Weather Forecast

Maui Weather Forecast for July 19, 2021

July 19, 2021, 7:15 AM HST
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Photo Credit: Tyler Rooke

West Side

Today: Isolated showers before 10am. Mostly sunny, with a high near 88. Windy, with an east northeast wind 20 to 25 mph decreasing to 13 to 18 mph in the morning. Winds could gust as high as 36 mph. Chance of precipitation is 20%.

Tonight: Mostly clear, with a low around 75. Breezy, with an east northeast wind 18 to 22 mph, with gusts as high as 30 mph.

Tuesday: Sunny, with a high near 88. Breezy, with an east northeast wind 11 to 18 mph, with gusts as high as 25 mph.

South Side

Today: Isolated showers after 10am. Sunny through mid morning, then becoming mostly cloudy, with a high near 89. East wind 5 to 8 mph becoming light and variable in the afternoon. Chance of precipitation is 20%.

Tonight: Mostly clear, with a low around 70. Light and variable wind becoming east northeast 5 to 8 mph in the evening.

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Tuesday: Isolated showers after noon. Sunny, with a high near 89. East wind 6 to 10 mph. Chance of precipitation is 20%.

North Shore

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Today: Scattered showers before 10am. Mostly sunny, with a high near 86. Windy, with an east wind 22 to 24 mph, with gusts as high as 34 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Isolated showers. Partly cloudy, with a low around 71. Windy, with an east wind 15 to 23 mph, with gusts as high as 32 mph. Chance of precipitation is 20%.

Tuesday: Isolated showers before noon. Mostly sunny, with a high near 86. Breezy, with an east wind 15 to 18 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

Central Maui

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Today: Scattered showers before 10am. Mostly sunny, with a high near 87. Breezy, with a northeast wind around 17 mph, with gusts as high as 24 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Mostly clear, with a low around 72. Breezy, with an east northeast wind 11 to 17 mph, with gusts as high as 24 mph.

Tuesday: Sunny, with a high near 87. Breezy, with an east northeast wind 13 to 15 mph, with gusts as high as 21 mph.

Upcountry

Today: Mostly sunny, with a high near 75. Southeast wind around 8 mph becoming west in the afternoon.

Tonight: Mostly cloudy, then gradually becoming clear, with a low around 58. West wind 7 to 11 mph becoming east in the evening.

Tuesday: Sunny, with a high near 75. East northeast wind 6 to 11 mph.

East Maui

Today: Showers likely, mainly before 10am. Mostly cloudy, with a high near 80. Breezy, with an east wind 10 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

Tonight: Scattered showers. Mostly cloudy, with a low around 72. East wind 10 to 13 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday: Scattered showers. Partly sunny, with a high near 80. East wind around 14 mph, with gusts as high as 18 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Lanai City

Today: Sunny through mid morning, then becoming mostly cloudy, with a high near 80. Breezy, with a northeast wind 18 to 21 mph, with gusts as high as 29 mph.

Tonight: Mostly clear, with a low around 66. Breezy, with a northeast wind 16 to 21 mph, with gusts as high as 29 mph.

Tuesday: Isolated showers after noon. Sunny, with a high near 78. Breezy, with an east northeast wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

Kaunakakai

Today: Isolated showers before 10am. Mostly sunny, with a high near 85. Breezy, with an east wind 15 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

Tonight: Isolated showers after midnight. Partly cloudy, with a low around 74. Breezy, with an east wind 7 to 16 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.

Tuesday: Isolated showers before noon. Sunny, with a high near 84. Breezy, with an east northeast wind 16 to 22 mph, with gusts as high as 31 mph. Chance of precipitation is 20%.

Detailed Forecast

Synopsis

Trade winds will persist through the rest of the new work week as an area of surface high pressure remains north of the islands. The trade winds will strengthen today to locally very windy, then weaken slightly to moderate to strong after Tuesday. Showers will be favoring the windward and mauka areas, especially during the nights and early morning hours. Light rainfall amounts is expected through the week.

Discussion

The area of drier air that descended down on the islands last evening is being replaced by a band of clouds and embedded showers. Expect a somewhat showery kind of morning up to around 8 am HST before the frequency of these showers become less. Scattered windward and mauka showers, mainly light, is expected for the rest of the day, as the band dissipates. But this is expected to be the norm for the rest of the week, that is showers favoring the windward and mountain areas, especially nights and mornings.
The trade winds will continue to blow across the area the rest of this week. In the short term, this cloud band about to cross the islands is expected to usher in a bump up in the trades, resulting in some localized very strong trades. A Wind Advisory has been posted for the lee side of the Kohala Mountains and the saddle area of the Big Island, which is good through tonight. The satellite derive winds indicated pockets of 20 to 25 knot winds behind or to the north of this cloud band. Much though was given for this Wind Advisory to cover central Maui and Lanai, but the trades may have too much of a east component. Never-the- less, we will be monitoring the situation closely, and if needed, a Wind Advisory will be issued. The high center drifts off to the west Tuesday, allowing a slight slackening of the trades.
Forecast models suggest that the low level inversion is to set up shop over the islands this morning as a mid level ridge eases in. Expect this inversion to hover between 5k and 7k feet through Tuesday before rising to 8 to 9k feet Tuesday night. So through Tuesday, expect the showers to be light and or light drizzle, and confined to the windward and mountain areas.
About Friday through Saturday time frame, the islands may get another boost in the trades as the remnants of Felicia passes far south of the islands. Then about 24 to 36 hours later, Sunday through Monday,the trades will soften to light to moderate speed as the remnants of Tropical Cyclone Guillermo reaches the islands. Beside the easing the trades, the remnants of Guillermo may give the islands a boost trade showers. There is much uncertainty of this forecast at this time. It depend on the track of Guillermo.

Aviation

Trade winds will increase today, becoming quite gusty this afternoon, then remain locally windy through Tuesday as high pressure builds far N of the state. A loosely organized band of showery low clouds will move across all islands this morning, bringing periods of MVFR VIS/CIG in SHRA to windward areas. Coverage may become sufficiently widespread to warrant AIRMET Sierra for mountain obscuration. AIRMET Tango for moderate turbulence over and S through W of island terrain will remain in effect for the foreseeable future.
A weak low aloft moving NW away from the islands will bring some high clouds to the Big Island and Maui County into tonight.

Marine

A strong high pressure ridge north of the Hawaiian Islands will continue to produce strong trade winds and elevated rough seas through the week. These strong winds and rough seas will trend down slightly by Wednesday, and trend higher again by Friday. The Small Craft Advisory (SCA) was expanded to include all coastal waters through Tuesday.
The current south swell will gradually trend lower through Tuesday, with smaller size surf for south facing shores lasting into the weekend. Besides some localized wrap of trade wind swell, surf along most north facing shores will remain essentially flat through mid-week. Tropical Cyclone Felicia, currently in the Eastern Pacific, will not produce large surf due to limited fetch. However, Felicia could bring in some small to moderate mid period surf mainly along the east facing shores of the Big Island later this week.

HFO Watches/Warnings/Advisories

Wind Advisory until 6 AM HST Tuesday for Kohala.
Small Craft Advisory until 6 AM HST Tuesday for all Hawaiian waters.

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Data Courtesy of NOAA.gov

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