Surf Forecasts:
Kua Bay surf forecast from 4 Aug 2026:
- Most powerful swell: Saturday 8 Aug, 8PM (local time) - 3ft (0.9m), 6s period, NE swell with 47 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 0.9m 6s and forecast to arrive on Saturday (Aug 08) at 8PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Sunday (Aug 09) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sat 8th Aug) | 3ft (0.9m) 6s |
Table - best surf conditions forecast for Kua Bay over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let’s talk about what’s cookin’ for the next couple of weeks.
Right off the bat, we’re looking at a real quiet stretch. The first week or so is mostly flat with tiny, weak swell and a lot of "poor surf conditions" flagged. The water's sitting at a warm 82°F with a touch warmer than normal feel, so it’s a nice dip if you’re just floating, but don’t bother dragging the board out. You’ll be waiting through a long gap of nothing much until things start to shift around the middle of the month.
The real standout is Saturday, August 15th, especially the afternoon. Kua Bay (Big Island) finally gets a little pulse of energy. We’re talking about a 2 ft swell from the WNW, with a period of 16 seconds – that’s proper groundswell, long lines, and plenty of energy. The combined energy here is sitting at 256, which is a solid moderate kick. And the wind? Glassy calm. Zero breeze. That’s about as clean as it gets. The swell direction lines up nicely with the optimum WNW direction for this spot. Keep in mind, the longer period means it’ll be a bit more powerful and the sets might be spaced out, but at this size, it’s a treat for intermediates and up. Crowds are possible here, so don’t expect to have it all to yourself.
Friday, August 14th afternoon is a decent warm-up, with a 2 ft WNW swell, 13-second period, and glassy conditions, but the energy is a bit lower at 182. Still, a nice surfable wave if you’re itching to get wet.
Beyond that, into the second week, there are a few more pulses showing up on the 19th, but the wind gets a bit messy and the forecasts are less certain. The 19th afternoon has a 2 ft WNW swell with moderate energy (274) and light cross-shore winds, but it’s not the clean, glassy setup we see on the 15th.
So, if you’re picking one window, make it Saturday afternoon, August 15th at Kua Bay. That’s the one to circle on the calendar.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue morning, min 25°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 28°C on Sun morning, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | |||||||||||||||
AM | 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) | W 11 | NNE 6 | W 13 | W 13 | NNE 5 | W 12 | W 12 | W 12 | SSW 14 | W 12 | W 12 | NNE 5 | SSW 18 | NE 6 | NE 6 | W 13 | W 12 | W 11 | W 11 | W 11 | W 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 9 | 27 | 12 | 28 | 14 | 11 | 11 | 12 | 0 | 11 | 11 | 17 | 0 | 42 | 0 | 29 | 25 | 23 | 21 | 21 | 19 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | cross-on | cross | glassy | cross | cross | glassy | cross-on | cross | glassy | cross-on | glassy | glassy | cross-on | cross | glassy | cross-on | cross-on | glassy |
High Tide | 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 | 1:56PM0.86m | 1:52AM0.32m | 2:42PM0.90m | 2:44AM0.37m | |||||||
Low Tide | 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 | 6:14AM0.06m | 9:17PM0.14m | 7:17AM0.03m | 9:48PM0.11m | ||||||||
 |  |  | | | | | | | | | | | |  | |  |  | |  |  | |
 | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | — | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | 2 | 1 |
Temp °C | 28 | 28 | 27 | 27 | 28 | 27 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 30 | 30 | 29 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 30 | 30 | 29 | 29 | 30 | 31 | 30 | 30 | 31 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | ENE 11 | NNE 5 | NE 9 | NE 9 | NNE 4 | NE 5 | NE 5 | NE 4 | NNE 4 | NE 5 | NE 11 | NE 5 | NE 10 | NE 6 | NE 7 | NE 6 | NNE 7 | NE 7 | NE 7 | NE 7 |
| kJ | 13 | 46 | 9 | 22 | 20 | 7 | 23 | 22 | 10 | 10 | 22 | 18 | 22 | 14 | 51 | 75 | 59 | 59 | 67 | 73 | 46 |
Swell 2 Height (m) Direction Period (s) | ENE 11 | W 11 | ENE 10 | NNE 4 | W 12 | NE 8 | NE 8 | NE 8 | SSW 14 | W 12 | W 12 | SSW 13 | NE 10 | SSW 18 | NE 9 | W 13 | W 12 | W 11 | W 11 | SSW 15 | W 10 |
| kJ | 47 | 10 | 39 | 6 | 11 | 18 | 10 | 9 | 20 | 11 | 11 | 17 | 15 | 31 | 13 | 29 | 25 | 23 | 21 | 47 | 19 |
Swell 3 Height (m) Direction Period (s) | W 11 | SW 12 | W 13 | W 13 | NNE 9 | W 12 | W 12 | W 12 | ENE 7 | SSW 14 | SSW 13 | SSW 19 | SSW 18 | SSW 13 | SSW 18 | SSW 16 | NE 9 | SSW 12 | SSW 12 | W 11 | SSW 16 |
| kJ | 9 | 5 | 12 | 28 | 8 | 11 | 11 | 12 | 5 | 18 | 18 | 37 | 32 | 17 | 30 | 26 | 12 | 14 | 15 | 21 | 24 |
Wind waves Height (m) Direction Period (s) | — | NNE 6 | — | — | NNE 5 | — | — | — | — | — | — | NNE 5 | — | NE 6 | — | — | — | — | — | — | — |
| kJ | — | 27 | — | — | 14 | — | — | — | — | — | — | 17 | — | 42 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 100 | 18 | 14 | 100 | 100 | 39 | 100 | 100 | 14 | 100 | 100 | 19 | 101 | 103 | 14 | 97 | 14 | 14 | 100 | 101 | 14 |
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.
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