Hilo

Rest Of Tonight: Mostly cloudy with scattered showers early in the evening, then partly cloudy with isolated showers after midnight. Lows 63 to 69 near the shore to 53 to 58 at 4000 feet. Light winds. Chance of rain 50 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Isolated showers. Highs 78 to 83 near the shore to around 69 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 20 percent.

Tuesday Night: Mostly cloudy. Isolated showers in the evening. Lows 63 to 69 near the shore to around 56 at 4000 feet. Light winds. Chance of rain 20 percent.

Kona

Rest Of Tonight: Mostly cloudy with scattered showers early in the evening, then partly cloudy with isolated showers after midnight. Lows around 73 near the shore to 50 to 56 near 5000 feet. Light winds. Chance of rain 50 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Highs 81 to 86 near the shore to around 67 near 5000 feet. West winds up to 10 mph.

Tuesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows around 73 near the shore to 50 to 56 near 5000 feet. Light winds.

Waimea

Rest Of Tonight: Partly cloudy. Isolated showers early in the evening. Lows 64 to 71 near the shore to 58 to 63 near 3000 feet. Light winds. Chance of rain 20 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Highs 75 to 81 near the shore to 70 to 77 near 3000 feet. Light winds.

Tuesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 64 to 72 near the shore to 57 to 62 near 3000 feet. Light winds.

Kohala

Rest Of Tonight: Partly cloudy. Isolated showers early in the evening. Lows 64 to 71 near the shore to 58 to 63 near 3000 feet. Light winds. Chance of rain 20 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Highs 75 to 81 near the shore to 70 to 77 near 3000 feet. Light winds.

Tuesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows 64 to 72 near the shore to 57 to 62 near 3000 feet. Light winds.

South Big Island

Rest Of Tonight: Mostly cloudy early in the evening then becoming mostly clear. Isolated showers early in the evening. Lows around 73 near the shore to around 55 near 5000 feet. East winds up to 15 mph early in the evening becoming light. Chance of rain 20 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Highs around 84 near the shore to around 65 near 5000 feet. South winds up to 10 mph.

Tuesday Night: Mostly cloudy. Lows around 73 near the shore to around 55 near 5000 feet. Light winds.

Puna

Rest Of Tonight: Mostly cloudy with scattered showers early in the evening, then partly cloudy with isolated showers after midnight. Lows 63 to 69 near the shore to 53 to 58 at 4000 feet. Light winds. Chance of rain 50 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Isolated showers. Highs 78 to 83 near the shore to around 69 at 4000 feet. Southeast winds up to 10 mph. Chance of rain 20 percent.

Tuesday Night: Mostly cloudy. Isolated showers in the evening. Lows 63 to 69 near the shore to around 56 at 4000 feet. Light winds. Chance of rain 20 percent.

Waikoloa

Rest Of Tonight: Partly cloudy. Isolated showers early in the evening. Lows around 73 near the shore to 53 to 58 above 4000 feet. Light winds. Chance of rain 20 percent.

Tuesday: Sunny in the morning then becoming partly sunny. Highs around 84 near the shore to around 70 above 4000 feet. Northwest winds up to 10 mph.

Tuesday Night: Mostly cloudy in the evening then becoming partly cloudy. Lows around 74 near the shore to 53 to 58 above 4000 feet. Light winds.

Detailed Forecast

Synopsis

Lighter winds are expected Tuesday and Wednesday as a low passes north of the state. Along with the lighter winds, expect a few clouds and showers over the interior parts of the islands during the afternoon and evening hours. As the low moves to the northeast late Wednesday, a ridge will build in to the north of the islands. This will allow trade winds to build back into the region during the second half of the week. By the weekend, more typical trade wind showers will reach the islands on the trade wind flow.

Short term update

With the shortwave aloft moving east of the islands, convection over the area has ceased, and the forecast was updated to remove thunderstorms on the Big Island this evening and make minor changes to tonight's forecast. The forecast looks good for the rest of the week.

Prev discussion

Issued at 345 PM HST Mon Apr 20 2026 The shortwave trough that passed through the islands earlier today has moved to the east. Some thunderstorms formed over the Big Island slopes around midday, but have died off this afternoon. Another stray thunderstorm is possible through the evening hours.
A low pressure system north of the islands is helping to keep winds light, and that is expected to continue into Wednesday. The lighter winds will result in some localized land and sea breezes. This in turn will lead to some clearing overnight, with some afternoon clouds and showers forming over the interior of the islands.
The second half of the week should see the low move to the far northeast of the islands, and that will allow a new ridge to build north of the region. This will allow trade winds to build across the area during the latter part of the week. A ridge aloft will help to provide a stable airmass over the region with limited shower activity. Moisture upstream of the islands will be carried in on the returning trade wind flow and will likely reach the islands over the weekend, bringing a return to more typical trade wind shower activity by the end of the weekend.

Aviation

Generally light winds continue across all terminals this evening, expected to persist through the next couple of days. Onshore sea breezes will bring interior clouds and light showers, followed by overnight clearing with emerging offshore land breezes. Expect low-MVFR/IFR due to low cloud ceilings. Otherwise, VFR conditions prevail.
No AIRMETs in effect.

Marine

Issued at 345 PM HST Mon Apr 20 2026 A series of lows and troughs northwest and north of the islands will act to keep weak to locally moderate east southeast flow in place across the local waters through early Wednesday. Light wind flow should allow for afternoon sea breeze development near the shores. By Late Wednesday through this weekend, surface high pressure building north of the area will bring a return of moderate to locally strong trades.
Forerunners from a small, medium- period, northwest swell are still on track to arrive late tonight, with this swell forecast to build Tuesday and peak on Wednesday. This should bring an uptick in surf along north facing shores.
A moderate, medium- period north- northeast swell arrives on Tuesday and peaks also on Wednesday, bringing moderate surf to north and northeast facing shores, before slowly declining through the end of the week. East facing shores will see an increase in surf with wrap from the aforementioned north-northeasterly swell despite below- seasonal average trades. Strengthening trades late this week will also give east facing shores a bump in surf.
Surf will continue to be small along south facing shores through the period.

HFO Watches/Warnings/Advisories

None.

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Data Courtesy of NOAA.gov