
Surf Forecasts:
Kua Bay surf forecast from 10 Sep 2026:
- Most powerful swell: Wednesday 16 Sep, 2PM (local time) - 1.5ft (0.4m), 18s period, SW swell with 109 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 18s and forecast to arrive on Wednesday (Sep 16) 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 0.9m 7s period and expected on Thursday (Sep 10) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Wed 16th Sep) | 1.5ft (0.4m) 18s |
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. The next couple of weeks are looking pretty flat and quiet for Kua Bay. We’ve got a long stretch of nothing but small, weak swell and poor conditions, so if you’re chasing waves, you’re going to need some patience.
The first real highlight doesn't show up until Friday, September 18th. Before that, it's a wasteland of tiny, short-period leftovers and crummy winds. A few mornings have a little bump, but nothing worth paddling out for. We’re talking a solid week or more of knee-high dribble. You might get lucky on a glassy afternoon, like Sunday the 13th, but the swell is just not there.
Then, on the morning of Friday the 18th, things finally wake up a little. We’ve got a 1ft southwest swell rolling in with a long 17-second period. It’s not big, but that long period means there’s some push behind it. The wind is light and glassy, which will make it feel cleaner than it has any right to be. The combined energy jumps up to 107, which is the most we’ve seen in this whole run. It’s still small, so it’s more of a longboard or funboard wave, but it’ll be the best we’ve got. Don't expect a circus, but it’s a genuine window to get wet.
After that little pulse, it fades back down to the same old story: tiny, weak, and mostly cross-shore. There’s another similar small pulse on the 24th and 25th, again with a long period from the southwest and west-northwest, but the energy is weaker. Honestly, for Kua Bay, these long-period swells from the southwest aren't ideal. They tend to wrap in and can get a little too lined up for this spot, so manage your expectations.
The water temp is about average for this time of year, so nothing to worry about there. It's just a quiet spell, plain and simple. Keep the board in the car, but don’t be surprised if it stays in the bag for most of the next two weeks.
Rusty
Short Range ForecastModerate rain (total 11mm), heaviest on Wed night. Warm (max 29°C on Thu morning, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Sat night. Warm (max 28°C on Mon morning, min 25°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | NE 7 | SW 16 | SW 18 | SW 10 | SW 10 | SW 9 | SW 9 | WSW 8 | SW 14 | SW 14 | NNE 9 | W 11 | W 11 | W 10 | W 10 | NNE 8 | WSW 9 | SW 19 | WSW 8 |
Wave Graph | |||||||||||||||||||
0 | 42 | 49 | 16 | 14 | 13 | 12 | 7 | 29 | 29 | 0 | 9 | 9 | 8 | 8 | 0 | 8 | 0 | 7 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross-on | cross | cross | cross-on | glassy | glassy | on | cross-off | glassy | cross-on | cross-on | glassy |
High Tide | 3:19AM0.56m | 3:28PM0.76m | 3:57AM0.62m | 4:00PM0.70m | 4:35AM0.67m | 4:29PM0.63m | 5:12AM0.70m | 4:56PM0.55m | 5:50AM0.70m | 5:21PM0.47m | 6:31AM0.69m | 5:43PM0.41m | |||||||
Low Tide | 9:31PM0.07m | 9:04AM0.09m | 9:55PM0.06m | 9:51AM0.11m | 10:19PM0.05m | 10:36AM0.14m | 10:41PM0.06m | 11:23AM0.19m | 11:04PM0.07m | 12:12PM0.23m | 11:26PM0.09m | 1:09PM0.27m | 11:50PM0.11m | ||||||
— | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | |
6:31 | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | |
mm | 3 | — | 2 | 4 | — | 1 | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 28 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 32 | 33 | 31 | 30 | 30 | 29 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 31 | 32 | 31 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NE 7 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 9 | NNE 9 | NNE 9 | NNE 9 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 7 | NNE 7 |
49 | 59 | 65 | 13 | 37 | 51 | 37 | 44 | 68 | 86 | 67 | 49 | 62 | 61 | 59 | 54 | 37 | 21 | 37 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SW 16 | SW 18 | SW 16 | ENE 11 | SW 15 | SW 15 | SW 14 | NE 4 | SW 14 | SSW 12 | SSW 15 | SSW 14 | SW 14 | SSW 22 | SSW 21 | SW 20 | NNE 4 | SW 19 |
33 | 42 | 49 | 67 | 24 | 57 | 57 | 49 | 5 | 29 | 15 | 21 | 20 | 7 | 46 | 45 | 98 | 7 | 94 | |
Swell 3 Height (m) Direction Period (s) | SSW 7 | SSW 13 | SSW 13 | SW 10 | SW 10 | SW 9 | SW 9 | WSW 8 | SW 14 | WNW 11 | SSW 15 | W 11 | W 11 | W 10 | W 10 | SSW 13 | WSW 9 | SW 19 | WSW 8 |
5 | 16 | 16 | 16 | 14 | 13 | 12 | 7 | 29 | 12 | 22 | 9 | 9 | 8 | 8 | 17 | 8 | 96 | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 4 | — | — | — | — | — | — | — | NE 4 | — | — | — | — | — | — | — |
— | — | — | 8 | — | — | — | — | — | — | — | 4 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 20 | 4 | 26 | 4 | 98 | 30 | 30 | 26 | 100 | 96 | 98 | 100 | 14 | 98 | 98 | 14 | 32 | 30 | 14 |
Best forecast wave conditions in Big Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Live Wave Height (m)
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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.










