise, VFR conditions are expected to prevail.
AIRMET Tango is in effect for tempo moderate turbulence leeward of mountains across all islands. This AIRMET will likely continue over the next couple of days as breezy trade winds persist.

Marine

High pressure north of the region will continue to produce fresh to locally strong trade winds throughout the week. A Small Craft Advisory (SCA) for the windier waters and channels near Maui and the Big Island was extended in time through Monday night, and this advisory will likely continue for these windier waters through much of the week.
A series of small, long-period, south swells will help boost surf heights along south facing shores though the week. The first of these swells will fill in today and Monday, followed by another round from Wednesday into Thursday.
Rough and choppy surf along east facing shores will continue this week. Surf will remain nearly flat along north facing shores throughout the forecast period.

HFO Watches/Warnings/Advisories

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

Data Courtesy of NOAA.gov