West Side

Today: Mostly sunny. Scattered showers in the afternoon. Highs 80 to 87. Northeast winds up to 15 mph. Chance of rain 40 percent.

Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 72 to 79. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers. Highs 81 to 89. Northeast winds up to 10 mph. Chance of rain 50 percent.

South Side

Today: Sunny. Isolated showers in the afternoon. Highs around 87. North winds 10 to 15 mph. Chance of rain 20 percent.

Tonight: Mostly clear. Isolated showers after midnight. Lows 73 to 81. North winds up to 15 mph. Chance of rain 20 percent.

Friday: Mostly sunny with isolated showers. Highs around 89. North winds 10 to 15 mph decreasing to up to 15 mph in the afternoon. Chance of rain 20 percent.

North Shore

Today: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs around 82 near the shore to around 69 near 5000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 75 near the shore to around 61 near 5000 feet. Light winds becoming southeast up to 10 mph after midnight. Chance of rain 50 percent.

Friday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 80 to 85 near the shore to around 71 near 5000 feet. East winds 10 to 15 mph. Chance of rain 70 percent.

Central Maui

Today: Mostly sunny. Scattered showers in the afternoon. Highs 81 to 88. North winds 10 to 15 mph. Chance of rain 30 percent.

Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows around 75. Light winds. Chance of rain 50 percent.

Friday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 83 to 89. Northeast winds 10 to 15 mph. Chance of rain 50 percent.

Upcountry

Today: Sunny. Isolated showers in the afternoon. Highs around 68 at the visitor center to around 73 at the summit. Light winds. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows around 57 at the visitor center to around 50 at the summit. East winds up to 10 mph shifting to the southeast after midnight. Chance of rain 50 percent.

Friday: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 73 at the visitor center to around 70 at the summit. East winds up to 15 mph. Chance of rain 50 percent.

East Maui

Today: Mostly sunny with isolated showers in the morning, then partly sunny with scattered showers in the afternoon. Highs around 82 near the shore to around 69 near 5000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Tonight: Mostly cloudy with scattered showers. Lows around 75 near the shore to around 61 near 5000 feet. Light winds becoming southeast up to 10 mph after midnight. Chance of rain 50 percent.

Friday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 80 to 85 near the shore to around 71 near 5000 feet. East winds 10 to 15 mph. Chance of rain 70 percent.

Lanai City

Today: Sunny. Highs 72 to 82. Northeast winds up to 15 mph in the morning becoming light.

Tonight: Clear in the evening, then partly cloudy with isolated showers after midnight. Lows around 71. Light winds. Chance of rain 20 percent.

Friday: Mostly sunny in the morning then becoming partly sunny. Scattered showers. Highs 79 to 86. Light winds. Chance of rain 40 percent.

Kaunakakai

Today: Sunny. Isolated showers in the afternoon. Highs 71 to 91. Northeast winds up to 10 mph. Chance of rain 20 percent.

Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy with scattered showers after midnight. Lows 64 to 78. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 40 percent.

Friday: Partly sunny with scattered showers. Highs 78 to 92. Light winds becoming east up to 10 mph in the afternoon. Chance of rain 50 percent.

Detailed Forecast

Synopsis

Increased shower activity is expected through Friday as trade winds weaken. We're continuing to monitor Tropical Depression Two-C which could strengthen into a tropical cyclone with impacts to the state possible late Saturday through late Monday. There remains uncertainty in the details of the forecast so please continue to monitor in the coming days for additional information.

Discussion

Weak trade winds today will allow for a sea breeze to develop, increasing chances of showers in some leeward areas. Winds will increase late Friday and veer easterly. Typical trade showers will return over windward and mauka areas, most common at night. Forecast for Saturday will be influenced by how the tropical system to the east-southeast of the state evolves. Current forecast maintains typical trade wind showers and increasing winds.
Tropical Depression Two-C has developed 960 miles east-southeast of Hilo. The first look at the potential track keeps the storm south of the Big Island, but it is still early in the forecast process and the track could shift either north or south in coming advisory cycles. Impacts from rain, wind, and surf can be experienced well outside the center of the storm so do not focus too much on the exact track. Current guidance indicates that precipitation will increase on the east side of the state Saturday night into Sunday, spreading west Sunday night into Monday. The timing, direction, and magnitude of the strongest winds remain highly dependent on the track and intensity of the system.
In anticipation of critical new updates with each of the advisory packages issued by the National Hurricane Center (NHC), NWS Honolulu will delay the issuances of our typical forecast package products (AFD, SFT, PFM, ZFP, SRF, CWF, etc) until after the release of NHC's suite of products, to incorporate the latest and most up-to-date information on Tropical Depression Two-C.

Aviation

A surface trough passing over the islands will weaken winds allowing for sea/land breeze development. Afternoon SHRA are possible over leeward and interior areas with isol SHRA over mauka and windward spots overnight. MVFR conds can be expected in SHRA, otherwise VFR prevails.
No AIRMETs are currently in effect.

Marine

High pressure to the far northeast will gradually weaken over the next couple of days. Additionally, a trough northeast of the islands will track northwestward across the offshore waters, leading to a period of light and variable winds today for most waters, allowing daytime sea breezes and overnight land breezes to become established. By late Friday, moderate to locally fresh trades will begin to build back into the region as the trough exits to the northwest, high pressure drifts southward closer to the island chain, and newly developed Tropical Depression Two-C nears the state from the southeast. The forecast for this weekend will depend significantly on the uncertain track of this tropical cyclone.
Surf along south facing shores will remain slightly below average through Thursday. A long period south-southwest swell generated from gales just south and east of New Zealand will begin arriving late Thursday into Friday, boosting surf to near average by Friday night. Surf along east facing shores also remains below average with weak trades, then builds this weekend as the trades restrengthen. This will be compounded by a southeast swell generated by Tropical Depression Two-C that will build through Sunday and could approach advisory levels. North facing shores will remain tiny through Friday, with a slight bump from Lala swell (290 to 300 degrees) possible this weekend.

Fire weather

Issued at 504 AM HST Thu Aug 20 2026
Trade winds will weaken today, increasing chances of showers for the leeward side of the islands. Trade winds increase over the weekend with showers switching to windward. The inversion is 6000 to 7000 ft. Increased wind and rain possible across the state late in the weekend into early next week.

HFO Watches/Warnings/Advisories

None.

Data Courtesy of NOAA.gov