Surf Forecasts:
Kua Bay surf forecast from 9 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 2PM (local time) - 2.5ft (0.8m), 5s period, NNE swell with 37 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 0.8m 5s and forecast to arrive on Thursday (Aug 13) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 13s period and expected on Sunday (Aug 16) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Thu 13th Aug) | 2.5ft (0.8m) 5s |
Table - best surf conditions forecast for Kua Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you—this is a tough one to write. For the entire 16-day window, from now through August 24th, Kua Bay is showing nothing but poor surf conditions. There isn’t a single session I can honestly recommend paddling out for. The first chance at a wave comes on Sunday the 9th, but it’s tiny, weak, and bumpy, so it’s not a real option.
The whole stretch is a long, flat, and blown-out run. The combined swell energy barely cracks triple digits just once, hitting 107 (moderate energy) on Tuesday the 18th, but with a small 2ft swell from the west, a period of 13 seconds, and a moderate cross-onshore wind, it’s just messy. Most other days, the energy is in the single or double digits—weak stuff. The swell heights are consistently under 3ft, with periods mostly between 10 and 13 seconds, so there’s just no push.
The water temperature is sitting at 82°, which is a touch warmer than normal for this time of year, so you won’t need a wetsuit, but you’ll be floating around with nothing to ride.
The only faint glimmer comes on Wednesday the 19th, when the afternoon turns glassy with a 2ft, 12-second west swell, but the energy is still low (72) and the wave comment says poor. Not worth the drive. We also see a couple of glassy windows on the 21st and 24th, but with tiny, short-period windswell, they’re just not going to offer anything rideable.
Kua Bay is an exposed spot, and it’s fairly consistent, so when the ocean remembers how to send energy, this place can fire. But for this forecast, the ocean is taking a long nap. Don’t hold your breath. The next few weeks are for checking the buoys, waxing the board, and waiting.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun afternoon. Warm (max 28°C on Sun morning, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Thu afternoon, min 26°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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 13 | W 12 | W 12 | W 11 | W 11 | W 10 | W 10 | W 10 | W 11 | W 11 | WNW 13 | SSW 16 | NNE 5 | NNE 6 | W 12 | W 11 | W 12 | W 12 | WNW 11 | WNW 11 | WNW 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 28 | 25 | 23 | 21 | 21 | 19 | 8 | 8 | 23 | 22 | 33 | 0 | 34 | 0 | 11 | 10 | 25 | 12 | 24 | 24 | 34 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | glassy | cross-on | cross | glassy | cross-on | cross | glassy | on | cross | glassy | on | glassy | cross | cross-on | cross-on | cross | cross-on | cross-on | cross |
High Tide | 1:56PM0.86m | 1:52AM0.32m | 2:42PM0.90m | 2:44AM0.37m | 3:22PM0.91m | 3:31AM0.43m | 4:00PM0.88m | 4:16AM0.49m | 4:34PM0.83m | 5:00AM0.54m | 5:06PM0.76m | 5:44AM0.58m | 5:36PM0.67m | ||||||||
Low Tide | 9:17PM0.14m | 7:17AM0.03m | 9:48PM0.11m | 8:12AM0.02m | 10:18PM0.09m | 9:03AM0.02m | 10:47PM0.07m | 9:51AM0.05m | 11:15PM0.07m | 10:38AM0.10m | 11:41PM0.07m | 11:27AM0.17m | 00:06AM0.08m | ||||||||
 |  |  |  | | | | |  | | | | | | | | | | | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 6:55 | — | — | 6:54 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | 1 | 2 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 27 | 27 | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 30 | 31 | 30 | 30 | 31 | 30 | 31 | 30 | 29 | 30 | 31 | 30 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 6 | NE 8 | NE 7 | NE 6 | NE 5 | NE 6 | NE 6 | NE 5 | NE 5 | NNE 6 | NE 5 | SSW 16 | NNE 6 | SSW 14 | NNE 7 | SSW 14 | SSW 14 | ENE 10 | ENE 11 | NNE 8 |
| kJ | 46 | 61 | 65 | 44 | 46 | 30 | 33 | 46 | 20 | 20 | 39 | 30 | 48 | 39 | 70 | 62 | 40 | 36 | 63 | 73 | 145 |
Swell 2 Height (m) Direction Period (s) | W 13 | W 12 | W 12 | W 11 | SSW 15 | W 10 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | WNW 12 | SSW 15 | W 12 | SSW 14 | W 12 | W 12 | SSW 13 | WNW 11 | ENE 13 |
| kJ | 28 | 25 | 23 | 21 | 47 | 19 | 41 | 40 | 35 | 32 | 32 | 32 | 28 | 44 | 11 | 69 | 25 | 11 | 35 | 24 | 212 |
Swell 3 Height (m) Direction Period (s) | NE 9 | SSW 12 | SSW 12 | SSW 12 | W 11 | SSW 15 | W 10 | W 10 | W 11 | W 11 | WNW 13 | SSW 16 | SSW 12 | SSW 12 | S 18 | W 11 | SW 17 | SW 17 | WNW 11 | SSW 13 | WNW 13 |
| kJ | 13 | 15 | 14 | 14 | 21 | 23 | 8 | 8 | 23 | 22 | 33 | 51 | 28 | 28 | 6 | 10 | 12 | 12 | 24 | 34 | 34 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NNE 5 | — | NE 7 | NE 5 | NNE 7 | NNE 9 | NNE 7 | NNE 9 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 34 | — | 67 | 6 | 96 | 135 | 142 | 186 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 98 | 14 | 20 | 100 | 21 | 14 | 101 | 100 | 14 | 100 | 103 | 19 | 100 | 4 | 19 | 14 | 14 | 19 | 98 | 19 | 4 |
Best forecast wave conditions in Big Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Latest Updates
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kua Bay surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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.
Nearest