
Surf Forecasts:
Sixtynine surf forecast from 7 Aug 2026:
- Most powerful swell: Wednesday 12 Aug, 5AM (local time) - 1ft (0.3m), 13s period, W swell with 30 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 Wednesday (Aug 12) 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 0.9m 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 | 5AM (Wed 12th Aug) | 1ft (0.3m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what’s on offer at Sixtynine over the next couple of weeks.
Right off the bat, I gotta be straight with you – this is a tough run. The first ten days or so are looking pretty average, with hardly any push to get excited about. We’re talking tiny dribbles of swell, mostly around 0.7ft to 1ft, with a 12 to 13 second period on that W swell. The combined energy is weak, barely getting into double digits (12), so it’s all pretty limp. The water temp is sitting at 81°, which is about average for this time of year, so nothing unusual there.
The first real glimmer of hope doesn’t show up until Saturday the 16th of August. By the afternoon, we finally get a bit of a pulse. The swell bumps up to 1ft from the WNW, with a 12-second period, and the combined energy climbs to 92. It’s still not big, but the wind goes glassy – dead calm – so the conditions will be clean. It’s surfable, but very ordinary. You’ll be fighting for any little crumb you can get.
Now, the standout in this whole outlook lands on Thursday the 20th of August. This is where it gets interesting. The swell direction swings around to the SW, and the period jumps to a very long 21 seconds. That’s a proper groundswell pulse. The combined energy hits 158 (moderate), and the swell height is still only 1ft, but that long period means it’ll have some shape and push, especially around the point. The wind goes glassy in the afternoon, flat calm. This is a rare, promising window for the patient surfer. Because Sixtynine is a fairly exposed spot and the optimum swell direction is WNW, this SW swell is a bit off-angle, but that long period groundswell can still wrap in nicely. Remember, though, long-period swells like this can break a bit straight on a beach break, so keep your eyes open for the right line.
From the 21st, it fades back to small, weak, and unremarkable again. The crowds at Sixtynine are listed as "sometimes," so you might have company on that Thursday glass-off, but it’s not a zoo.
So, bottom line: don’t hold your breath for the first week and a half. The best bet is the Thursday the 20th of August, with that glassy, long-period SW groundswell. It’s a long way out, so keep checking in, but it’s the only real spark in the whole 16-day window.
- Rusty
Short Range ForecastMostly dry. Warm (max 29°C on Sun morning, min 24°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Sun afternoon. Warm (max 29°C on Sun afternoon, min 25°C on Sun night). Wind will be generally light. | |||||||||||||||||||
Thu 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | ||||||||||||||
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 12 | W 12 | W 12 | W 12 | NE 11 | SSW 18 | NNE 6 | NE 6 | W 13 | W 12 | W 12 | W 11 | W 11 | W 10 | W 10 | W 10 | W 13 | S 18 | W 13 | SSW 16 |
Wave Graph | ||||||||||||||||||||
12 | 11 | 11 | 11 | 0 | 0 | 0 | 0 | 28 | 25 | 23 | 21 | 21 | 19 | 8 | 8 | 29 | 0 | 30 | 0 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | glassy | cross-off | cross-on | cross-off | cross-off | cross-on | glassy | glassy | on | cross-on | cross-off | cross-on | glassy | cross-off | cross-on | cross | cross-off |
High Tide | 9:29PM0.23m | 12:16PM0.69m | 11:28PM0.19m | 1:16PM0.76m | 1:00AM0.19m | 2:08PM0.80m | 2:05AM0.23m | 2:55PM0.83m | 2:57AM0.27m | 3:37PM0.84m | 3:45AM0.33m | 4:16PM0.81m | 4:30AM0.38m | |||||||
Low Tide | 6:57PM0.22m | 4:04AM-0.01m | 8:13PM0.15m | 5:14AM-0.02m | 8:57PM0.09m | 6:24AM-0.04m | 9:32PM0.05m | 7:27AM-0.07m | 10:05PM0.02m | 8:23AM-0.08m | 10:36PM0.00m | 9:15AM-0.06m | 11:06PM-0.01m | |||||||
— | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | 2 | — | — | 1 | — | — | — | — | — | — | — |
Temp °C | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 29 | 28 | 27 | 29 | 29 | 26 | 29 | 29 | 26 |
Feels °C | 31 | 29 | 30 | 31 | 30 | 30 | 30 | 30 | 33 | 33 | 31 | 32 | 31 | 31 | 31 | 32 | 30 | 30 | 31 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 5 | SSW 14 | NE 4 | NE 6 | NNE 5 | NE 6 | NE 7 | NE 6 | NE 6 | NE 7 | NNE 5 | NE 7 | NE 6 | NE 7 | NE 6 | NE 6 | NNE 5 | NE 5 | NE 6 | NNE 5 |
22 | 20 | 9 | 36 | 17 | 24 | 12 | 47 | 49 | 75 | 15 | 52 | 59 | 46 | 39 | 56 | 22 | 19 | 39 | 15 | |
Swell 2 Height (m) Direction Period (s) | NE 8 | ENE 8 | W 12 | NE 7 | NE 11 | NE 10 | NE 10 | SSW 18 | W 13 | W 12 | NE 7 | W 11 | SSW 15 | W 10 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 16 |
9 | 6 | 11 | 12 | 18 | 15 | 14 | 30 | 28 | 25 | 26 | 21 | 47 | 19 | 40 | 39 | 35 | 32 | 32 | 51 | |
Swell 3 Height (m) Direction Period (s) | W 12 | W 12 | SSW 14 | W 12 | SSW 13 | SSW 18 | SSW 18 | SSW 13 | NE 9 | SSW 12 | W 12 | SSW 12 | W 11 | SSW 15 | W 10 | W 10 | W 13 | S 18 | W 13 | SSW 13 |
12 | 11 | 18 | 11 | 17 | 32 | 31 | 17 | 13 | 15 | 23 | 14 | 21 | 23 | 8 | 8 | 29 | 56 | 30 | 32 | |
Wind waves Height (m) Direction Period (s) | — | NNE 4 | — | — | — | — | NNE 6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | 13 | — | — | — | — | 40 | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 88 | 38 | 88 | 88 | 38 | 97 | 38 | 29 | 84 | 57 | 38 | 84 | 41 | 38 | 97 | 88 | 38 | 94 | 57 | 41 |
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.











