Hilo

Tonight: Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of showers. Lows 61 to 69 near the shore to 48 to 54 at 4000 feet. Light winds.

Sunday: Mostly sunny. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. East winds up to 10 mph in the morning becoming light. Chance of rain 40 percent.

Sunday Night: Partly cloudy with a 20 percent chance of showers. Lows 60 to 69 near the shore to 51 to 57 at 4000 feet. Light winds becoming northwest up to 10 mph after midnight.

Kona

Tonight: Mostly cloudy with a 20 percent chance of showers in the evening, then mostly clear after midnight. Lows around 70 near the shore to 43 to 48 near 5000 feet. Light winds.

Sunday: Sunny. A 20 percent chance of showers in the afternoon. Highs 80 to 85 near the shore to around 67 near 5000 feet. Light winds.

Sunday Night: Mostly clear. Lows around 70 near the shore to 45 to 51 near 5000 feet. Light winds.

Waimea

Tonight: Mostly clear with a 20 percent chance of showers. Lows 62 to 70 near the shore to 50 to 58 near 3000 feet. Light winds.

Sunday: Sunny. A 20 percent chance of showers in the afternoon. Highs around 77 near the shore to 67 to 76 near 3000 feet. Light winds.

Sunday Night: Mostly clear. Lows 60 to 69 near the shore to 52 to 59 near 3000 feet. Light winds.

Kohala

Tonight: Mostly clear with a 20 percent chance of showers. Lows 62 to 70 near the shore to 50 to 58 near 3000 feet. Light winds.

Sunday: Sunny. A 20 percent chance of showers in the afternoon. Highs around 77 near the shore to 67 to 76 near 3000 feet. Light winds.

Sunday Night: Mostly clear. Lows 60 to 69 near the shore to 52 to 59 near 3000 feet. Light winds.

South Big Island

Tonight: Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of showers. Lows around 70 near the shore to around 47 near 5000 feet. Light winds.

Sunday: Sunny in the morning then becoming partly sunny. A 20 percent chance of showers. Highs around 81 near the shore to around 64 near 5000 feet. Light winds.

Sunday Night: Mostly clear. Lows around 71 near the shore to around 50 near 5000 feet. Light winds.

Puna

Tonight: Mostly cloudy in the evening then becoming partly cloudy. A 20 percent chance of showers. Lows 61 to 69 near the shore to 48 to 54 at 4000 feet. Light winds.

Sunday: Mostly sunny. Slight chance of showers in the morning, then chance of showers in the afternoon. Highs 76 to 82 near the shore to 63 to 69 at 4000 feet. East winds up to 10 mph in the morning becoming light. Chance of rain 40 percent.

Sunday Night: Partly cloudy with a 20 percent chance of showers. Lows 60 to 69 near the shore to 51 to 57 at 4000 feet. Light winds becoming northwest up to 10 mph after midnight.

Waikoloa

Tonight: Mostly clear. Lows around 69 near the shore to around 48 above 4000 feet. Light winds.

Sunday: Sunny. Highs 81 to 86 near the shore to 63 to 70 above 4000 feet. Light winds.

Sunday Night: Mostly clear. Lows around 71 near the shore to around 51 above 4000 feet. Light winds.

Detailed Forecast

Synopsis

Light winds and mostly dry weather will generally prevail, but a weak front moving over the area will bring a chance of showers Sunday afternoon through Monday, mainly to windward portions of Kauai and Oahu. A brief period of moderate trade winds is possible around the middle of the week, with winds potentially diminishing by the end of the week.

Discussion

Light winds and mostly dry weather will prevail this coming week, with a couple of exceptions. A weak front moving over the islands from the N will bring a chance of showers from Sunday afternoon through Monday, mainly to N and E facing slopes and coasts of Kauai and Oahu, with a return to mostly dry weather thereafter. Except for an increase in trade wind speeds around the middle of the week, a nearby surface ridge will keep winds on the lighter side.
After another 24 hours of light and variable winds and essentially zero rainfall, a relatively weak high building NW of the area will push a weak frontal boundary over the islands. This front will bring an increase in low-level moisture that will likely fuel some light showers. The high and associated nearby ridge will support light N to NE winds as the front gradually dissipates through Tuesday, with land and sea breezes in sheltered areas on land. High clouds streaming over the area from the W should shift S, then diminish over the next 24 to 48 hours.
Strengthening ENE trade winds may briefly reach moderate levels around mid-week when the high moves to a position NE of the islands. Although confidence is low, trade winds may diminish again by the end of the week as a low passes N of the islands. Limited (windward) to no (leeward) rainfall is expected after the front dissipates.

Aviation

Light winds with sea/land breezes are expected through Sunday. Some isolated MVFR cigs and light showers will remain possible over windward Big Island through early this evening. A weak front may bring some MVFR cigs/vsbys to Kauai Sunday afternoon.
No AIRMETs are currently in effect. AIRMET Tango will likely be required for moderate upper level turbulence around 30 kft tonight.

Marine

A weak front will approach from the northwest tonight, then move into the far western waters Sunday afternoon. The front will then shift slowly southeast down the island chain Sunday night and Monday before dissipating around Maui or the Big Island by Tuesday. Winds will remain light and variable during this time with land and sea breezes developing near the island coastlines. A weak area of high pressure will build in north of the islands around the middle of next week, bringing a return of light to moderate trade winds.
A new, medium-period NW swell will build tonight and peak Sunday, with peak surf heights bringing high surf to many north and west facing shores, then diminish Monday. In addition, a fresh pulse of moderate-sized long-period NNE swell will peak tonight, then gradually diminish over the next several days. Moderate-sized northwest swell will persist for most of the upcoming week. A large long-period NW swell is expected Friday and Saturday, with peak surf heights approaching High Surf Warning levels. No other significant swells are expected.

Fire weather

KBDI values remain elevated across leeward areas, and no significant leeward rainfall is anticipated for at least the next several days. Relative humidity values may approach the critical 45% threshold during the late morning and afternoon hours as a relatively dry air mass remains in place. However, light winds will prevent critical fire weather conditions from developing.

HFO Watches/Warnings/Advisories

High Surf Advisory from 4 AM Sunday to 6 AM HST Monday for North and West facing shores of Niihau Kauai Oahu Molokai and for North facing shores of Maui.

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Data Courtesy of NOAA.gov