Surf Forecasts:
Kua Bay surf forecast from 15 Aug 2026:
- Best quality surf: Thursday 20 Aug, 5PM (local time) - 1ft (0.3m), 17s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 8PM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 58 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5PM (local time) - 1ft (0.3m), 17s period with SW swell.
Best Forecast Surf Conditions for Kua Bay this week:
The surf forecast for Kua Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 5PM. The primary swell is predicted to be 0.3m and 17s period with a secondary swell of 0.4m and 4s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Kua Bay in the next 16 days are 0.4m 13s and forecast to arrive on Tuesday (Aug 18) 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 2.3m 9s period and expected on Saturday (Aug 15) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Thu 20th Aug) | 1ft (0.3m) 17s |
| Best Surf | 5PM (Thu 20th Aug) | 1ft (0.3m) 17s |
| Most Powerful | 8PM (Tue 18th Aug) | 1.5ft (0.4m) 13s |
Table - best surf conditions forecast for Kua Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get straight into it. Honestly, looking at the next 16 days for Kua Bay, it’s a real tough stretch. The ocean is just not cooperating. We’re looking at a long, lean run with hardly anything to get excited about. The first decent-looking window doesn’t even show up until we’re well into the second week, so expect a lot of flat, small days before that.
Right from the start, Saturday the 15th, you’ve got a tiny 1ft swell from the west, with a period of 11 seconds. The energy is weak, only measuring (25). The morning is glassy, which is a tease, but the waves are just too small and poor to bother with. That afternoon, the wind cranks up to 25 mph from the ENE, making it a total write-off. Sunday the 16th isn’t any better, with a cross-on wind and a 1ft to 1ft WNW swell. The energy bumps up a bit to (60) on Sunday arvo, but the onshore wind kills it.
The whole first week is like this. We’ve got a stretch from Saturday the 15th right through to Friday the 22nd where every single session is rated as “poor surf conditions.” The swell stays tiny, mostly between 0.7ft and 1ft, and the wind is never right. Even when it goes glassy, like on the afternoon of Tuesday the 19th, the swell is just a pathetic 1ft with a 12-second period. The water temp is sitting at 82°F with a 2°F anomaly, so it’s a touch warmer than average for this time of year, but that’s the only thing going for it.
Then, there’s a glimmer. Thursday the 20th afternoon, things get interesting. The swell direction swings to the SW, and the period jumps to 17 seconds, with combined energy hitting (77). The wind goes glassy. The wave comment finally says “surfable waves but very ordinary conditions.” This is the best of the whole outlook, but it’s still just 1ft. It’s a long-period groundswell, which means it’ll be super clean on the surface, but it’s going to be weak and inconsistent. For a spot like Kua Bay that’s exposed to WNW, this SW direction isn’t ideal, but with the glassy conditions, it’s the only moment worth paddling out.
After that, the last week of the month is a back to the same story. From the 21st through the 30th, we’ve got a few afternoons with clean, offshore winds, like the 23rd, 25th, and 26th, but the swell is either non-existent or tiny. On Tuesday the 26th, the morning is glassy with a 2ft swell from the NNE, but the period is a terrible 5 seconds, so it’s just wind chop. The energy is (27). It’s not surfable.
The real standout, if you can call it that, is the afternoon of Thursday the 20th. It’s the only moment the guidance gives a score above zero, and with the glassy wind and a touch of SW groundswell, it’s the pick of a very poor bunch. The period is long at 17 seconds, so expect long waits between sets. It’s not a beginner wave, but the conditions will be clean.
For the rest of the run, from the 15th to the 30th, there are huge gaps. You’re looking at a 5-day stretch from the 15th to the 19th with absolutely nothing rideable. Then after the 20th, you’re back to flat or poor conditions until the 30th. It’s a grim outlook.
Kua Bay is a fairly consistent spot, so this blank run is a bit of a surprise, but it happens. The forecasts can change, but right now, the ocean is asleep. Honestly, with the tiny swell and the poor quality, this setup looks more interesting for a paddle around on a SUP than a surf. If you’re desperate, bring a longboard and pray for the 20th afternoon.
Rusty.
Short Range ForecastHeavy rain (total 42mm), heaviest during Sat night. Warm (max 28°C on Sat morning, min 26°C on Sat night). Winds decreasing (strong winds from the ENE on Sat afternoon, calm by Mon night). | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Tue night. Warm (max 28°C on Thu afternoon, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 | NE 9 | NNE 8 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | SW 16 | SW 18 | SW 17 | WNW 11 | W 10 | SW 16 | W 10 |
Wave Graph | |||||||||||||||||||||
21 | 0 | 0 | 32 | 49 | 27 | 25 | 25 | 25 | 25 | 25 | 33 | 48 | 28 | 41 | 49 | 47 | 11 | 9 | 39 | 8 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross | cross-on | on | cross | cross | cross | glassy | cross | glassy | cross | cross | glassy | glassy | on | glassy | cross | cross-on | cross-on | cross-off |
High Tide | 5:36PM0.67m | 6:30AM0.60m | 6:02PM0.58m | 7:19AM0.61m | 6:25PM0.49m | 8:16AM0.61m | 6:42PM0.41m | 9:26AM0.61m | 10:49AM0.62m | 12:03PM0.64m | 11:29PM0.26m | ||||||||||
Low Tide | 11:27AM0.17m | 00:06AM0.08m | 12:18PM0.24m | 00:32AM0.09m | 1:18PM0.30m | 00:58AM0.11m | 2:41PM0.35m | 1:28AM0.14m | 2:09AM0.16m | 3:15AM0.18m | 8:38PM0.25m | ||||||||||
6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:52 | — | — | 6:51 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:49 | — | — | 6:47 | — | |
mm | 1 | 4 | 34 | 1 | — | — | — | — | 2 | — | — | 2 | — | — | — | — | — | 1 | — | — | — |
Temp °C | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 27 | 27 | 26 | 27 | 27 | 27 | 27 | 28 | 26 | 27 | 27 | 26 |
Feels °C | 32 | 32 | 29 | 30 | 30 | 33 | 32 | 31 | 33 | 31 | 31 | 31 | 30 | 30 | 32 | 30 | 32 | 30 | 30 | 30 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | NE 9 | NNE 8 | NE 8 | NE 8 | NE 7 | NE 6 | NE 6 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NE 5 | NE 6 | NNE 6 | NNE 6 | NE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 |
35 | 763 | 106 | 78 | 86 | 64 | 45 | 39 | 17 | 15 | 15 | 8 | 21 | 24 | 35 | 26 | 10 | 34 | 33 | 33 | 31 | |
Swell 2 Height (m) Direction Period (s) | W 11 | ENE 10 | SSW 10 | SW 6 | SW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 |
21 | 112 | 52 | 18 | 11 | 27 | 25 | 25 | 25 | 25 | 25 | 33 | 48 | 28 | 25 | 49 | 47 | 69 | 69 | 39 | 64 | |
Swell 3 Height (m) Direction Period (s) | W 15 | NE 12 | ENE 9 | WNW 13 | WNW 12 | SW 5 | SW 5 | S 14 | NE 8 | ENE 8 | W 13 | ENE 7 | SSW 16 | NNE 7 | SW 16 | WNW 11 | WNW 11 | WNW 11 | W 10 | W 10 | W 10 |
4 | 40 | 31 | 32 | 49 | 4 | 1 | 16 | 9 | 6 | 14 | 5 | 26 | 9 | 41 | 24 | 23 | 11 | 9 | 9 | 8 | |
Wind waves Height (m) Direction Period (s) | NE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 4 | — | — | — | — |
401 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 4 | 16 | 4 | 20 | 98 | 97 | 100 | 100 | 100 | 98 | 100 | 93 | 30 | 4 | 4 | 30 | 0 | 19 | 32 | 97 | 26 |
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.











