Hilo

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 68 to 75 near the shore to around 60 at 4000 feet. Northwest winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs 81 to 86 near the shore to 67 to 72 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Saturday Night: Cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 67 to 73 near the shore to around 60 at 4000 feet. North winds up to 10 mph. Chance of rain 40 percent.

Kona

Rest Of Tonight: Partly cloudy with isolated showers in the evening, then mostly cloudy after midnight. Lows 70 to 77 near the shore to around 59 near 5000 feet. Light winds. Chance of rain 20 percent.

Saturday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 88 near the shore to around 73 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.

Saturday Night: Mostly cloudy. Isolated showers in the evening. Lows 71 to 77 near the shore to 51 to 58 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

Rest Of Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then isolated showers after midnight. Lows 68 to 76 near the shore to 62 to 69 near 3000 feet. East winds 10 to 20 mph. Gusts up to 40 mph after midnight. Chance of rain 50 percent.

Saturday: Cloudy and breezy. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to 72 to 82 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Saturday Night: Cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 65 to 76 near the shore to 57 to 69 near 3000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.

Kohala

Rest Of Tonight: Mostly cloudy. Breezy. Scattered showers in the evening, then isolated showers after midnight. Lows 68 to 76 near the shore to 62 to 69 near 3000 feet. East winds 10 to 20 mph. Gusts up to 40 mph after midnight. Chance of rain 50 percent.

Saturday: Cloudy and breezy. Isolated showers in the morning, then scattered showers in the afternoon. Highs around 83 near the shore to 72 to 82 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Saturday Night: Cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 65 to 76 near the shore to 57 to 69 near 3000 feet. East winds 10 to 15 mph. Chance of rain 40 percent.

South Big Island

Rest Of Tonight: Partly cloudy in the evening then becoming mostly cloudy. Breezy. Isolated showers. Lows around 78 near the shore to around 62 near 5000 feet. Northeast winds 10 to 20 mph. Chance of rain 20 percent.

Saturday: Cloudy and breezy. Isolated showers in the afternoon. Highs around 87 near the shore to around 72 near 5000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Saturday Night: Mostly cloudy. Lows around 77 near the shore to around 59 near 5000 feet. East winds 10 to 15 mph.

Puna

Rest Of Tonight: Mostly cloudy with scattered showers. Lows 68 to 75 near the shore to around 60 at 4000 feet. Northwest winds 10 to 15 mph. Chance of rain 50 percent.

Saturday: Cloudy. Isolated showers in the morning, then scattered showers in the afternoon. Highs 81 to 86 near the shore to 67 to 72 at 4000 feet. Northeast winds 10 to 15 mph. Chance of rain 40 percent.

Saturday Night: Cloudy. Isolated showers in the evening, then scattered showers after midnight. Lows 67 to 73 near the shore to around 60 at 4000 feet. North winds up to 10 mph. Chance of rain 40 percent.

Waikoloa

Rest Of Tonight: Partly cloudy. Breezy. Isolated showers in the evening. Lows 73 to 78 near the shore to 58 to 63 above 4000 feet. East winds 10 to 15 mph shifting to the southeast up to 20 mph after midnight. Chance of rain 20 percent.

Saturday: Breezy. Partly sunny in the morning, then cloudy with isolated showers in the afternoon. Highs 86 to 92 near the shore to 69 to 76 above 4000 feet. Northeast winds 10 to 25 mph decreasing to up to 25 mph in the afternoon. Chance of rain 20 percent.

Saturday Night: Mostly cloudy. Isolated showers in the evening. Lows around 76 near the shore to 55 to 61 above 4000 feet. East winds up to 10 mph. Chance of rain 20 percent.

Detailed Forecast

Synopsis

A relative decrease in shower activity in the wake of a departing surface trough associated with the remnants of Norbert is expected through this weekend. Moderate to locally breezy trade winds will continue through Monday before gradually declining by midweek. Another round of enhanced moisture will arrive by next Tuesday, which should increase shower activity statewide.

Short term update

No major updates were made as the previous forecast is on track.

Prev discussion

Issued at 319 PM HST Fri Sep 18 2026
This afternoons visible satellite and radar imagery shows a limited amount of shower activity relative to the past couple of days. A surface trough associated with the remnants of Tropical Cyclone Norbert continues to move westward as it exits the vicinity of the state tonight. However, an upper level trough combined with the residual moisture from Norbert has kept the environment relatively unstable, as noted by some thunderstorms occurring offshore earlier today, and over the Kona slopes of the Big Island this afternoon.
An increasing trend in stability and relatively drier air will begin this weekend, which will limit shower activity and coverage to windward and mauka areas. Kona slopes of the Big Island may still see some afternoon showers as well through the weekend, with a small chance of thunderstorms upslope due to lingering instability. However with the low confidence, have not added thunderstorms to the forecast. Trade winds will continue to blow out of the ENE-E direction at moderate to locally breezy speeds through Monday, but are expected to gradually decline by midweek.
Another influx of moisture associated with the remnants of Tropical Depression 15-E is expected to arrive by Tuesday and potentially remain through Thursday. Precipitable water values could reach up to 2.5″ over the southeastern portion of the state according to global models, which is above seasonal normal. A shortwave is also expected to be within the vicinity of the islands during this time period, which could lead to some enhanced showers statewide.
The long term forecast will also be dependent on how models handle the remnants of Tropical Depression 15-E. The National Hurricane Center continues to monitor the situation, and suggests that environmental conditions are conducive for some development of the system next week. Given that there is plenty of time for this forecast to change, please continue to monitor the status of tropical cyclone development through nhc.noaa.gov, and local weather forecasts at weather.gov/hfo.

Aviation

A surface trough associated with the remnants of former TC Norbert will exit the region to the west tonight. As a result, a drier trade wind pattern is expected on Saturday. VFR conditions will prevail for most locations, with the potential for passing MVFR ceilings and isolated showers mainly along windward and mountain areas. The Kona slopes of the Big Island could see some afternoon showers as well on Saturday. Isolated thunderstorms cannot be completely ruled out for the Big Island again on Saturday afternoon, but confidence is too low to include in the forecast at this time. Breezy trade winds will persist through the weekend.
AIRMET Tango has been issued for moderate low-level turbulence downwind of island terrain due to the breezy trade winds. This AIRMET will likely be needed through much of the weekend.

Marine

High pressure will remain to the northeast, therefore moderate to locally strong trade winds will continue through at least the first half of next week. A Small Craft Advisory is in effect for the typical windy waters around Maui County and Big Island through Saturday, and will likely be extended into early next week for these waters. A trough could move into the area next week.
Surf along south-facing shores will remain above average through the weekend as long-period south-southwest swell peaks tonight. Then another south swell will build in Saturday and both swell will decline gradually next week. A smaller long period swell could fill in late next week.
Moderate surf along east-facing shores will persist over the next several days as fresh to locally strong trades continue. Surf along north-facing shores will remain flat to tiny, with a minor bump possible Tuesday into Wednesday next week. Then a small long period west-northwest swell swell could build in late next week.

HFO Watches/Warnings/Advisories

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

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Data Courtesy of NOAA.gov