Hilo

Today: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 80 to 87 near the shore to 66 to 73 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 40 percent.

Tonight: Mostly cloudy with scattered showers. Lows 64 to 72 near the shore to 55 to 60 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered showers. Highs 80 to 87 near the shore to 65 to 72 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Kona

Today: Mostly sunny with isolated showers. Highs 84 to 89 near the shore to 69 to 74 near 5000 feet. Light winds. Gusts up to 35 mph in the morning. Chance of rain 20 percent.

Tonight: Mostly clear. Isolated showers in the evening. Lows around 74 near the shore to 54 to 59 near 5000 feet. Light winds. Chance of rain 20 percent.

Monday: Mostly sunny. Scattered showers in the afternoon. Highs 84 to 89 near the shore to around 72 near 5000 feet. Northeast winds up to 10 mph shifting to the west in the afternoon. Chance of rain 30 percent.

Waimea

Today: Breezy. Mostly sunny with isolated showers. Highs around 81 near the shore to 70 to 80 near 3000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Tonight: Breezy. Partly cloudy with isolated showers. Lows 64 to 73 near the shore to 57 to 63 near 3000 feet. East winds 10 to 20 mph. Chance of rain 20 percent.

Monday: Breezy. Mostly sunny with isolated showers. Highs around 81 near the shore to 71 to 80 near 3000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

Kohala

Today: Breezy. Mostly sunny with isolated showers. Highs around 81 near the shore to 70 to 80 near 3000 feet. East winds up to 20 mph increasing to 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Tonight: Breezy. Partly cloudy with isolated showers. Lows 64 to 73 near the shore to 57 to 63 near 3000 feet. East winds 10 to 20 mph. Chance of rain 20 percent.

Monday: Breezy. Mostly sunny with isolated showers. Highs around 81 near the shore to 71 to 80 near 3000 feet. East winds 10 to 25 mph. Chance of rain 20 percent.

South Big Island

Today: Sunny and breezy. Isolated showers in the afternoon. Highs around 86 near the shore to around 70 near 5000 feet. East winds up to 25 mph becoming 10 to 20 mph in the afternoon. Chance of rain 20 percent.

Tonight: Mostly clear. Lows around 75 near the shore to around 55 near 5000 feet. East winds 10 to 15 mph.

Monday: Sunny. Isolated showers in the afternoon. Highs around 86 near the shore to around 70 near 5000 feet. East winds 10 to 15 mph. Chance of rain 20 percent.

Puna

Today: Partly sunny with scattered showers in the morning, then mostly sunny with isolated showers in the afternoon. Highs 80 to 87 near the shore to 66 to 73 at 4000 feet. Northeast winds up to 15 mph. Chance of rain 40 percent.

Tonight: Mostly cloudy with scattered showers. Lows 64 to 72 near the shore to 55 to 60 at 4000 feet. Northeast winds up to 10 mph. Chance of rain 50 percent.

Monday: Partly sunny with scattered showers. Highs 80 to 87 near the shore to 65 to 72 at 4000 feet. Northeast winds up to 15 mph increasing to 10 to 15 mph in the afternoon. Chance of rain 50 percent.

Waikoloa

Today: Sunny. Highs 85 to 90 near the shore to 67 to 74 above 4000 feet. Northeast winds up to 15 mph.

Tonight: Mostly clear. Lows around 75 near the shore to around 56 above 4000 feet. North winds up to 15 mph shifting to the east after midnight.

Monday: Sunny. Highs 84 to 91 near the shore to 68 to 74 above 4000 feet. East winds up to 15 mph shifting to the north in the afternoon. Gusts up to 35 mph.

Detailed Forecast

Synopsis

Locally breezy trade winds will prevail into next week. Partly to mostly cloudy skies across windward and mauka areas with scattered showers mainly during the overnight and early mornings. Partly cloudy with isolated showers leeward.

Discussion

High pressure remains centered far north of the main Hawaiian Islands driving locally breezy easterly trade winds across the state. Latest satellite and radar imagery continues to show scattered to broken low clouds with scattered showers moving into windward and mauka sections of Kauai and Oahu. Comparatively stable closed-cell cumulus clouds are moving onto windward Big Island with isolated showers. Expect decreasing shower coverage by midday across the smaller islands with steady clouds and showers impacting the windward Big Island today.
Very little change is anticipated through the next week with only minor fluctuations in trade wind speeds each day and a continued stable atmosphere. Mostly sunny/clear conditions are expected leeward, while partly to mostly cloudy skies and few passing showers are expected windward and mauka sides of the islands. Any passing showers are most likely to occur during the overnight through early morning hours. However, daytime heating will lead to sea breeze development and cloud build ups along the Kona slopes of the Big Island.

Aviation

A high pressure ridge far north of the Hawaiian Islands will continue to produce moderate to breezy trade winds through at least Monday. Brief showers will develop, mainly over windward and mountain areas, favoring the overnight to early morning hours. VFR conditions will prevail outside of showers.
AIRMET Tango remains in effect for moderate low level turbulence over and downwind of island mountains. Conditions are expected to persist through at least Monday.

Marine

Fresh to strong easterly trade winds will continue through the week as high pressure remains positioned far north of the area. As a result, no changes are anticipated to the Small Craft Advisory in place for the windier waters and channels around Maui County and the Big Island through the week.
Surf along south facing shores will trend up Monday as a long- period southwest swell from the Tasman Sea arrives and begins to move through. Observations at the American Samoa PacIOOS buoy showed this swell peaking early Saturday, which will result in a local peak between Tuesday and Wednesday. A return of smaller surf with mainly background southerly sources is expected later this week.
Surf along east facing shores will remain rough and choppy each day due to the persistent fresh onshore breezes. Wave guidance shows the peak period holding around 6-7 seconds through much of the week.
As we head into August, water levels are running higher than predicted (0.3 to 0.6 ft) statewide due to a combination of our peak annual tides and a sea level anomaly moving through. This will lead to minor coastal flooding through the afternoon periods around the peak daily high tides each day through midweek for the typical vulnerable low-lying coastal areas and beaches. See the latest Coastal Flood Statement for more details.

HFO Watches/Warnings/Advisories

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

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Data Courtesy of NOAA.gov