Surf Forecasts:
Kua Bay surf forecast from 17 Aug 2026:
- Most powerful swell: Tuesday 18 Aug, 11PM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 57 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 13s and forecast to arrive on Tuesday (Aug 18) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 8s period and expected on Sunday (Aug 16) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (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 talk about the surf outlook for Kua Bay.
First off, I gotta be straight with you—this is a tough run. We’re looking at a full 16-day window, and honestly, there’s nothing good on offer. The first potential surf recommendation starts on the 16th of August, but it’s a no-go from the jump. The whole period is a washout for decent waves. There aren’t even any standout days to get excited about.
Right from the start, on Sunday the 16th, we’ve got tiny 1ft to 1ft swell from the WNW and WSW, but the wind is all wrong—cross-on and choppy. It’s a risk of thunderstorms too, so you’re not missing anything. The combined energy is a weak 32 and 14, which is basically nothing. Water temp is sitting at 82°, which is about normal for this time of year, so no surprises there.
Monday the 17th and Tuesday the 18th are glassy—totally clean conditions—but the swell is still just 1ft. You could paddle around, but you’re not catching anything worth writing home about. That pattern of tiny, clean surf with no power just keeps going.
We do see a little bump in energy midweek. On Wednesday the 19th, the combined energy hits 48 in the morning and 70 in the afternoon, with a 1ft to 1ft swell, but it’s coming from the SW with a long period of 16 seconds. That’s a long-period groundswell, which can be good for shape, but the height is just too small to do anything with.
The rest of the first week and into the second week is more of the same. Tiny waves, weak energy, and mostly poor surf conditions. Even when we get a 2ft to 3ft bump on Tuesday the 25th from the NNE, the period is a short 5 to 6 seconds, and the energy is only 29 to 48. That’s just windswell crap. It’s too small for any real fun.
From the 27th of August onward, it gets even worse. There are days with zero swell energy—completely flat. A tiny 0.7ft wave pops up here and there, but we’re talking about barely a ripple.
Bottom line: there’s nothing worth paddling out for in the next 16 days. The forecast shows consistent small, weak surf with no quality. This is one of those runs where you’re better off checking the forecasts again later. It’s unusual for the area to have such a blank stretch, but it happens. Don’t force it. Stay patient.
Rusty.
Short Range ForecastModerate rain (total 10mm), heaviest on Sun afternoon. Warm (max 29°C on Sun morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Wed afternoon, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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) | WNW 13 | WSW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | SW 16 | SW 16 | SW 18 | SW 17 | W 11 | W 10 | W 10 | W 10 | SW 15 | W 10 | SW 15 |
Wave Graph | |||||||||||||||||||||
32 | 14 | 27 | 25 | 25 | 25 | 25 | 25 | 33 | 48 | 42 | 41 | 49 | 47 | 9 | 9 | 8 | 18 | 37 | 17 | 35 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-off | glassy | glassy | glassy | glassy | cross-off | cross-off | on | on | glassy | cross-on | on | cross-off | on | cross-on | cross | cross-on | cross | glassy |
High Tide | 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 | 12:58PM0.68m | 00:53AM0.29m | ||||||||||
Low Tide | 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 | 8:45PM0.21m | |||||||||||
6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:51 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | |
mm | 2 | 4 | 1 | — | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 28 | 27 | 28 | 27 | 27 | 27 | 27 | 27 | 28 | 27 | 27 | 27 | 26 | 27 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 34 | 32 | 32 | 32 | 33 | 32 | 31 | 31 | 30 | 29 | 30 | 31 | 30 | 30 | 30 | 30 | 31 | 31 | 30 | 29 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 8 | NE 8 | NE 7 | NE 7 | NE 6 | NNE 5 | NNE 5 | NNE 5 | NNE 4 | NNE 4 | NNE 6 | NNE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NE 7 | NNE 6 | NE 6 | NE 7 | NE 7 |
115 | 93 | 65 | 52 | 52 | 22 | 18 | 17 | 8 | 7 | 13 | 23 | 23 | 17 | 27 | 19 | 36 | 28 | 32 | 75 | 38 | |
Swell 2 Height (m) Direction Period (s) | SW 6 | WSW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | ENE 7 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 15 |
19 | 14 | 27 | 25 | 25 | 25 | 25 | 5 | 33 | 48 | 28 | 25 | 49 | 47 | 69 | 69 | 65 | 64 | 37 | 63 | 35 | |
Swell 3 Height (m) Direction Period (s) | WNW 13 | SSW 6 | WSW 5 | WSW 5 | S 14 | ENE 8 | NE 7 | WNW 11 | ENE 7 | ENE 7 | SW 16 | SW 16 | WNW 11 | WNW 11 | W 11 | W 10 | W 10 | W 10 | W 10 | W 10 | WNW 10 |
32 | 13 | 5 | 2 | 16 | 6 | 8 | 25 | 5 | 5 | 42 | 41 | 24 | 23 | 9 | 9 | 8 | 18 | 17 | 17 | 20 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 51 | 20 | 26 | 4 | 4 | 100 | 4 | 26 | 4 | 98 | 22 | 4 | 30 | 32 | 18 | 100 | 19 | 14 | 97 | 30 | 97 |
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.











