Surf Forecasts:
Sixtynine surf forecast from 12 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 57 kJ wave energy.
Best Forecast Surf Conditions for Sixtynine this week:
The most powerful waves expected at Sixtynine in the next 16 days are 0.4m 13s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 8s period and expected on Sunday (Aug 16) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 1.5ft (0.4m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Sixtynine is serving up.
To be straight with you, this outlook is a tough one. We’ve got a long stretch of tiny, weak swell right through the first week and into the second. The wave energy barely gets off the ground, sitting at weak levels like 22 (Wednesday morning) and 33 (Wednesday afternoon). The combined swell energy doesn’t crack three digits for weeks. You’ll be staring at clean, glassy water but with nothing to ride for the most part. There’s a glimmer of hope late on the 19th and into the 20th and 21st, but even then it’s only "surfable waves but very ordinary conditions." That’s a major gap of almost no surf to get excited about.
The first real hint of something comes on Wednesday 19th August afternoon. The swell nudges up to 1ft from the WNW with a period of 12 seconds, and the wind goes glassy off the NW. The energy is still only 90 — weak. It’s surfable but ordinary. The next day, Thursday 20th August has a similar story: 1ft from the SW with a very long period of 18 seconds. That’s proper groundswell energy, but the height is tiny. The combined energy sits at 93, still weak. The wind is glassy in the afternoon. It’ll be clean but small and slow, best suited for a log or a longboard. Friday 21st keeps the same tiny SW groundswell with glassy conditions, energy at 94. A small window for a cruise.
The standout, if you can call it that, is the 20th and 21st of August. The swell is tiny (1ft) but that 16-18 second period means the waves that do show will have a bit of shape and won’t be choppy. Clean, glassy conditions in the afternoon on both days mean if you’re desperate for a saltwater fix, you might find a knee-high runner. Crowds at Sixtynine can be "sometimes" an issue, but with surf this small, I doubt you’ll have to fight for a wave.
Honestly, if you’re a beginner, the small stuff is fine, but for anyone looking for a proper wave, this is a lean run. It’s the kind of period where the setup looks more interesting for a kite than a paddle if the wind ever gets strong. Forecasts can change, so don’t write it off completely.
Stay patient.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Wed morning, min 25°C on Tue night). Winds increasing (light winds from the NNE on Wed night, fresh winds from the NE by Fri afternoon). | Days 5-7 Weather SummaryHeavy rain (total 74mm), heaviest during Sat afternoon. Warm (max 28°C on Sun morning, min 25°C on Sat night). Winds decreasing (gales from the NE on Sat afternoon, calm by Sun afternoon). | ||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | ||||||||||||||
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 11 | W 11 | WNW 13 | WNW 12 | WNW 12 | W 12 | W 12 | W 11 | W 12 | NNE 7 | W 14 | W 11 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 23 | 22 | 33 | 28 | 28 | 25 | 11 | 10 | 24 | 0 | 16 | 22 | 34 | 53 | 49 | 46 | 41 | 24 | 24 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross | cross | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | on | glassy | glassy | cross | cross | cross-off |
High Tide | 3:45AM0.33m | 4:16PM0.81m | 4:30AM0.38m | 4:52PM0.76m | 5:16AM0.44m | 5:25PM0.69m | 6:01AM0.48m | 5:56PM0.60m | 6:49AM0.51m | 6:24PM0.51m | 7:40AM0.53m | 6:51PM0.41m | |||||||
Low Tide | 10:36PM0.00m | 9:15AM-0.06m | 11:06PM-0.01m | 10:03AM-0.03m | 11:35PM-0.01m | 10:52AM0.02m | 00:02AM-0.01m | 11:41AM0.09m | 00:29AM0.00m | 12:35PM0.16m | 00:54AM0.02m | 1:40PM0.21m | 1:21AM0.04m | ||||||
 |  |  |  | | | | | |  |  |  |  | | |  | | | | |
 | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 6:53 | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — |
mm | — | — | — | — | — | — | — | — | — | 6 | 4 | 38 | 13 | 4 | 5 | 3 | — | 1 | — |
Temp °C | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 27 | 27 | 26 | 27 | 28 | 27 | 27 | 28 | 28 | 26 |
Feels °C | 28 | 29 | 28 | 28 | 28 | 27 | 27 | 28 | 28 | 26 | 26 | 20 | 30 | 31 | 31 | 31 | 31 | 33 | 28 |
Swell 1 Height (m) Direction Period (s) | NNE 5 | SSW 13 | NNE 5 | SSW 16 | SSW 16 | NNE 6 | SSW 14 | SSW 14 | NE 9 | NE 9 | SSW 13 | ENE 10 | WNW 13 | NE 8 | NE 8 | NE 8 | NE 7 | NE 6 | NNE 5 |
| kJ | 16 | 32 | 34 | 51 | 48 | 39 | 70 | 41 | 20 | 20 | 35 | 35 | 34 | 171 | 118 | 75 | 100 | 68 | 25 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | NE 7 | SSW 13 | WNW 12 | WNW 12 | SSW 15 | NE 8 | W 11 | SSW 14 | SSW 13 | W 11 | SSW 13 | SSW 13 | SSW 6 | SW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 |
| kJ | 35 | 7 | 32 | 28 | 28 | 44 | 15 | 10 | 40 | 35 | 9 | 34 | 17 | 54 | 18 | 46 | 41 | 24 | 24 |
Swell 3 Height (m) Direction Period (s) | W 11 | W 11 | WNW 13 | SSW 13 | SSW 12 | W 12 | W 12 | S 18 | W 12 | E 11 | W 14 | W 11 | SW 16 | WNW 13 | WNW 12 | SW 5 | S 12 | S 14 | NE 8 |
| kJ | 23 | 22 | 33 | 32 | 28 | 25 | 11 | 6 | 24 | 9 | 16 | 22 | 10 | 53 | 49 | 4 | 11 | 16 | 9 |
Wind waves Height (m) Direction Period (s) | — | NNE 5 | — | NE 5 | NNE 5 | — | NNE 5 | NE 7 | NNE 6 | NNE 7 | NE 6 | NE 8 | NE 8 | — | — | — | — | — | — |
| kJ | — | 14 | — | 29 | 32 | — | 34 | 69 | 49 | 68 | 341 | 262 | 737 | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 38 | 41 | 94 | 92 | 38 | 38 | 41 | 92 | 42 | 38 | 41 | 41 | 31 | 29 | 5 | 82 | 94 | 88 | 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.
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