Hawaii County climate forecast is September 15, 2021

Hilo

Today: Mostly cloudy. Isolated showers in the morning, then showers in the afternoon. In the afternoon, heavy rainfall is possible locally. Heights 79 to 85 near shore to 65 to 71 at 4000 feet. South-easterly wind with up to 16 km / h, which increases to 10 to 24 km / h in the afternoon. Chance of rain 90 percent.

Tonight: cloudy. Showers in the evening, then showers probably after midnight. In the evening, heavy rainfalls are possible locally. Lows of 65 to 73 near shore to 56 to 61 to 4000 feet. South wind up to 10 km / h. Chance of rain 90 percent.

Thursday: Probably cloudy with showers. Heights 79 to 85 near shore to 65 to 71 at 4000 feet. East winds 10 to 15 miles per hour. Chance of rain 70 percent.

Kona

Today: Mostly sunny in the morning, then mostly cloudy with a few showers in the afternoon. Highs from about 86 near shore to about 68 near 5000 feet. West winds up to 10 km / h. Chance of rain 20 percent.

Tonight: Mostly cloudy with a few showers. Lows of 71 to 76 near shore to 52 to 58 near 5000 feet. Breeze. Chance of rain 20 percent.

THE ARTICLE CONTINUES BELOW THE ADVERT

Thursday: Mostly cloudy. Isolated showers in the morning, then isolated showers in the afternoon. Highs from 84 to 89 near shore to about 70 near 5000 feet. Breeze. Chance of rain 40 percent.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Mostly cloudy. A few showers in the morning, then probably in the afternoon. Altitudes 66 to 85. Northeasterly winds up to 15 miles per hour. Chance of rain 70 percent.

Tonight: cloudy. Showers probably in the evening, then isolated showers after midnight. Lows of 65 to 72 near shore to 59 to 65 near 3000 feet. Southeasterly winds up to 15 miles per hour. Chance of rain 70 percent.

Thursday: windy. Probably cloudy with showers. Highs 66 to 85. East winds 10 to 20 miles per hour. Chance of rain 70 percent.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Mostly cloudy. A few showers in the morning, then probably in the afternoon. Altitudes 66 to 85. Northeasterly winds up to 15 miles per hour. Chance of rain 70 percent.

Tonight: cloudy. Showers probably in the evening, then isolated showers after midnight. Lows of 65 to 72 near shore to 59 to 65 near 3000 feet. Southeasterly winds up to 15 miles per hour. Chance of rain 70 percent.

Thursday: windy. Probably cloudy with showers. Highs 66 to 85. East winds 10 to 20 miles per hour. Chance of rain 70 percent.

Southern big island

Today: Mostly sunny in the mornings, then mostly cloudy. Airy. Isolated showers. Heights from 85 near shore to 67 near 5000 feet. East wind up to 32 km / h, which increases to 10 to 20 km / h in the afternoon. Chance of rain 20 percent.

Tonight: Mostly cloudy. Airy. Isolated showers in the evening. Lows of 74 near shore to about 55 near 5000 feet. Northeast winds 10 to 20 miles per hour. Chance of rain 40 percent.

Thursday: Mostly cloudy. Airy. Isolated showers in the morning, then isolated showers in the afternoon. Highs from about 85 near shore to about 68 near 5000 feet. East winds 10 to 20 miles per hour. Chance of rain 40 percent.

feedback

Today: Mostly cloudy. Isolated showers in the morning, then showers in the afternoon. In the afternoon, heavy rainfall is possible locally. Heights 79 to 85 near shore to 65 to 71 at 4000 feet. South-easterly wind with up to 16 km / h, which increases to 10 to 24 km / h in the afternoon. Chance of rain 90 percent.

Tonight: cloudy. Showers in the evening, then showers probably after midnight. In the evening, heavy rainfalls are possible locally. Lows of 65 to 73 near shore to 56 to 61 to 4000 feet. South wind up to 10 km / h. Chance of rain 90 percent.

Thursday: Probably cloudy with showers. Heights 79 to 85 near shore to 65 to 71 at 4000 feet. East winds 10 to 15 miles per hour. Chance of rain 70 percent.

Waikoloa

Today: Mostly sunny in the morning, then partly sunny. Isolated showers. Heights from 85 to 90 near shore to 67 to 73 over 4000 feet. Northwest winds up to 10 km / h. Chance of rain 20 percent.

Tonight: Mostly cloudy. Isolated showers in the evening. Lows of 75 near shore to 52 to 57 over 4000 feet. Breeze. Chance of rain 20 percent.

Thursday: Mostly cloudy. A few showers in the afternoon. Heights from 84 to 90 near shore to 68 to 74 over 4000 feet. North winds up to 10 km / h. Chance of rain 20 percent.

summary

A trough north of the state will weaken the winds in the light to moderate range today. A sea breeze develops that could trigger more showers in the afternoon and evening hours. Moisture entering from the southeast will create more showers tonight, mostly in the windward Big Island areas. Trade winds will pick up on Thursday and conditions are expected to dry up as the day progresses. Then expect a trade wind weather pattern during the forecast period.

discussion

An upper low in the far north moved southwest overnight and is a few hundred miles north of Oahu this morning. The surface valleys associated with this upper low will pass north of the state today, causing local winds to subside and turn east-southeast. Localized ocean breezes will result in isolated showers across the state. Some of these showers can be briefly violent in the afternoon due to the instability associated with the nearby upper low.
Increased moisture is expected to seep in from the southeast this afternoon and tonight, heating briefly heavy showers in the east and southeast facing areas of the Big Island and Maui. The rest of the island chain is shaded by the Big Island, but there may be occasional showers, some of which are briefly heavy.
Thursday will be a transition day as the low point moves away from the state and high pressure builds up in the north. Chill conditions are still expected as breezy trades return from the east. Persistent humidity and instability are expected over the western end of the state, which could result in brief, heavy rains over Kauai on Thursday. Strong trade winds will return over the state with drier conditions by Friday. A trade wind weather pattern is then expected to continue for the remainder of the forecast period.

aviation

An upper low passing north of the Hawaiian Islands will add to the showers and clouds throughout the region into Thursday. Light to moderate trade winds will drive these clouds over each island and favor the windward and mountainous areas. Short periods of time with MVFR conditions are possible, favoring the night until the early hours of the morning.
Mountain Obscuration AIRMETs remain in effect for northern and eastern sections from Kauai to the Big Island.

marine

A depression will pass by the north of the state tonight and tonight, facilitating trade throughout the marine area. Trades will rise again to locally strong levels on Thursday through the weekend, when the bottom ends and a new high forms north of the island chain. Winds are likely to hit the Small Craft Advisory (SCA) thresholds over the normally windy waters around Maui and the Big Island on Thursday, with SCAs expected to be extended to most, if not all, waters on Friday and Saturday. Trades should then ease slightly from Sunday to early next week as the high in the Far North subsides.
A series of long south and southwest swells along the south-facing banks will keep the surf near to slightly above the September average through Thursday, before gradually subsiding from Friday to early next week. On the north-facing banks, small surf will prevail for the remainder of the working week, with a small wave from a north-west swell expected this weekend. Another small but slightly larger northwest swell is possible on Tuesday and Wednesday of the next week. The surf on the east coast will remain well below normal today, rising to near-seasonal levels from Thursday to Saturday when the trade winds increase over and upstream of the islands, and then sink one level lower on Sunday through early next week when the trade winds subside.

HFO watches / warnings / notices

None.

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Data courtesy of NOAA.gov

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