Surf Forecasts:
Kua Bay surf forecast from 4 Sep 2026:
- Best quality surf: Monday 7 Sep, 8AM (local time) - 5.5ft (1.7m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 8PM (local time) - 10ft (3.0m), 14s period, SW swell with 3,264 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 11PM (local time) - 4.5ft (1.4m), 13s 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 Sunday (Sep 06) at 11PM. The primary swell is predicted to be 1.4m and 13s period. 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 3.0m 14s and forecast to arrive on Monday (Sep 07) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 13s period and expected on Sunday (Sep 06) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 6th Sep) | 4.5ft (1.4m) 13s |
| Best Surf | 8AM (Mon 7th Sep) | 5.5ft (1.7m) 14s |
| Most Powerful | 8PM (Mon 7th Sep) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Kua Bay over the next 16 days.
The Lowdown
Alright, let’s talk shop about Kua Bay. Gotta be honest, the first few days are a total flat spell. The water’s about 28°, which is a touch warmer than usual for this time of year—feels like a bathtub, but nothin’ crazy. The first real glimmer of surf won’t come until Monday, September 7th, so we’re lookin’ at a four-day dry spell.
So, Monday morning on the 7th, we get a little pulse: 1.9m from the SW with a long 14-second period, and solid energy (1459). The wind is a light cross-onshore, so it’s a bit bumpy but rideable. But the real show is Monday afternoon. The wind swings to a clean cross-offshore at 25 km/h, and the swell jumps to a beefy 3.0m from the SW with a very long 14-second period (combined energy of 3956). That’s a lot of power. For a spot like Kua Bay, that long period will give you some proper waves. But 3.0m is big—this is expert territory only. The direction is a good match for the break’s optimum, so it’ll wrap in sweet. And since crowds are a “sometimes” thing, you’ll have a few friends out there.
Tuesday the 8th morning still has a decent 1.5m from the W with a 10-second period (449 energy) and clean cross-offshore wind. That’s a nice, manageable size for more folks. After that, it’s downhill. The rest of the 16 days is mostly flat, tiny, or poor—just a few weak, long-period ghost swells that won’t do much.
The top pick is Monday afternoon, September 7th. It’s the biggest, cleanest, and most powerful swell of the whole run. If you’re an expert, that’s the session to chase. Tuesday morning is a good second choice for a slightly easier ride.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Thu morning, min 25°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun night. Warm (max 29°C on Mon afternoon, min 26°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | |||||||||||||||
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 9 | W 9 | SSW 13 | NE 6 | S 12 | SSW 11 | SSW 12 | SSW 12 | SSW 12 | SW 12 | SW 13 | SW 13 | SW 14 | SW 14 | WSW 11 | W 10 | WNW 8 | SSW 14 | NE 5 | NE 7 | NE 6 |
Wave Graph  | |||||||||||||||||||||
 kJ | 2 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 683 | 1236 | 2708 | 1204 | 377 | 94 | 0 | 22 | 0 | 0 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross | glassy | glassy | glassy | cross-on | cross | cross-on | cross-on | glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off | on | cross-on | cross-off | cross |
High Tide | 8:58AM0.68m | 6:59PM0.32m | 10:26AM0.70m | 9:25PM0.26m | 11:46AM0.74m | 11:54PM0.28m | 12:47PM0.78m | 1:07AM0.33m | 1:36PM0.81m | 1:57AM0.40m | 2:18PM0.82m | 2:40AM0.48m | 2:55PM0.80m | 3:19AM0.56m | |||||||
Low Tide | 5:04PM0.31m | 1:54AM0.12m | 7:14PM0.25m | 3:19AM0.14m | 7:46PM0.20m | 4:58AM0.14m | 8:14PM0.15m | 6:18AM0.11m | 8:41PM0.12m | 7:21AM0.09m | 9:06PM0.09m | 8:14AM0.08m | 9:31PM0.07m | ||||||||
 | |  |  | | | | |  | | |  | | | | |  | | | | | |
 | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | 1 | — | — | 2 | — |
Temp °C | 29 | 29 | 27 | 28 | 27 | 26 | 28 | 27 | 26 | 28 | 27 | 27 | 28 | 29 | 28 | 29 | 29 | 27 | 27 | 28 | 27 |
Feels °C | 32 | 32 | 31 | 31 | 31 | 30 | 31 | 29 | 30 | 31 | 29 | 31 | 30 | 32 | 28 | 30 | 31 | 32 | 32 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NE 6 | NE 6 | NNE 6 | NNE 6 | NNE 7 | NNE 6 | SSW 12 | SW 12 | SW 13 | SW 13 | SW 14 | SW 14 | WSW 11 | W 10 | WNW 8 | NE 8 | NE 8 | SW 8 | NE 6 |
| kJ | 71 | 88 | 35 | 51 | 63 | 27 | 38 | 46 | 251 | 386 | 488 | 683 | 1236 | 2708 | 1204 | 377 | 94 | 45 | 20 | 15 | 46 |
Swell 2 Height (m) Direction Period (s) | S 14 | S 14 | SSW 13 | S 12 | S 12 | SSW 11 | SSW 12 | SSW 12 | NE 13 | NNE 6 | NE 12 | NE 12 | ENE 12 | NE 12 | NE 11 | SW 9 | SW 8 | SW 8 | SW 8 | SSW 13 | SSW 13 |
| kJ | 16 | 16 | 58 | 43 | 77 | 74 | 119 | 177 | 239 | 36 | 286 | 216 | 167 | 205 | 177 | 129 | 55 | 32 | 15 | 34 | 17 |
Swell 3 Height (m) Direction Period (s) | W 9 | W 9 | ENE 8 | SSW 13 | E 14 | ENE 14 | ENE 14 | ENE 13 | NNE 9 | ENE 12 | SSW 18 | NNE 10 | N 7 | SSW 16 | SSW 15 | NE 9 | WSW 8 | SSW 14 | SSW 14 | E 13 | SSW 8 |
| kJ | 2 | 2 | 6 | 35 | 16 | 37 | 65 | 59 | 17 | 83 | 31 | 32 | 24 | 85 | 77 | 67 | 33 | 79 | 38 | 13 | 6 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 5 | NE 7 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 22 | 102 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 100 | 4 | 19 | 100 | 14 | 30 | 30 | 30 | 14 | 30 | 28 | 0 | 30 | 10 | 17 | 51 | 0 | 20 | 101 | 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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