
Surf Forecasts:
Kua Bay surf forecast from 3 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 8PM (local time) - 1.5ft (0.4m), 14s period, W swell with 62 kJ wave energy.
Best Forecast Surf Conditions for Kua Bay this week:
The most powerful waves expected at Kua Bay in the next 16 days are 0.4m 14s and forecast to arrive on Sunday (Aug 09) at 8PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Saturday (Aug 08) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sun 9th Aug) | 1.5ft (0.4m) 14s |
Table - best surf conditions forecast for Kua Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s take a look at what’s cookin’ for the next couple weeks.
Right off the bat, I gotta be straight with you – the first week is a tough one. We’re looking at a real dry spell. From now all the way through to the morning of the 11th of August, it’s mostly flat or just tiny, weak dribble. The swell is tiny, mostly around 0.7ft to 1ft, coming from the north or west, with short periods around 9 to 13 seconds. The combined wave energy is super weak, rarely cracking 30 (that’s a 15 or 28 reading). The wind is mostly a light cross or cross-onshore breeze, which is okay for keeping it small, but there’s just no power to work with. Water temp is sitting at a nice 81°F, which is about 2°F warmer than usual for this time of year – feels like a warm bath.
Then, things start to get interesting. The first real chance of a wave we can call a surf comes on the morning of Tuesday the 12th of August. We start seeing a 2ft swell from the west, with a period of 14 seconds, and the combined energy bumps up to a moderate 200. It’s still a bit messy with a cross-onshore wind, but it’s a sign of life.
The standout moment, the one you’ve been waiting for, is the afternoon of Friday, the 14th of August. Kua Bay (Big Island) is the pick. The swell is a solid 2ft from the west, with a period of 15 seconds. That’s a long-period groundswell, which means proper shape and energy. The combined energy is a strong 296 – that’s the real deal. And the wind? It’s glassy. Zero wind. The water will be like a mirror. That’s a rare treat for a spot that usually gets a bit of a breeze. The waves will be clean, lined up, and perfect for an intermediate surfer. The optimum swell direction for this spot is WNW, and this west swell is close enough to do the job nicely. Just keep in mind, crowds are possible here, so get out there early or be ready to share.
The next day, Saturday the 15th of August, the morning is a bit iffy with a cross-shore, but the afternoon cleans up again with a light cross-offshore breeze and a 2ft west swell at 14 seconds. It’s a solid backup if you missed Friday.
Looking further out, the 16th and 17th of August still have some waist-high plus swell hanging around, but the wind starts to get a bit more onshore again, making it a little less clean. It’s worth keeping an eye on, but nothing beats that Friday afternoon glass-off.
So, to sum it up: the first week is a write-off. Get your gear ready, because the window opens on the 12th, and it peaks with a beautiful, glassy session at Kua Bay on the afternoon of the 14th. That’s your time to shine.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon night. Warm (max 27°C on Sun afternoon, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 25°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sun 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map | ||||||||||||||||||||
Wave Height (m) Direction Period (s) | N 9 | N 9 | W 11 | W 12 | W 12 | W 11 | ENE 11 | W 13 | W 13 | W 12 | W 12 | W 12 | W 12 | SSW 14 | W 12 | W 12 | NE 6 | NE 7 | NE 6 | NE 7 |
Wave Graph | ||||||||||||||||||||
15 | 6 | 10 | 10 | 11 | 9 | 0 | 13 | 28 | 11 | 11 | 11 | 12 | 0 | 11 | 11 | 0 | 0 | 0 | 0 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-on | cross-on | cross | cross-on | cross-on | cross-off | cross-on | cross | glassy | cross-on | cross | glassy | cross-on | cross-on | glassy | cross-on | glassy | glassy |
High Tide | 6:05PM0.65m | 7:15AM0.55m | 6:33PM0.57m | 8:16AM0.59m | 7:03PM0.49m | 9:30AM0.63m | 7:38PM0.40m | 10:50AM0.68m | 8:46PM0.32m | 12:04PM0.74m | 11:08PM0.28m | 1:05PM0.81m | 00:47AM0.29m | |||||||
Low Tide | 00:48AM0.09m | 12:48PM0.28m | 1:18AM0.09m | 2:06PM0.34m | 1:54AM0.09m | 4:10PM0.36m | 2:41AM0.10m | 6:56PM0.32m | 3:45AM0.09m | 8:07PM0.25m | 5:01AM0.08m | 8:44PM0.19m | ||||||||
— | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
7:00 | — | — | 6:59 | — | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 27 | 26 | 26 | 27 | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 28 | 28 | 27 |
Feels °C | 29 | 30 | 29 | 28 | 30 | 30 | 29 | 30 | 29 | 29 | 29 | 29 | 28 | 30 | 29 | 30 | 31 | 31 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | NNE 6 | N 6 | NNE 6 | N 6 | ENE 11 | ENE 11 | ENE 10 | ENE 9 | NNE 4 | NE 5 | NE 5 | NE 5 | NNE 4 | NE 5 | NE 6 | NE 6 | NE 9 | NE 6 | NE 7 |
36 | 44 | 20 | 20 | 17 | 47 | 46 | 39 | 33 | 12 | 13 | 12 | 21 | 7 | 16 | 54 | 24 | 12 | 64 | 86 | |
Swell 2 Height (m) Direction Period (s) | NE 8 | NE 8 | NE 8 | NE 8 | ENE 11 | NNE 6 | NE 4 | NNE 6 | NNE 5 | NE 9 | NE 8 | NE 8 | NE 8 | SSW 14 | W 12 | W 12 | NE 7 | SSW 18 | SSW 18 | SSW 18 |
51 | 31 | 30 | 16 | 48 | 12 | 7 | 10 | 5 | 21 | 18 | 10 | 9 | 20 | 11 | 11 | 8 | 32 | 31 | 30 | |
Swell 3 Height (m) Direction Period (s) | N 9 | N 9 | W 11 | W 12 | W 12 | W 11 | NNE 6 | W 13 | W 13 | W 12 | W 12 | W 12 | W 12 | ENE 7 | ENE 7 | SSW 13 | NE 11 | SSW 13 | NE 10 | SSW 13 |
15 | 6 | 10 | 10 | 11 | 9 | 6 | 13 | 28 | 11 | 11 | 11 | 12 | 5 | 5 | 18 | 18 | 16 | 15 | 17 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 7 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 42 | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 100 | 4 | 98 | 100 | 51 | 51 | 98 | 39 | 100 | 101 | 20 | 100 | 100 | 96 | 98 | 101 | 97 | 98 | 14 | 4 |
Best forecast wave conditions in Big Island | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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Information about the Kua Bay Surf forecast
The above surf forecast table for Kua Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kua Bay can be found by selecting the local surf guide option on the grey menu. Our Kua Bay surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Kua Bay) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Kua Bay may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Kua Bay is 97 km (60 miles) from Hilo. If you plan a vacation in Big Island, look for hotels and other accommodation in Hilo. Hilo has rooms for a wide range of budgets as well as car hire and transport links.











