Hilo

Today: Showers likely, mainly before 9am. Partly sunny, with a high near 80. Calm wind becoming east 5 to 7 mph in the morning. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers, mainly between 7pm and 1am. Partly cloudy, with a low around 67. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Scattered showers, mainly between 9am and 1pm. Mostly sunny, with a high near 81. East southeast wind 5 to 8 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Kona

Today: Isolated showers after 1pm. Increasing clouds, with a high near 79. Southeast wind around 6 mph becoming southwest in the afternoon. Chance of precipitation is 20%.

Tonight: Isolated showers before 7pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 67. Calm wind becoming north northwest around 6 mph after midnight. Chance of precipitation is 20%.

Friday: Isolated showers after 1pm. Increasing clouds, with a high near 79. West northwest wind around 7 mph. Chance of precipitation is 20%.

Waimea

Today: Scattered showers before 8am, then scattered showers after noon. Mostly sunny, with a high near 76. Northeast wind 5 to 7 mph becoming calm in the afternoon. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers before midnight. Partly cloudy, with a low around 59. East wind 3 to 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Scattered showers after noon. Mostly sunny, with a high near 76. East northeast wind 3 to 7 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Kohala

Today: Scattered showers before 8am, then scattered showers after noon. Mostly sunny, with a high near 69. East wind around 6 mph becoming calm. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers before midnight. Partly cloudy, with a low around 57. East northeast wind around 6 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Scattered showers after noon. Mostly sunny, with a high near 70. East northeast wind around 6 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

South Big Island

Today: Isolated showers before 8am. Mostly sunny, with a high near 82. Breezy, with an east wind 14 to 17 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

Tonight: Partly cloudy, with a low around 72. Breezy, with an east wind 13 to 16 mph, with gusts as high as 21 mph.

Friday: Mostly sunny, with a high near 82. East wind 8 to 13 mph.

Puna

Today: Showers likely, mainly before 8am. Partly sunny, with a high near 76. Light and variable wind becoming east 5 to 8 mph in the afternoon. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday: Scattered showers, mainly before noon. Partly sunny, with a high near 77. East wind 3 to 8 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Waikoloa

Today: Isolated showers after noon. Mostly sunny, with a high near 82. Calm wind becoming northwest 5 to 7 mph. Chance of precipitation is 20%.

Tonight: Mostly clear, with a low around 67. Calm wind.

Friday: Isolated showers after noon. Mostly sunny, with a high near 82. Calm wind. Chance of precipitation is 20%.

Detailed Forecast

Synopsis

Light to moderate trade winds today will diminish Friday and Saturday with afternoon sea breezes and nighttime land breezes expected. Showers will be limited with clouds increasing in the afternoon hours. Trade wind weather returns Sunday and continues into next week with showers favoring windward and mountain areas.

Discussion

Overnight satellite and radar imagery showed overcast clouds and showers moving into windward areas of Maui and the Big Island, while other windward locations are experiencing passing showers. This trend will continue into the morning hours before partial clearing in the late morning and early afternoon. Leeward locations on the smaller islands may see a stray shower through the early morning hours. A ridge about 200 miles north of Kauai will allow light to moderate trade winds to hold today with protected leeward locations seeing sea breezes and cloud buildups in the afternoon. The ridge will move slowly SE through the day and winds will weaken and turn out of the southeast later tonight. With light southeastly flow expected Friday and Saturday, most island will see a nighttime land breeze and daytime sea breeze regime with increasing afternoon clouds and limited showers over interior sections. Substantial warming aloft with keep the atmosphere stable and showers will be limited in coverage and intensity. The ridge will retreat to the north Sunday and next week, allowing trade winds to return.

Aviation

A weak ridge north of the state will move south slowly today and lighten the winds, which will allow for sea breezes to develop in many areas west of the Big Island. Clouds, and possibly some light showers, will tend to form in the afternoon hours over leeward, interior, and/or mauka sections as sea breezes take hold. Land breezes will develop as the land cools overnight and cloudiness dissipates. VFR conditions will predominate.
No AIRMETs are in effect nor expected through the day.

Marine

A stalled front north of the region will keep a weak ridge in place northeast of the island chain through Saturday. This ridge will build in north of the islands from Sunday onward. Light to moderate trades will prevail through Saturday, then strengthen to moderate to breezy levels from Sunday through the middle of next week. Small Craft Advisories may be needed for the windier waters around Maui and the Big Island during this time period.
Surf along south facing shores will see a series of south swells over the next week. These swells should produce surf heights near the summertime average heights (5 ft) through the middle of next week. The current tiny northwest swell will diminish today, before a new northwest swell builds in from Friday into early Sunday. Surf along east facing shores will remain small due to weak trade winds over and upstream of the island chain.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov