Hilo

Rest Of Tonight: Mostly cloudy. Slight chance of showers early in the evening, then chance of showers after midnight. Lows 61 to 70 near the shore to 53 to 59 at 4000 feet. Northwest winds up to 10 mph. Chance of rain 30 percent.

Sunday: Mostly cloudy with a 50 percent chance of showers. Highs around 80 near the shore to around 68 at 4000 feet. Northeast winds up to 15 mph shifting to the east in the afternoon.

Sunday Night: Mostly cloudy. Slight chance of showers in the evening, then chance of showers after midnight. Lows 61 to 70 near the shore to 53 to 58 at 4000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.

Kona

Rest Of Tonight: Mostly cloudy. A 20 percent chance of showers early in the evening. Lows around 72 near the shore to 51 to 56 near 5000 feet. Light winds.

Sunday: Mostly cloudy. Slight chance of showers in the morning, then chance of showers and slight chance of thunderstorms in the afternoon. Highs around 84 near the shore to around 69 near 5000 feet. West winds up to 10 mph. Chance of rain 40 percent.

Sunday Night: Mostly cloudy. Chance of showers in the evening, then slight chance of showers after midnight. Lows around 72 near the shore to 51 to 56 near 5000 feet. Light winds. Chance of rain 40 percent.

Waimea

Rest Of Tonight: Mostly cloudy with a 20 percent chance of showers. Lows 62 to 71 near the shore to 54 to 62 near 3000 feet. East winds up to 15 mph.

Sunday: Mostly cloudy. Slight chance of showers in the morning, then slight chance of showers and thunderstorms in the afternoon. Highs around 79 near the shore to 70 to 77 near 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Sunday Night: Mostly cloudy with a 20 percent chance of showers. Lows 63 to 71 near the shore to 55 to 63 near 3000 feet. East winds up to 15 mph.

Kohala

Rest Of Tonight: Mostly cloudy with a 20 percent chance of showers. Lows 62 to 71 near the shore to 54 to 62 near 3000 feet. East winds up to 15 mph.

Sunday: Mostly cloudy. Slight chance of showers in the morning, then slight chance of showers and thunderstorms in the afternoon. Highs around 79 near the shore to 70 to 77 near 3000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Sunday Night: Mostly cloudy with a 20 percent chance of showers. Lows 63 to 71 near the shore to 55 to 63 near 3000 feet. East winds up to 15 mph.

South Big Island

Rest Of Tonight: Mostly cloudy. A 20 percent chance of showers early in the evening. Lows around 74 near the shore to around 57 near 5000 feet. East winds up to 15 mph.

Sunday: Mostly cloudy. Breezy. A 20 percent chance of showers and thunderstorms in the afternoon. Highs around 84 near the shore to around 67 near 5000 feet. East winds up to 20 mph.

Sunday Night: Mostly cloudy. A 20 percent chance of showers in the evening. Lows around 74 near the shore to around 56 near 5000 feet. Northeast winds up to 15 mph.

Puna

Rest Of Tonight: Mostly cloudy. Slight chance of showers early in the evening, then chance of showers after midnight. Lows 61 to 70 near the shore to 53 to 59 at 4000 feet. Northwest winds up to 10 mph. Chance of rain 30 percent.

Sunday: Mostly cloudy with a 50 percent chance of showers. Highs around 80 near the shore to around 68 at 4000 feet. Northeast winds up to 15 mph shifting to the east in the afternoon.

Sunday Night: Mostly cloudy. Slight chance of showers in the evening, then chance of showers after midnight. Lows 61 to 70 near the shore to 53 to 58 at 4000 feet. Northeast winds up to 10 mph in the evening becoming light. Chance of rain 50 percent.

Waikoloa

Rest Of Tonight: Mostly cloudy. A 20 percent chance of showers early in the evening. Lows around 73 near the shore to around 55 above 4000 feet. East winds up to 15 mph.

Sunday: Mostly cloudy. Slight chance of showers in the morning, then chance of showers and slight chance of thunderstorms in the afternoon. Highs around 84 near the shore to 65 to 72 above 4000 feet. Northeast winds up to 15 mph shifting to the northwest in the afternoon. Chance of rain 40 percent.

Sunday Night: Mostly cloudy. A 20 percent chance of showers in the evening. Lows around 73 near the shore to around 55 above 4000 feet. East winds up to 10 mph in the evening becoming light.

Detailed Forecast

Synopsis

Moderate trade winds will weaken and veer out of the east- southeast across the western half of the island chain tonight as low pressure deepens several hundred miles northwest of Kauai. Shower activity should be low and focused mainly over windward areas as high clouds briefly diminish. An upper-level trough will will bring increased high clouds and renewed chances for isolated heavy showers and thunderstorms Sunday afternoon and Monday. Light winds favor chances for mainly afternoon showers Tuesday and Wednesday, followed by rebuilding trade winds Thursday and Friday.

Short term update

Issued at 856 PM HST Sat Apr 18 2026
No changes made, previous forecast is on track.

Aviation

Light to moderate easterly trades among some land-sea breezes will remain in place through the weekend under high pressure well north of the Hawaiian Islands with a surface trough lingering to the west. Overall, expect VFR conditions to prevail across most terminals through the period.
No AIRMETs in effect.

Marine

A high pressure system far north of the state will slowly drift eastward this weekend. Easterly trade winds diminish tonight as a trough to the northwest of the islands develops into a weak low pressure system by Sunday. The resulting weakness in the ridge causes winds to veer southeasterly and diminish over the western Hawaii region from Sunday into early next week. Late next week, east to northeasterly trade winds begin to redevelop with weak ridging re-establishing north of the islands.
A small pulse of medium period swell energy from the northwest should produce a slight bump in north facing surf heights tonight into Sunday morning. A small to moderate, medium period northwest swell will move into the region by Monday night and continue through Wednesday. A moderate, medium period northeast swell arrives Tuesday and peaks on Wednesday, bringing moderate surf to north-facing shores, before slowly declining through the end of the week.
A medium-period south swell will continue to fade tonight, allowing surf along south shores to return to background levels by Sunday. A series of overlapping small south swells will move into the region into next week. Surf heights along east-facing shores remain on the smaller side due to weaker trade winds until the arrival of the aforementioned northeast swell on Tuesday. Small background energy from the west will be possible, especially later in the week, from Severe Tropical Storm Sinlaku.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov