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Hawaii County weather forecast for May 1, 2024: Big Island now

Photo credit: James Grenz

Hilo

Today: Partly sunny with a few showers. Highs range from 77 to 82 near the coast and around 65 at 4,000 feet. East winds up to 10 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Tonight: Mostly cloudy. Scattered showers in the evening, likely showers after midnight. Lows 62 to 68 near shore to 51 to 56 at 4,000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Thursday: In the morning it will be cloudy with a chance of showers, in the afternoon it will be partly sunny with a few showers. Highs range from 77 to 82 near the coast and around 65 at 4,000 feet. East winds up to 15 mph, increasing to 6 to 15 mph in the afternoon. Chance of rain 70 percent.

Kona

Today: In the morning it will be mostly sunny, then it will become mostly cloudy. Isolated showers. Highs range from about 84 near the coast to about 66 near 5,000 feet. Westerly winds gusting up to 10 miles per hour. Chance of rain 20 percent.

Tonight: Mostly cloudy with a few showers in the evening, then partly cloudy with a few showers after midnight. Lows range from around 71 near the coast to 48 to 53 near 5,000 feet. Breeze. Chance of rain 40 percent.

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Thursday: Mostly sunny with a few showers in the morning, then partly sunny with a few showers in the afternoon. Highs from 81 to 86 near the coast to about 66 near 5,000 feet. Breeze. Chance of rain 40 percent.

Waimea

Today: Mostly sunny in the morning, then partly sunny. Airy. Isolated showers. Highs: 63 to 82. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Tonight: Mostly cloudy with a few showers. Lows 61 to 69 near shore to 53 to 60 near 3,000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Thursday: Airy. Partly sunny with a few showers. Highs range from about 77 near the coast to 65 to 76 near 3,000 feet. East winds 10 to 20 mph. Chance of rain 50 percent.

Kohala

Today: Mostly sunny in the morning, then partly sunny. Airy. Isolated showers. Highs: 63 to 82. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 20 percent.

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Tonight: Mostly cloudy with a few showers. Lows 61 to 69 near shore to 53 to 60 near 3,000 feet. East winds 10 to 15 mph. Chance of rain 50 percent.

Thursday: Airy. Partly sunny with a few showers. Highs range from about 77 near the coast to 65 to 76 near 3,000 feet. East winds 10 to 20 mph. Chance of rain 50 percent.

Southern Big Island

Today: In the morning it will be mostly sunny, then it will become mostly cloudy. Airy. Isolated showers. Highs range from about 83 near the coast to about 65 near 5,000 feet. East winds gusting up to 20 miles per hour. Chance of rain 20 percent.

Tonight: Airy. Mostly cloudy with a few showers in the evening, becoming partly cloudy after midnight. Lows range from about 71 near the coast to about 51 near 5,000 feet. East winds 10 to 20 mph. Chance of rain 20 percent.

Thursday: Mostly sunny. Airy. Scattered showers in the afternoon. Highs range from about 83 near the coast to about 66 near 5,000 feet. East winds 10 to 20 mph. Chance of rain 20 percent.

Puna

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Today: Partly sunny with a few showers. Highs range from 77 to 82 near the coast and around 65 at 4,000 feet. East winds up to 10 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Tonight: Mostly cloudy. Scattered showers in the evening, likely showers after midnight. Lows 62 to 68 near shore to 51 to 56 at 4,000 feet. East winds up to 10 mph. Chance of rain 70 percent.

Thursday: In the morning it will be cloudy with a chance of showers, in the afternoon it will be partly sunny with a few showers. Highs range from 77 to 82 near the coast and around 65 at 4,000 feet. East winds up to 15 mph, increasing to 6 to 15 mph in the afternoon. Chance of rain 70 percent.

Waikoloa

Today: Mostly sunny in the morning, partly sunny in the afternoon with a few showers. Highs 81 to 86 near shore to 64 to 71 above 4,000 feet. North winds with speeds of up to 24 km/h. Chance of rain 20 percent.

Tonight: In the evening it will be mostly cloudy, then it will become partly cloudy. Isolated showers. Lows range from about 72°C near the coast to 50 to 55°C above 4,000 feet. Northerly winds gusting up to 10 miles per hour, shifting to the east after midnight. Chance of rain 20 percent.

Thursday: Mostly sunny with a few showers. Highs 80 to 86 near shore to 63 to 71 above 4,000 feet. East wind up to 10 miles per hour, shifting to the north in the afternoon. Gusts up to 30 miles per hour. Chance of rain 20 percent.

Summary

Moderate east to east-south-easterly winds are gradually increasing today. Limited showers continue to be concentrated mainly in windward areas, with clouds and a few showers developing over sheltered leeward terrain in the afternoon. Trade winds will strengthen on Thursday and become windy and gusty Friday into the weekend. Precipitation will favor typical windward slopes, with an increase in showers possible towards the end of this weekend and into the first half of next week as an aloft disturbance passes overhead.

discussion

A stable east to east-southeast trade wind continues to prevail over the islands this morning as a weak low to the northwest of the state bisects a high of 1021 MB in the far northwest and a high of 1030 MB in the distant northeast. Satellite images continue to show partly to mostly cloudy skies across the region, with radar showing a mix of scattered to isolated showers over mainly windward and mauka areas. Expect trade winds to gradually strengthen today as the low to the northwest continues to weaken and high pressure begins to consolidate to the north. However, winds should remain light enough this afternoon for localized leeward sea breezes to develop, allowing some clouds and isolated showers over sheltered areas in the afternoon. However, since there are no organized areas of humidity upstream of the islands and the waves at medium heights ensure stable conditions, a limited amount of precipitation is expected today.
The forecast then shows the 1030MB high descending to the northeast on Thursday, with trade winds becoming more easterly and continuing to strengthen. Windy to locally windy traffic is then expected to develop through Friday and continue into next weekend. This results in a typical trade wind pattern with clouds and showers favoring windward and mauka areas, particularly at night and early in the morning.
The main flaw in the forecast remains the development of the upper level low currently in the distant northwest of the state. Forecasts show this upper level low moving slowly toward the state over the next few days, then stalling west of Kauai over the weekend before moving over the state early next week. This low should help boost our trade wind showers late Sunday into early next week. The forecast also suggests there is a small chance of a few isolated thunderstorms later this weekend into early next week, but confidence is low.

aviation

With a high in the northeast and a low in the northwest, winds will remain light to moderate from the east to east-southeast through Wednesday. Isolated SHRA with MVFR conditions, expected windward and mauka locations. Some isolated SHRA and MVFR conditions may extend into leeward areas but will be short-lived.
There are currently no AIRMETs in force.

marine

High pressure far northeast of the state will shift south later this week and dissipate as additional high pressure builds to the north. A weak low in the northwest part of the state will move well northwest. In response, moderate to locally strong east-southeast winds will shift away from the more typical easterly wind direction through Thursday, then strengthen and transition to fresh to locally strong winds on Friday and continue into early next week. A Small Craft Advisory (SCA) remains in effect through Thursday for typical windy waters around the Big Island and Maui. This advisory is expected to be expanded to additional waters on Thursday and Friday.
North and west facing coasts will continue to experience light surf through Friday. A small, more persistent northwesterly swell is expected to fill in Friday evening, peaking on Saturday, bringing small surf along the north and west facing coast. A storm depression currently near the Kuril Islands will trigger another small, long-lasting northwesterly swell late Sunday, maintaining small surf along the north and west coasts into early next week. Small background waves from the south will continue throughout the week. A small, longer-lasting southerly swell could fill in over the weekend and cause surf increases on south-facing shores into early next week. The small, choppy surf along the East Coast will gradually become rough and choppy Thursday into the weekend as trade returns.

HFO Watches/Warnings/Advisories

Small Craft Advisory until 6:00 p.m. HST Thursday for Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters and Big Island Southeast Waters.

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Data courtesy of NOAA.gov

Anna Harden

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