Hilo

Rest Of Tonight: Partly cloudy with isolated showers. Haze. Lows 61 to 70 near the shore to 52 to 57 at 4000 feet. South winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Wednesday: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Haze through the day. Highs around 83 near the shore to 67 to 72 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 40 percent.

Wednesday Night: Partly cloudy with isolated showers. Haze. Lows 61 to 70 near the shore to 53 to 58 at 4000 feet. Light winds. Chance of rain 20 percent.

Kona

Rest Of Tonight: Mostly cloudy early in the evening then becoming partly cloudy. Isolated showers in the evening. Haze through the night. Lows around 72 near the shore to 49 to 54 near 5000 feet. Light winds. Chance of rain 20 percent.

Wednesday: Sunny in the morning, then partly sunny with isolated showers in the afternoon. Haze through the day. Highs 82 to 88 near the shore to around 69 near 5000 feet. West winds up to 10 mph. Chance of rain 20 percent.

Wednesday Night: Partly cloudy. Isolated showers in the evening. Haze through the night. Lows around 72 near the shore to 50 to 55 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

Rest Of Tonight: Mostly cloudy early in the evening then becoming partly cloudy. Isolated showers in the evening. Haze through the night. Lows 62 to 71 near the shore to 56 to 63 near 3000 feet. South winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Wednesday: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Haze through the day. Highs around 81 near the shore to 70 to 77 near 3000 feet. Northeast winds up to 10 mph. Chance of rain 40 percent.

Wednesday Night: Partly cloudy. Isolated showers in the evening. Haze through the night. Lows 62 to 71 near the shore to 56 to 63 near 3000 feet. Light winds. Chance of rain 20 percent.

Kohala

Rest Of Tonight: Mostly cloudy early in the evening then becoming partly cloudy. Isolated showers in the evening. Haze through the night. Lows 62 to 71 near the shore to 56 to 63 near 3000 feet. South winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Wednesday: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Haze through the day. Highs around 81 near the shore to 70 to 77 near 3000 feet. Northeast winds up to 10 mph. Chance of rain 40 percent.

Wednesday Night: Partly cloudy. Isolated showers in the evening. Haze through the night. Lows 62 to 71 near the shore to 56 to 63 near 3000 feet. Light winds. Chance of rain 20 percent.

South Big Island

Rest Of Tonight: Mostly clear. Isolated showers early in the evening. Haze through the night. Lows around 74 near the shore to around 54 near 5000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Wednesday: Sunny. Haze through the day. Isolated showers in the afternoon. Highs around 86 near the shore to around 69 near 5000 feet. Southeast winds up to 15 mph. Chance of rain 20 percent.

Wednesday Night: Mostly clear. Haze. Lows around 74 near the shore to around 55 near 5000 feet. North winds up to 10 mph.

Puna

Rest Of Tonight: Partly cloudy with isolated showers. Haze. Lows 61 to 70 near the shore to 52 to 57 at 4000 feet. South winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Wednesday: Mostly sunny. Isolated showers in the morning, then scattered showers in the afternoon. Haze through the day. Highs around 83 near the shore to 67 to 72 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 40 percent.

Wednesday Night: Partly cloudy with isolated showers. Haze. Lows 61 to 70 near the shore to 53 to 58 at 4000 feet. Light winds. Chance of rain 20 percent.

Waikoloa

Rest Of Tonight: Mostly cloudy early in the evening then becoming partly cloudy. Isolated showers in the evening. Haze through the night. Lows around 73 near the shore to 51 to 56 above 4000 feet. Light winds. Chance of rain 20 percent.

Wednesday: Sunny in the morning, then partly sunny with scattered showers in the afternoon. Haze through the day. Highs around 85 near the shore to around 69 above 4000 feet. Northwest winds up to 10 mph. Chance of rain 40 percent.

Wednesday Night: Haze in the evening. Mostly cloudy with isolated showers in the evening, then mostly clear after midnight. Lows around 73 near the shore to around 55 above 4000 feet. Light winds. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Light winds and humid conditions will persist through Wednesday as a weak trough lingers near the state. Interior clouds and a few showers will develop during the afternoon hours, followed by partial clearing overnight. Trade winds will gradually return Thursday and Friday, bringing a more typical pattern of mainly windward and mauka showers with a few afternoon showers over leeward areas. A slight increase in showers remains possible this weekend as an upper disturbance approaches the islands, followed by stronger trade winds and more stable conditions early next week.

Discussion

The humid land and sea breeze pattern with dewpoints hovering in the upper 60s will continue through Wednesday as the weak trough meanders near the central portion of the island chain. Expect partial clearing overnight, followed by another round of interior and leeward clouds and isolated to scattered showers Wednesday afternoon. Shower chances may remain slightly enhanced near central islands where the trough is located.
Kilauea eruption episode 46 ended a few hours ago, and the Ashfall Advisory for portions of the Big Island has ended.
Light to moderate trade winds will gradually return Thursday and Friday as the subtropical ridge rebuilds north of the state. Showers will become more focused over windward and mauka areas, though localized afternoon sea breeze clouds and a few showers may still develop over sheltered leeward terrain. Dewpoints are expected to ease back into the mid 60s later this week, bringing some relief from the recent humidity.
By the weekend, an upper-level disturbance approaching the region could lead to a slight increase in showers, though uncertainty remains elevated due to model differences regarding the timing and strength of these features. More stable conditions and stronger trade winds are expected to return early next week.

Aviation

A light background wind prevails with land breezes expected overnight into Wednesday morning. Expect VFR conditions as cloud and shower coverage clear throughout the overnight period. Light winds are expected through midweek.
No AIRMETs are in effect.

Marine

A trough over the far northwest offshore waters will slowly track south through the islands, reaching the central waters Wednesday. This, combined with a larger synoptic scale low pressure system far to the north will lead to light and variable winds, with sea and land breezes present near the immediate coasts. The subtropical ridge building north of the state will bring a return of light to moderate trades Thursday and Friday, with the trades strengthening to moderate and fresh levels over the weekend. Winds and seas are expected to remain below Small Craft Advisory thresholds through at least Friday.
A moderate medium-period northwest swell will gradually fade over the next couple of days. A new long period swell originating from a gale force low south of Kamchatka will build Wednesday night and give another boost to north and west shore surf Thursday and Friday. Surf will gradually decline over the weekend into early next week.
A series of overlapping south swells will keep intermittent small surf rolling into south facing shores. A small, long-period swell arriving Wednesday from a storm-force low that tracked southeast of New Zealand last week will likely provide a small bump in south shore surf through the end of the week.
Surf along east facing shores will remain below normal during the next several days due to the lack of strong trades over and upstream of the islands.

HFO Watches/Warnings/Advisories

Ashfall Advisory until 8 PM HST this evening for Big Island Southeast, Big Island East.

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Data Courtesy of NOAA.gov