Surf Forecasts:
Sixtynine surf forecast from 4 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 8AM (local time) - 1ft (0.3m), 13s period, W swell with 29 kJ wave energy.
Best Forecast Surf Conditions for Sixtynine this week:
The most powerful waves expected at Sixtynine in the next 16 days are 0.3m 13s and forecast to arrive on Sunday (Aug 09) at 8AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 6s period and expected on Saturday (Aug 08) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 9th Aug) | 1ft (0.3m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here. Let's have a look at what's on the table for this stretch.
Well, to be honest, it’s a slow start. We’re looking at a real flat spell for the first week and a half. From Tuesday, August 4th, right through to the morning of Wednesday, August 12th, it’s pretty much a write-off. Tiny little ankle-snappers, if anything at all, with most of the energy reading zero. You’d be better off staying home and waxing your board for this week.
The first real glimmer of something rideable shows up Thursday morning, August 13th, at Sixtynine. It’s not much, but we go from nothing to a 2ft west swell at 16 seconds. That’s a long-period groundswell, which means it’ll have some push, but for a beach break, it can get a bit straight. The combined energy finally climbs into the moderate range (255), and the wind is glassy. It’s surfable, but it’s very ordinary. The water temp is about average for this time of year.
Now, the standout window is the weekend of August 15th and 16th. The real pick of the bunch is Saturday morning, August 15th. We’ve got a 3ft swell rolling in from the WNW, which is bang on the optimum direction for Sixtynine. The period is a solid 16 seconds, so it’s a proper groundswell with plenty of shape. The combined energy is strong (348), and the wind is glassy – dead calm. That’s the magic combo: clean, glassy conditions with a decent, long-period groundswell. It’s an intermediate spot, so it’s not too big for the average surfer, and it’s fairly exposed, so it’ll soak up that swell. Just a heads up, it can get a crowd sometimes, so get in early.
Friday afternoon, August 14th, also looks promising with a 3ft WNW swell and clean, cross-off winds. That’s a solid runner-up, but that Saturday morning glass-off is the one to circle.
After that, the swell drops off again into the following week. The energy fades back to weak numbers, and the winds get a bit stronger, turning it into a bit of a chop fest. Tuesday afternoon, August 18th, has a little 2ft west swell with glassy conditions, but it’s very ordinary.
So, for the whole 16-day window, the call is simple: wait for the morning of Saturday, August 15th. That’s your best chance for a clean, rewarding session at Sixtynine.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 29°C on Fri afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 12 | ENE 11 | W 11 | W 13 | W 13 | W 12 | W 12 | W 12 | W 12 | SSW 14 | W 12 | W 12 | SSW 19 | SSW 18 | NE 6 | W 13 | W 12 | W 12 | W 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 11 | 0 | 10 | 12 | 28 | 11 | 11 | 11 | 12 | 0 | 11 | 11 | 0 | 0 | 0 | 13 | 28 | 25 | 22 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | glassy | glassy | cross-on | on | glassy | on | glassy | cross-off | cross-on | glassy | cross-off | cross-on | cross-off | glassy | on | glassy | glassy |
High Tide | 8:43AM0.52m | 7:30PM0.41m | 9:54AM0.57m | 8:12PM0.32m | 11:08AM0.63m | 9:29PM0.23m | 12:16PM0.69m | 11:28PM0.19m | 1:16PM0.76m | 1:00AM0.19m | 2:08PM0.80m | 2:05AM0.23m | |||||||
Low Tide | 1:44AM-0.00m | 2:34PM0.25m | 2:20AM-0.00m | 4:37PM0.27m | 3:05AM-0.01m | 6:57PM0.22m | 4:04AM-0.01m | 8:13PM0.15m | 5:14AM-0.02m | 8:57PM0.09m | 6:24AM-0.04m | 9:32PM0.05m | |||||||
 |  |  | | | | | | |  | | | | | | | |  |  | |
 | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — |
 | 6:59 | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 1 |
Temp °C | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 28 | 29 | 26 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 30 | 31 | 30 | 30 | 30 | 30 | 30 | 31 | 29 | 29 | 31 | 29 | 30 | 30 | 31 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | ENE 11 | NNE 6 | NNE 5 | NNE 5 | NNE 4 | NE 5 | NE 5 | NE 5 | NNE 4 | NE 4 | NE 6 | NE 8 | NE 6 | NE 10 | NE 6 | NE 7 | NE 7 | NE 8 |
| kJ | 20 | 47 | 20 | 11 | 10 | 11 | 11 | 22 | 28 | 13 | 10 | 39 | 10 | 32 | 14 | 54 | 79 | 86 | 82 |
Swell 2 Height (m) Direction Period (s) | ENE 11 | NNE 6 | ENE 11 | ENE 10 | NE 9 | NE 9 | NE 8 | NE 8 | NE 8 | NE 7 | NE 10 | W 12 | SSW 13 | NE 10 | SSW 18 | SSW 18 | W 12 | W 12 | W 11 |
| kJ | 48 | 11 | 46 | 39 | 22 | 20 | 18 | 10 | 9 | 9 | 14 | 11 | 17 | 15 | 31 | 30 | 28 | 25 | 22 |
Swell 3 Height (m) Direction Period (s) | W 12 | NE 7 | W 11 | W 13 | W 13 | W 12 | W 12 | W 12 | W 12 | SSW 14 | W 12 | SSW 13 | SSW 19 | SSW 18 | SSW 13 | W 13 | SSW 16 | SSW 12 | SSW 12 |
| kJ | 11 | 7 | 10 | 12 | 28 | 11 | 11 | 11 | 12 | 20 | 11 | 18 | 37 | 32 | 17 | 13 | 26 | 15 | 14 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | NE 5 | — | NE 6 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | 23 | — | 49 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 31 | 88 | 46 | 76 | 88 | 88 | 41 | 58 | 39 | 38 | 88 | 88 | 57 | 88 | 38 | 29 | 94 | 29 | 38 |
Best forecast wave conditions in Big Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Sixtynine Surf forecast
The above surf forecast table for Sixtynine provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sixtynine can be found by selecting the local surf guide option on the grey menu. Our Sixtynine 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 (Sixtynine) 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 Sixtynine 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.
Sixtynine is 84 km (52 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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