Hilo

Tonight: Partly sunny early in the evening then becoming partly cloudy. Isolated showers in the evening. Lows 60 to 70 near the shore to 51 to 57 at 4000 feet. South winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Monday: Mostly sunny in the morning then becoming cloudy. Highs around 82 near the shore to around 68 at 4000 feet. South winds up to 15 mph.

Monday Night: Cloudy. Isolated showers after midnight. Lows 62 to 71 near the shore to 52 to 58 at 4000 feet. South winds up to 10 mph. Chance of rain 20 percent.

Kona

Tonight: Partly sunny early in the evening then becoming partly cloudy. Isolated showers in the evening. Lows 68 to 74 near the shore to around 50 near 5000 feet. South winds up to 10 mph early in the evening becoming light. Chance of rain 20 percent.

Monday: Mostly sunny in the morning then becoming cloudy. Highs 82 to 87 near the shore to around 68 near 5000 feet. Northwest winds up to 10 mph.

Monday Night: Cloudy. Lows 69 to 75 near the shore to around 52 near 5000 feet. Light winds.

Waimea

Tonight: Mostly cloudy with isolated showers in the evening, then partly cloudy after midnight. Lows 62 to 70 near the shore to 54 to 61 near 3000 feet. Light winds. Chance of rain 20 percent.

Monday: Mostly sunny in the morning, then cloudy with isolated showers in the afternoon. Highs around 79 near the shore to 70 to 77 near 3000 feet. North winds up to 10 mph shifting to the northeast in the afternoon. Chance of rain 20 percent.

Monday Night: Cloudy. Lows 62 to 71 near the shore to 55 to 62 near 3000 feet. Light winds.

Kohala

Tonight: Mostly cloudy with isolated showers in the evening, then partly cloudy after midnight. Lows 62 to 70 near the shore to 54 to 61 near 3000 feet. Light winds. Chance of rain 20 percent.

Monday: Mostly sunny in the morning, then cloudy with isolated showers in the afternoon. Highs around 79 near the shore to 70 to 77 near 3000 feet. North winds up to 10 mph shifting to the northeast in the afternoon. Chance of rain 20 percent.

Monday Night: Cloudy. Lows 62 to 71 near the shore to 55 to 62 near 3000 feet. Light winds.

South Big Island

Tonight: Partly sunny early in the evening then becoming partly cloudy. Isolated showers. Lows around 73 near the shore to around 53 near 5000 feet. East winds 10 to 15 mph decreasing to up to 15 mph. Chance of rain 20 percent.

Monday: Breezy. Mostly sunny with isolated showers in the morning, then cloudy in the afternoon. Highs around 84 near the shore to around 67 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Monday Night: Cloudy. Lows around 74 near the shore to around 54 near 5000 feet. East winds 10 to 15 mph.

Puna

Tonight: Partly sunny early in the evening then becoming partly cloudy. Isolated showers in the evening. Lows 60 to 70 near the shore to 51 to 57 at 4000 feet. South winds up to 10 mph in the evening becoming light. Chance of rain 20 percent.

Monday: Mostly sunny in the morning then becoming cloudy. Highs around 82 near the shore to around 68 at 4000 feet. South winds up to 15 mph.

Monday Night: Cloudy. Isolated showers after midnight. Lows 62 to 71 near the shore to 52 to 58 at 4000 feet. South winds up to 10 mph. Chance of rain 20 percent.

Waikoloa

Tonight: Partly sunny early in the evening then becoming partly cloudy. Scattered showers early in the evening, then isolated showers in the evening. Lows around 72 near the shore to 50 to 55 above 4000 feet. Northwest winds up to 10 mph early in the evening becoming light. Chance of rain 30 percent.

Monday: Mostly sunny in the morning then becoming cloudy. Highs around 84 near the shore to 65 to 71 above 4000 feet. Northwest winds up to 10 mph.

Monday Night: Cloudy. Lows around 73 near the shore to 51 to 56 above 4000 feet. Light winds.

Detailed Forecast

Update

06Z Aviation Discussion.

Prev discussion

/ISSUED 244 PM HST Sun Dec 14 2025/
.SYNOPSIS… A front that has stalled out in the vicinity of Oahu will hold its position through the afternoon before moving slowly back to the north and west tonight and Monday. This will bring continued chances for moderate to heavy rain to the western end of the state through tomorrow. The chance of rain decreases Monday night into Tuesday, but returns Tuesday night into Wednesday as the remains of the current front fuse with a new one and they move back into the western part of the state. Confidence in location is not as high with this next system, as guidance has trended away from bringing it as far east as Oahu.

Discussion

Radar and satellite have shown repeated episodes of moderate to heavy rain moving over Oahu this afternoon, with lesser amounts over western Molokai and eastern Kauai. Rainfall amounts of 2 to just over 3 inches were recorded in the past 24 hours on Kauai, with over an inch in just the past 3 hours in several locations on Oahu. Moderate to heavy rainfall is likely over much of Oahu for the remainder of the afternoon and into tonight. A flood watch for flash flooding remains in effect for Niihau/Kauai/Oahu through late Monday night.
This first weakening front will recede westward tonight and Monday as a new front rapidly approaches from the northwest. The new front will combine with the remains of this current system and approach Kauai/Niihau Tuesday night. Latest model consensus is that this next front will not make it as far east (to/past Oahu) as the current one. It is too early to be sure, however. Folks from Oahu westward should remain alert to the possibility of another moderate/heavy rain event with potential flooding Wednesday through Thursday night.
Moisture is forecast to linger of the state with light winds later in the week and into next weekend. This could allow for yet additional showers and warm humid conditions.

Aviation

A trough in the vicinity of the western islands of Kauai and Oahu will meander through Monday. Moisture riding up from the southwest along the trough will create periodic IFR/MVFR cigs and vsbys within heavier showers. Lingering instability will keep a mention of heightened chances for isolated thunderstorms. Winds along or in the wake of the trough are variable. Light winds will tend to be more southerly downstream of the boundary. Expect statewide southerlies Monday night into Tuesday morning as the trough completely washes.
AIRMET Sierra in effect for mtn obsc for Kauai and Oahu and for IFR conditions.

Marine

Winds have weakened behind a front that is presently positioned in the vicinity of Oahu. Winds become locally fresh out of the south late tonight through mid-week as another front approaches from the west. Gentle to locally moderate S to SSW winds are then forecast for the remainder of the forecast period. The Small Craft Advisory for elevated seas remains in effect for western waters.
Incoming large, medium period WNW (290-300) swell registered higher than anticipated at offshore NDBC Buoys 51101 and 51001 this afternoon prompting an upward revision to surf values for N and W facing shores of Kauai and Oahu and N facing shores of Maui as swell rapidly builds this evening. It is not out of the question that surf briefly touches the High Surf Warning threshold as it peaks overnight but uncertainty and borderline nature precludes an upgrade to a warning at this time. The surf forecast was likewise revised upward for W facing shores of Leeward Big Island where the 290-300 degree trajectory is favorable for building surf there by Monday morning. A High Surf Warning has been issued for these zones. A combination of moderate northwest and north swells will keep surf elevated through the week.
E facing shores remain tiny to small given the lack of trade winds but shorelines exposed to N swell energy may remain slightly elevated through Wednesday. Surf along S shores increases due to short period wind wave chop, mainly over the western islands associated with the passing front.

Fire weather

Weather conditions will remain below critical fire weather thresholds through the forecast period. Unsettled light to moderate southerly winds are forecast for the western half of the state, while more stable and drier easterly winds will continue over Maui and the Big Island. Temperature inversion heights near Maui and the Big Island will range from 7,000 to 8,000 feet today.

HFO Watches/Warnings/Advisories

Flood Watch through late Monday night for Niihau, Kauai Leeward, Kauai Mountains, Waianae Coast, Oahu North Shore, Olomana, Central Oahu, Waianae Mountains, Kauai North, Kauai East, Kauai South, East Honolulu, Honolulu Metro, Ewa Plain, Koolau Windward, Koolau Leeward.
High Surf Advisory until 6 PM HST Monday for Niihau, Kauai Leeward, Waianae Coast, Oahu North Shore, Maui Windward West, Kauai North, Molokai Windward, Molokai North, Molokai West, Maui Central Valley North, Windward Haleakala.
High Surf Warning from 6 AM Monday to 6 AM HST Tuesday for Kona, Kohala.
Small Craft Advisory until 6 PM HST Monday for Kauai Northwest Waters, Kauai Windward Waters, Kauai Leeward Waters, Kauai Channel, Oahu Windward Waters.

Data Courtesy of NOAA.gov