Hilo

Rest Of Tonight: Mostly cloudy. Numerous showers in the evening, then showers after midnight. Lows 65 to 72 near the shore to around 57 at 4000 feet. North winds up to 15 mph. Chance of rain 80 percent.

Monday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 78 to 85 near the shore to around 65 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 70 percent.

Monday Night: Mostly cloudy. Numerous showers in the evening, then showers after midnight. Lows 64 to 71 near the shore to 54 to 59 at 4000 feet. North winds up to 15 mph. Chance of rain 80 percent.

Kona

Rest Of Tonight: Partly cloudy with isolated showers. Lows 67 to 75 near the shore to around 54 near 5000 feet. Light winds. Chance of rain 20 percent.

Monday: Mostly sunny. Scattered showers in the afternoon. Highs 83 to 88 near the shore to around 66 near 5000 feet. Light winds. Chance of rain 40 percent.

Monday Night: Partly cloudy with isolated showers. Lows 70 to 76 near the shore to 47 to 55 near 5000 feet. Light winds. Chance of rain 20 percent.

Waimea

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 65 to 72 near the shore to 58 to 65 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Monday: Breezy. Partly sunny with scattered showers. Highs around 80 near the shore to 66 to 78 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 63 to 72 near the shore to 56 to 65 near 3000 feet. East winds 10 to 15 mph decreasing to up to 15 mph after midnight. Chance of rain 50 percent.

Kohala

Rest Of Tonight: Breezy. Mostly cloudy with scattered showers. Lows 65 to 72 near the shore to 58 to 65 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Monday: Breezy. Partly sunny with scattered showers. Highs around 80 near the shore to 66 to 78 near 3000 feet. East winds 10 to 25 mph. Chance of rain 50 percent.

Monday Night: Mostly cloudy with scattered showers. Lows 63 to 72 near the shore to 56 to 65 near 3000 feet. East winds 10 to 15 mph decreasing to up to 15 mph after midnight. Chance of rain 50 percent.

South Big Island

Rest Of Tonight: Mostly clear. Breezy. Isolated showers in the evening. Lows around 76 near the shore to around 58 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Monday: Sunny and breezy. Isolated showers in the afternoon. Highs around 86 near the shore to around 65 near 5000 feet. East winds up to 25 mph. Chance of rain 20 percent.

Monday Night: Mostly clear. Isolated showers in the evening. Lows around 74 near the shore to around 57 near 5000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Puna

Rest Of Tonight: Mostly cloudy. Numerous showers in the evening, then showers after midnight. Lows 65 to 72 near the shore to around 57 at 4000 feet. North winds up to 15 mph. Chance of rain 80 percent.

Monday: Mostly cloudy. Numerous showers in the morning, then scattered showers in the afternoon. Highs 78 to 85 near the shore to around 65 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 70 percent.

Monday Night: Mostly cloudy. Numerous showers in the evening, then showers after midnight. Lows 64 to 71 near the shore to 54 to 59 at 4000 feet. North winds up to 15 mph. Chance of rain 80 percent.

Waikoloa

Rest Of Tonight: Mostly clear. Breezy. Isolated showers in the evening. Lows 69 to 75 near the shore to 52 to 58 above 4000 feet. East winds up to 25 mph with gusts to 45 mph. Chance of rain 20 percent.

Monday: Sunny and breezy. Highs 84 to 89 near the shore to 65 to 71 above 4000 feet. Northeast winds up to 25 mph with gusts to 45 mph.

Monday Night: Mostly clear. Isolated showers in the evening. Lows around 75 near the shore to 52 to 58 above 4000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Detailed Forecast

Synopsis

Moderate to locally breezy trade winds will persist through Monday as high pressure remains north of the state, with weaker trades Tuesday through at least Friday. Windward and mauka showers will continue, with a slight uptick in moisture likely Tuesday into Tuesday night, and possibly from Friday into next weekend.

Short term update

Minor adjustments were made to PoPs to account for current trends, otherwise previous forecast remains on track.

Prev discussion

Issued at 333 PM HST Sun Jul 12 2026
Radar showed numerous showers across the islands today, mainly windward and mauka, but not leaving the lee side out completely. Rainfall amounts in the past 6 hours ranged up to a half inch on windward and mauka areas on most islands, and up to three-quarters of an inch on the Big Island. Skies were partly to mostly cloudy in most areas. Winds were a little stronger than Saturday, averaging 12 to 25 mph, with gusts over 40 mph in the windier locations.
As a strong surface high pressure system remains nearly stationary to our north, we will be kept in east to northeast trade winds through the coming week. Winds will weaken slightly Monday, and then a little more Tuesday, then remain around that level for several days. An area of increased moisture, and therefore showers, is still on schedule to arrive Tuesday through Tuesday night, with drier air moving in for Wednesday and Thursday. Details remain to be worked out beyond Thursday, but there are indications of additional moisture moving back in Friday and potentially lasting into next Sunday.

Aviation

Breezy trade winds will continue, bringing intermittent shower activity across the islands through the period. Intermittent MVFR is possible under showers, otherwise VFR is generally expected.
AIRMET Sierra is in effect for windward Kauai. This is expected to remain in effect through the overnight hours, and may potentially expand to other islands depending on how shower activity develops overnight.
AIRMET Tango also remains in effect for low-level turbulence downwind of terrain, and is expected to continue for the next several days as we remain under a breezy trade wind pattern.

Marine

Strong high pressure north of the islands will keep fresh to strong trades blowing tonight, before easing Monday through Tuesday as the high lifts northeast and weakens. A Small Craft Advisory (SCA) is in effect for all waters through 6 PM Monday. The SCA may be scaled back some on Monday, further reduced in areal coverage on Monday night, and will likely not be needed for any waters by Tuesday. The lighter trades should continue through Wednesday night, then may increase a bit Thursday and Friday as high pressure northeast of the islands drops a bit further south and tightens up the local pressure gradient.
A small, long-period southwest swell will continue to fill in tonight, peak on Monday, then gradually decline through the middle of the week. Surf along east-facing shores will remain rough and choppy through Monday, then steadily decline through the middle of the week. A series of overlapping small south and southwest swells will then give a small boost to the surf along south facing shores Thursday through next weekend, with perhaps a more sizable south swell moving in early next week.
A series of small, low to medium period west to west-northwest swells generated by former Super Typhoon Bavi will be possible throughout the week. Otherwise, no significant north or northwest swells are expected, so surf along north-facing shores is expected to remain flat to tiny.
Peak monthly high tides combined with water levels that are running slightly higher than predicted will lead to minor flooding along the shoreline and in low-lying coastal areas. Coastal flooding is possible around the daily peak tide, which will be during the afternoon hours. A Coastal Flood Statement remains in effect through Tuesday afternoon.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Monday for Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters, Big Island Windward Waters, Kaiwi Channel, Kauai Channel, Kauai Leeward Waters, Kauai Northwest Waters, Kauai Windward Waters, Maalaea Bay, Maui County Leeward Waters, Maui County Windward Waters, Oahu Leeward Waters, Oahu Windward Waters, Pailolo Channel.

Big Island Now Weather is brought to you by Blue Hawaiian Helicopters.

Check out their Big Island Helicopter Tours today!

Data Courtesy of NOAA.gov