
Surf Forecasts:
Sixtynine surf forecast from 8 Aug 2026:
- Most powerful swell: Wednesday 12 Aug, 5PM (local time) - 1ft (0.3m), 13s period, WNW swell with 33 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 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 7s period and expected on Friday (Aug 14) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Wed 12th Aug) | 1ft (0.3m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
G’day, it’s Rusty here. Let’s be straight with you: this 16-day window is a tough one. The swell is tiny, the energy is mostly weak, and we’ve got a long stretch of flatness before anything even raises a pulse. Don’t get too excited yet, but there’s a glimmer of something rideable late in the piece.
We’re looking at a run of poor surf from now through the 17th. It’s small, weak, and mostly blown out or just plain gutless. On the 8th and 9th, we’ve got nothing but ripples and crossed-up junk. The 9th afternoon does go glassy with a whisper of west swell at 1ft, but it’s still a shadow. The 10th and 11th are similar – glassy windows but the swell is barely there, with energy readings in the single digits to low 20s (8 to 21). It’s the kind of stuff that has you sitting on the sand watching for ten minutes before you even bother waxing up.
From the 12th through the 17th, the swell stays stuck around 0.7ft to 1ft, mostly west-northwest with periods in the 10 to 13 second range. The energy picks up a touch to the 20s and 30s (21 to 33), but it’s still marginal. The mornings are often crossed-up, and the afternoons are cleaner but with hardly any push. The 13th and 17th have moderate cross-shore winds that are going to chop up what little shape there is. Honestly, if you’re a kite surfer, some of these afternoons with the cross-shore breeze and glassy patches might look more fun than trying to paddle a 1ft ripple.
The first real hint of something better shows up on Tuesday the 18th. The swell bumps to 1ft from the west-northwest, with a period stretching to 13–14 seconds. The energy jumps to 68–69, which is still weak-to-moderate, but it’s the most we’ve seen all week. The morning is onshore, but the afternoon goes glassy and the wave comment finally says “surfable waves.” It’s not firing, but it’s the first time you’d actually paddle out and catch a few.
The 19th and 20th keep that 1ft west-northwest swell, but the winds are onshore and the energy fades back to the 40s and 50s (40 to 58). It’s still poor, just less terrible. The 21st and 22nd bring a shift: the swell direction swings to the southwest, and the period jumps to 16 seconds. That’s a proper groundswell signal, but the size is still locked at 1ft. The energy sits in the 60s (59 to 69), which is moderate, but it’s a long-period swell hitting a beach break. That means it might break too straight and close out, and with the small size, it’s more of a promise than a payoff. The winds are light cross-onshore, so it won’t be clean, but it’s the most interesting swell direction of the whole window.
So, the standout – and I use that term loosely – is the afternoon of the 18th. That’s the one session where everything aligns just enough: 1ft from the west-northwest, 13-second period, glassy conditions. It’s not big, but it’s clean and it’s the only real window of surfable waves. The 21st and 22nd have more grunt in the period, but the direction is less ideal for this spot and the winds aren’t helping. That southwestern groundswell is promising if the size ever comes up, but it’s a long-range call and I wouldn’t book the day off work for it.
Bottom line: we’re in a flat spell. The consistent-but-tiny run from the 8th to the 17th is a grind, and the 18th is your best bet for a paddle. After that, it’s waiting on that southwest energy to fill in, but that’s a call for next week. Stay patient, keep the board waxed, and check back in.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 29°C on Sat morning, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 11 | SSW 18 | SSW 18 | NE 6 | W 13 | W 12 | W 12 | W 11 | W 11 | W 10 | W 10 | W 10 | W 11 | W 11 | WNW 13 | SSW 16 | W 12 | W 12 | W 12 |
Wave Graph | |||||||||||||||||||
0 | 0 | 0 | 0 | 28 | 25 | 23 | 21 | 21 | 18 | 8 | 8 | 23 | 21 | 33 | 0 | 25 | 25 | 11 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross-on | glassy | glassy | cross-on | glassy | cross-off | cross-on | glassy | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off |
High Tide | 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 | 4:52PM0.76m | |||||||
Low Tide | 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 | 10:03AM-0.03m | 11:35PM-0.01m | ||||||
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
6:57 | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | |
mm | — | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 25 | 28 | 28 | 26 | 29 | 29 | 27 |
Feels °C | 30 | 31 | 30 | 30 | 32 | 33 | 31 | 31 | 32 | 30 | 31 | 31 | 26 | 29 | 28 | 28 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 5 | NE 5 | NE 10 | NE 6 | NE 7 | NE 6 | NNE 7 | NNE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 7 | SSW 13 | NNE 6 | NE 6 | NNE 6 | SSW 15 | SSW 15 |
21 | 21 | 15 | 32 | 49 | 47 | 35 | 28 | 59 | 31 | 33 | 49 | 11 | 32 | 39 | 33 | 61 | 44 | 71 | |
Swell 2 Height (m) Direction Period (s) | NE 11 | NE 10 | ENE 7 | SSW 18 | W 13 | W 12 | NE 6 | NE 7 | SSW 16 | W 10 | SSW 14 | SSW 14 | SSW 13 | S 18 | SSW 13 | SSW 16 | SSW 16 | SSW 12 | W 12 |
18 | 16 | 5 | 30 | 28 | 25 | 11 | 25 | 47 | 18 | 41 | 40 | 35 | 56 | 32 | 51 | 48 | 14 | 11 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 18 | SSW 18 | NE 9 | NE 9 | SSW 12 | W 12 | W 11 | W 11 | SSW 15 | W 10 | W 10 | W 11 | W 11 | WNW 13 | SSW 13 | W 12 | W 12 | S 18 |
17 | 32 | 31 | 13 | 13 | 15 | 23 | 21 | 21 | 23 | 8 | 8 | 23 | 21 | 33 | 32 | 25 | 25 | 6 | |
Wind waves Height (m) Direction Period (s) | — | — | NE 5 | — | — | — | — | — | — | — | — | — | NNE 4 | NE 5 | — | — | — | NNE 6 | NE 6 |
— | — | 28 | — | — | — | — | — | — | — | — | — | 8 | 27 | — | — | — | 63 | 88 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 42 | 94 | 44 | 29 | 84 | 84 | 38 | 94 | 41 | 38 | 88 | 57 | 38 | 92 | 94 | 29 | 94 | 25 | 29 |
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.











