Photo Credit: Tyler Rooke

West Side

Today: Isolated showers before noon. Mostly sunny, with a high near 85. East northeast wind 5 to 7 mph becoming calm. Chance of precipitation is 20%.

Tonight: Partly cloudy, with a low around 68. Calm wind becoming east northeast 5 to 8 mph after midnight.

Tuesday: Isolated showers before noon. Mostly sunny, with a high near 85. East northeast wind 8 to 11 mph. Chance of precipitation is 20%.

South Side

Today: Mostly sunny, with a high near 82. Calm wind becoming east northeast 5 to 7 mph in the afternoon.

Tonight: Isolated showers before midnight. Mostly clear, with a low around 64. Light and variable wind becoming northeast 5 to 10 mph after midnight. Chance of precipitation is 20%.

Tuesday: Isolated showers. Mostly sunny, with a high near 81. Northeast wind 10 to 13 mph. Chance of precipitation is 20%.

North Shore

Today: Scattered showers before noon. Mostly sunny, with a high near 83. East wind 11 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.

Tonight: Isolated showers. Partly cloudy, with a low around 66. East wind 8 to 13 mph. Chance of precipitation is 20%.

Tuesday: Isolated showers. Mostly sunny, with a high near 83. Northeast wind around 13 mph. Chance of precipitation is 20%.

Central Maui

Today: Scattered showers before noon. Mostly sunny, with a high near 84. Northeast wind 5 to 10 mph. Chance of precipitation is 40%.

Tonight: Isolated showers before midnight. Partly cloudy, with a low around 66. North wind 5 to 10 mph. Chance of precipitation is 20%.

Tuesday: Isolated showers. Mostly sunny, with a high near 83. Northeast wind 10 to 13 mph. Chance of precipitation is 20%.

Upcountry

Today: Mostly sunny, with a high near 71. Calm wind becoming east 5 to 8 mph in the afternoon.

Tonight: Mostly clear, with a low around 53. Light and variable wind becoming east northeast 6 to 11 mph after midnight.

Tuesday: Mostly sunny, with a high near 70. East northeast wind around 11 mph.

East Maui

Today: Showers likely, mainly before noon. Partly sunny, with a high near 77. East southeast wind 9 to 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Showers likely, mainly before midnight. Mostly cloudy, with a low around 69. East wind 6 to 13 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: Showers likely, mainly before noon. Partly sunny, with a high near 78. East wind 11 to 13 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Lanai City

Today: Mostly sunny, with a high near 75. Calm wind becoming east northeast around 6 mph in the afternoon.

Tonight: Isolated showers before midnight. Partly cloudy, with a low around 62. East northeast wind 5 to 11 mph. Chance of precipitation is 20%.

Tuesday: Isolated showers. Mostly sunny, with a high near 75. East northeast wind 7 to 14 mph, with gusts as high as 18 mph. Chance of precipitation is 20%.

Kaunakakai

Today: Isolated showers before noon. Mostly sunny, with a high near 85. East wind 6 to 13 mph. Chance of precipitation is 20%.

Tonight: Partly cloudy, with a low around 70. East northeast wind 8 to 13 mph becoming light east.

Tuesday: Mostly sunny, with a high near 85. Breezy, with an east northeast wind 13 to 16 mph, with gusts as high as 22 mph.

Detailed Forecast

Synopsis

A ridge north of the area will maintain moderate trade winds through Thursday. Showers will be focused over mainly windward areas, especially during the night and morning hours. The ridge will move over the area Friday, bringing light and variable winds

Discussion

A progressive and zonal weather pattern across the North Pacific basin will keep high and low pressure systems passing by north of the state with little impacts to local Hawaiian weather until Friday and Saturday. Breezy trade winds this past weekend will weaken a bit to moderate levels from Monday through Thursday. Clouds and passing showers will favor windward and mountain areas during this period with typical higher trends in the overnight to early morning hours. A brief increase in the trade wind speeds are forecast from Wednesday night into Thursday as a stronger high pressure system moves across the basin north of the island chain. This increase in trade winds will be brief, as the high center quickly moves eastward away from the area with light winds developing over the region by Friday.
From Friday through Sunday, a cold frontal trough moves into the region from the north, weakening the high pressure ridge north of the island chain, and causing trade winds to vanish on Friday and Saturday. This pressure pattern change with weakening large scale winds will allow local scale land and sea breezes to develop across the main Hawaiian Islands. Weather patterns will then shift to clouds building over island mountain and interior sections with afternoon sea breeze convergence. A few showers will develop in this pattern mainly in the afternoon to early evening hours as the converging sea breezes begin to decrease. Offshore land breezes will begin around sunset, clearing out most of the cloud cover. A weak background easterly wind will modify the land and sea breeze regime on Sunday with a slight increase in windward clouds and shower activity.

Aviation

Trade winds will continue to trend down today, potentially enough for localized sea breezes across some leeward areas through the afternoon hours. Although VFR conditions will prevail through much of the 24-hr period, spotty windward showers will bring brief periods of MVFR CIGS/VSBYS – mainly overnight through the early morning hours.
There are no AIRMETs in place at this time.

Marine

A ridge north of the area will maintain gentle to locally fresh trade winds through Thursday. Winds will shift out of the southeast and weaken Friday as the ridge shifts south.
Swell heights at the NOAA buoys northwest of the main islands are high enough to generate advisory level surf across exposed shores, so a High Surf Advisory is now in effect for north and west facing shores of Niihau, Kauai, Oahu and Molokai as well as for north facing shores of Maui. This advisory is in effect through Tuesday afternoon, but may need to be extended. A larger northwest swell is forecast to build Tuesday night, with another large northwest swell expected Wednesday night and Thursday. These swells may produce warning level surf along north and west facing shores Wednesday through Thursday. Surf is expected to drop back below advisory levels by Friday night.
Surf along east facing shores will subside over the next few days as trade winds weaken. South shore surf will remain small through the coming week.

HFO Watches/Warnings/Advisories

High Surf Advisory until 6 PM Tuesday for north and west facing shores of Niihau, Kauai, Oahu and Molokai and north facing shores of Maui.

Data Courtesy of NOAA.gov