
Surf Forecasts:
Sixtynine surf forecast from 8 Aug 2026:
- Most powerful swell: Wednesday 12 Aug, 5PM (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 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Friday (Aug 14) at 11AM.
| 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, Rusty here. Let’s be straight up: this Sixtynine stretch is looking pretty flat and quiet for the next couple of weeks. There’s a long gap with no real surf to speak of, so don’t get your hopes up too early.
Right now, through the first week of August, the ocean is offering next to nothing. We’re looking at tiny dribbles of swell – maybe 0.7 ft to 1 ft from the west, with periods hanging around 10 to 13 seconds. The combined energy is weak, barely cracking 20 to 30 (11 to 30 range). The wind is light and often glassy, which would be beautiful if there was any wave to ride, but there isn’t. It’s just poor surf conditions day after day.
Come Monday the 12th of August, still the same story – small west swell, 1 ft at best, with periods around 11 to 13 seconds, but energy stays low (22 to 30). Winds are light and variable, sometimes cross or glassy, but it’s not enough to get excited about. The water temperature is sitting around 81° with a small anomaly, so pretty average for this time of year.
The gap stretches on through the middle of the month. No real swell builds. The combined energy hovers in the teens to mid-30s, and the “poor surf conditions” tag keeps showing up. It’s a blank run, plain and simple.
Finally, late in the second week, there’s a little flicker. On Monday the 17th of August, the afternoon shows a 1 ft west-northwest swell with a period of 16 seconds. That’s a long period groundswell, and the combined energy bumps up to 77. The wind is light and cross-off from the northeast, so the surface is clean. It’s still tiny, but it’s the best of a bad bunch. The period is long enough that it should offer some shape, but at this size, it’s more of a longboard special at Sixtynine.
By Tuesday the 18th of August, the swell nudges up to 1 ft from the west-northwest, with a period of 14 seconds and energy hitting 87. Still very small, but the wind is light and cross-on from the north-northwest, so it’s rideable if you’re desperate. After that, things fade again, with energy dropping back to 40s and 50s through the rest of the week.
The standout, if you can call it that, is the Monday 17th of August afternoon session. That 1 ft, 16-second groundswell with clean offshore breezes is the only window where you might actually get a half-decent wave. It’s not big, it’s not powerful, but it’s the closest thing to surf we’ve got.
Honestly, this is a tough outlook. The consistency is there in the sense that small swell keeps showing, but the quality is just not there. It’s one of those periods where the ocean is taking a nap. Keep an eye on the forecasts, because things can change, but for now, I’d be looking at other hobbies for a few weeks.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 29°C on Fri afternoon, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Mon afternoon, min 24°C on Tue night). Wind will be generally light. | |||||||||||||||||||
Fri 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 | NE 11 | NE 10 | NE 5 | NNE 6 | W 13 | W 12 | W 12 | W 11 | W 11 | W 10 | W 12 | W 10 | W 13 | W 11 | W 13 | SSW 16 | W 12 | W 12 | W 12 |
Wave Graph | ||||||||||||||||||||
11 | 0 | 0 | 0 | 0 | 28 | 25 | 23 | 21 | 21 | 19 | 12 | 8 | 29 | 22 | 30 | 0 | 25 | 25 | 11 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | cross-on | cross-off | cross-off | cross-on | glassy | glassy | on | glassy | cross-off | cross | glassy | cross-off | cross | cross | cross-off | cross | cross | 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 | 29 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 29 | 26 | 29 | 29 | 26 | 28 | 29 | 27 |
Feels °C | 32 | 29 | 30 | 30 | 30 | 32 | 32 | 31 | 31 | 32 | 30 | 30 | 31 | 28 | 29 | 30 | 28 | 29 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | NE 5 | NE 5 | NNE 5 | NE 10 | NNE 6 | NE 5 | NE 6 | NE 7 | NE 6 | NE 7 | NE 6 | SSW 14 | NNE 6 | NNE 5 | SSW 13 | NE 6 | NE 6 | NNE 6 | SSW 15 | NNE 6 |
22 | 21 | 16 | 15 | 27 | 29 | 44 | 46 | 37 | 63 | 31 | 41 | 59 | 22 | 32 | 46 | 34 | 41 | 44 | 43 | |
Swell 2 Height (m) Direction Period (s) | W 12 | NE 11 | NE 10 | SSW 18 | NE 7 | W 13 | W 12 | W 12 | W 11 | SSW 15 | W 10 | W 10 | SSW 14 | SSW 13 | NE 6 | SSW 13 | SSW 16 | SSW 16 | W 12 | SSW 15 |
11 | 18 | 25 | 31 | 18 | 28 | 25 | 23 | 21 | 47 | 19 | 8 | 40 | 35 | 6 | 32 | 51 | 48 | 25 | 71 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 18 | SSW 13 | SSW 18 | NE 9 | NE 9 | SSW 12 | NE 8 | W 11 | SSW 15 | W 12 | W 10 | W 13 | W 11 | W 13 | SSW 13 | W 12 | SSW 12 | W 12 |
18 | 17 | 32 | 17 | 30 | 13 | 12 | 14 | 11 | 21 | 23 | 12 | 8 | 29 | 22 | 30 | 32 | 25 | 14 | 11 | |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 5 | — | — | — | — | — | — | — | NE 6 | — | — | NNE 5 | — | — | — | NNE 6 | — |
— | — | — | 32 | — | — | — | — | — | — | — | 45 | — | — | 17 | — | — | — | 63 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 88 | 38 | 88 | 38 | 29 | 88 | 88 | 38 | 94 | 94 | 38 | 88 | 97 | 75 | 38 | 97 | 41 | 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.











