Weather Forecast

Hawaii County Weather Forecast for August 20, 2022

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Photo Credit: James Grenz

Hilo

Today: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 85 near the shore to 70 to 75 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows around 68 near the shore to around 54 at 4000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Sunday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs around 85 near the shore to 70 to 75 at 4000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Kona

Today: Sunny in the morning, then mostly cloudy with isolated showers in the afternoon. Highs 83 to 88 near the shore to around 70 near 5000 feet. Southwest winds up to 10 mph shifting to the northwest in the afternoon. Chance of rain 20 percent.

Tonight: Mostly cloudy in the evening then becoming partly cloudy. Isolated showers. Lows 69 to 75 near the shore to around 55 near 5000 feet. Light winds. Chance of rain 20 percent.

ARTICLE CONTINUES BELOW AD
ARTICLE CONTINUES BELOW AD

Sunday: Sunny in the morning, then mostly cloudy with isolated showers in the afternoon. Highs 83 to 88 near the shore to around 70 near 5000 feet. Southwest winds up to 10 mph. Chance of rain 20 percent.

Waimea

Today: Breezy. Mostly sunny with isolated showers. Highs around 83 near the shore to 70 to 80 near 3000 feet. East winds up to 20 mph shifting to the northeast 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 68 near the shore to 56 to 62 near 3000 feet. East winds 10 to 20 mph. Chance of rain 40 percent.

Sunday: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 83 near the shore to 70 to 80 near 3000 feet. East winds 10 to 20 mph. Chance of rain 40 percent.

Kohala

Today: Breezy. Mostly sunny with isolated showers. Highs around 83 near the shore to 70 to 80 near 3000 feet. East winds up to 20 mph shifting to the northeast 10 to 20 mph in the afternoon. Chance of rain 20 percent.

ARTICLE CONTINUES BELOW AD

Tonight: Partly cloudy. Breezy. Isolated showers in the evening, then scattered showers after midnight. Lows around 68 near the shore to 56 to 62 near 3000 feet. East winds 10 to 20 mph. Chance of rain 40 percent.

Sunday: Mostly sunny. Breezy. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 83 near the shore to 70 to 80 near 3000 feet. East winds 10 to 20 mph. Chance of rain 40 percent.

South Big Island

Today: Breezy. Sunny in the morning, then partly sunny with isolated showers in the afternoon. Highs around 87 near the shore to around 74 near 5000 feet. East winds up to 20 mph. Chance of rain 20 percent.

Tonight: Partly cloudy. Isolated showers in the evening. Lows around 70 near the shore to around 53 near 5000 feet. Northeast winds up to 15 mph. Chance of rain 20 percent.

Sunday: Sunny in the morning, then mostly cloudy with isolated showers in the afternoon. Highs around 87 near the shore to around 74 near 5000 feet. East winds up to 15 mph. Chance of rain 20 percent.

Puna

ARTICLE CONTINUES BELOW AD

Today: Mostly sunny. Scattered showers in the morning, then isolated showers in the afternoon. Highs around 85 near the shore to 70 to 75 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 50 percent.

Tonight: Partly cloudy in the evening then becoming mostly cloudy. Scattered showers. Lows around 68 near the shore to around 54 at 4000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Sunday: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs around 85 near the shore to 70 to 75 at 4000 feet. North winds up to 15 mph. Chance of rain 50 percent.

Waikoloa

Today: Sunny and breezy. Highs around 87 near the shore to 71 to 77 above 4000 feet. Northeast winds up to 20 mph.

Tonight: Mostly clear. Lows 70 to 75 near the shore to 51 to 58 above 4000 feet. East winds up to 15 mph.

Sunday: Sunny and breezy. Highs around 87 near the shore to 71 to 77 above 4000 feet. Northeast winds up to 25 mph.

Detailed Forecast

Synopsis

Stable trade wind weather will prevail through the weekend, focusing modest rainfall over windward areas and producing a few showers across the Kona slopes of the Big Island each afternoon. Trade winds will ease early next week as a weak disturbance brings an increase in shower activity.

Discussion

There is little to no change in forecast philosophy from last evening. A ridge north of the islands will keep moderate to breezy trade winds blowing across local waters and upper ridging will provide stable airmass conditions. Expect modest rainfall at most windward sites. Aside from a few afternoon showers over the Kona slopes of the Big Island, leeward areas will be dry. Dew points will remain in the mid to upper 60s leeward and around 70 windward, which will bring more comfortable conditions compared to the past few days.
Trade winds will ease Monday into Wednesday as the ridge to the north weakens. Weak upper troughing, east of the state this morning, will pass over the islands during this time, bringing a rise in humidity and a potential increase in showers. Trade winds will likely become weak enough for daytime sea breezes to take over, leading to higher rain chances over leeward and interior areas each afternoon. Trades may build back on Thursday.

Aviation

A weak high pressure ridge north of the Hawaiian Islands will keep moderate to locally breezy trade winds in place. VFR conditions will prevail over the next 24 hours. A weak low level trough approaching the islands from the east will bring a slight increase in windward and mountain cloud and shower coverage over eastern islands this morning with brief periods of MVFR conditions in showers. Otherwise strong atmospheric stability across the region will keep only brief passing showers in the forecast affecting windward airfields. Drier conditions are forecast over leeward areas.
AIRMET Tango remains in effect for moderate low level turbulence below 8000 feet over and immediately south through west of mountains.

Marine

Northeast-to-southwest orientated surface high pressure centered about 800 nm northeast of Oahu is maintaining a tight enough pressure gradient back towards the islands to support continued moderate to locally strong trade winds through the weekend. A Small Craft Advisory is in effect for the typically windier waters around Maui County and Big Island through 6 PM Sunday. A front northwest of the high moving southeastward will subtly weaken ridging and will result in easing trades early next week.
Based upon the latest south swell moving through Samoa at mid week, long period energy from this swell should begin arriving in our far offshore waters through the day. South swell should begin building surf along the south facing shores from this afternoon, peak surf to just below surf advisory levels Sunday through Monday then gradually lower through the middle of next week. Short period, choppy wind wave surf will hold steady through the weekend along eastern facing shores, then lower slightly early next week as trades weaken. Surf along north facing shores will remain just above flat through the weekend. A small, medium period northwest swell is forecast to move through during the first half of next week. This should provide a small boost to north shore surf.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6 PM HST Sunday for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.

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Data Courtesy of NOAA.gov

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