Surf Forecasts:
Kua Bay surf forecast from 25 Aug 2026:
- Most powerful swell: Sunday 30 Aug, 5AM (local time) - 1ft (0.3m), 16s period, SW swell with 43 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 0.3m 16s and forecast to arrive on Sunday (Aug 30) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 8s period and expected on Monday (Aug 31) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sun 30th Aug) | 1ft (0.3m) 16s |
Table - best surf conditions forecast for Kua Bay over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s cooking for Kua Bay.
Truth be told, the next two weeks are looking pretty flat. There’s a long stretch of quiet water ahead. The first real chance of anything worth paddling out for doesn’t show up until late in the window. From now through most of August and into the first week of September, you’re looking at a whole lot of nothing—days on end with no surf to speak of, just glassy mornings and light breezes. It’s a proper lull.
There’s a tiny blip on the 30th of August with a 0.7 ft swell from the W, 12 second period, but it’s barely a ripple. Then on the 31st of August, the morning shows a 1.0 ft swell from the SW with a very long 15 second period, and the combined swell energy is just 42 (weak). That’s not enough to get excited about. The wind is light cross-onshore, so it’s not clean. Still poor.
The best of a quiet bunch shows up on the 8th of September, Tuesday afternoon. We finally see some swell push through: 1 ft from the NW with a 16 second period, and the combined swell energy hits 112 (moderate). That’s the most energy we’ve seen in the whole forecast. Wind goes glassy, and conditions turn clean. Kua Bay (Hawaii) is fairly consistent, exposed to WNW swell, and the optimum direction is WNW, so this NW swell is a decent match. The water temperature is 82° and running a touch warmer than normal for this time of year.
Even then, the swell size is small, so only a longboard or a funboard is going to get you going. This is the standout, but it’s still a small wave day. Crowds are possible here. If you’re hanging out for a wave, that 8th of September afternoon is your best bet.
Otherwise, it’s a long blank run. Kua Bay can go quiet like this, so it’s not unusual. Keep an eye on the forecasts—things can change.
- Rusty
Short Range ForecastModerate rain (total 10mm), heaviest on Tue night. Warm (max 29°C on Mon morning, min 25°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 27°C on Thu morning, min 25°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
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 12 | NW 11 | NW 10 | NE 6 | NE 6 | NE 5 | NNE 5 | NE 6 | NNE 5 | W 10 | SSW 15 | NNE 5 | SSW 14 | NE 6 | W 10 | SSW 13 | NE 6 | NNE 6 | W 12 | NNE 7 | SW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 13 | 5 | 4 | 0 | 0 | 25 | 0 | 0 | 17 | 8 | 0 | 16 | 0 | 0 | 7 | 0 | 0 | 0 | 11 | 0 | 35 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | glassy | glassy | cross | glassy | glassy | cross | cross | cross-on | cross-off | glassy | cross | cross-on | glassy | cross-on | glassy | glassy | cross-on | cross | glassy |
High Tide | 2:15PM0.76m | 2:16AM0.36m | 2:46PM0.78m | 2:51AM0.41m | 3:15PM0.79m | 3:25AM0.47m | 3:42PM0.78m | 4:00AM0.52m | 4:09PM0.75m | 4:36AM0.58m | 4:36PM0.69m | 5:14AM0.62m | 5:03PM0.63m | ||||||||
Low Tide | 9:20PM0.16m | 7:39AM0.10m | 9:39PM0.14m | 8:20AM0.08m | 9:58PM0.11m | 9:00AM0.08m | 10:18PM0.10m | 9:40AM0.10m | 10:39PM0.08m | 10:22AM0.13m | 11:01PM0.07m | 11:07AM0.17m | 11:24PM0.06m | ||||||||
 |  |  |  | | | | |  | | |  | | | | | | | | |  | |
 | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:40 | — |
mm | — | 2 | 3 | — | — | 5 | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 28 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 27 | 26 | 26 | 27 | 27 | 26 | 28 | 28 | 27 |
Feels °C | 32 | 32 | 32 | 31 | 32 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 29 | 28 | 30 | 30 | 31 | 30 | 30 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NE 7 | NE 6 | NE 6 | NE 6 | SSW 14 | NNE 5 | NE 6 | SSW 13 | NNE 5 | NE 5 | SSW 15 | NNE 5 | NE 6 | NNE 6 | NNE 5 | NE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 |
| kJ | 46 | 73 | 38 | 38 | 39 | 21 | 21 | 49 | 17 | 17 | 20 | 42 | 17 | 47 | 35 | 12 | 54 | 34 | 40 | 59 | 59 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 15 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | N 8 | NNE 7 | NNE 7 | SSW 13 | NE 6 | SSW 12 | SSW 17 | SSW 16 | SSW 15 | SW 15 |
| kJ | 18 | 35 | 32 | 30 | 14 | 14 | 21 | 27 | 25 | 48 | 44 | 5 | 11 | 10 | 34 | 14 | 15 | 27 | 25 | 22 | 35 |
Swell 3 Height (m) Direction Period (s) | WNW 12 | NW 11 | NW 10 | SSW 16 | SSW 16 | ENE 7 | SSW 11 | SSW 14 | W 10 | W 10 | SSW 12 | W 9 | SSW 14 | SSW 13 | W 10 | SSW 13 | E 13 | ENE 7 | W 12 | S 12 | W 11 |
| kJ | 13 | 5 | 4 | 25 | 24 | 5 | 12 | 18 | 8 | 8 | 14 | 7 | 39 | 18 | 7 | 16 | 13 | 5 | 11 | 11 | 9 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NE 5 | — | — | NNE 5 | — | — | NNE 5 | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 25 | — | — | 17 | — | — | 16 | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 100 | 24 | 100 | 14 | 112 | 100 | 14 | 100 | 14 | 100 | 19 | 14 | 100 | 103 | 19 | 100 | 100 | 4 | 98 | 4 | 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.
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