
Surf Forecasts:
Sixtynine surf forecast from 11 Aug 2026:
- Best quality surf: Sunday 16 Aug, 8PM (local time) - 3ft (0.9m), 7s period, W swell with glassy winds.
- Most powerful swell: Sunday 16 Aug, 11AM (local time) - 7.5ft (2.3m), 6s period, SW swell with 363 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 8PM (local time) - 3ft (0.9m), 7s period with W swell.
Best Forecast Surf Conditions for Sixtynine this week:
The surf forecast for Sixtynine over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 16) at 8PM. The primary swell is predicted to be 1.2m and 5s period with a secondary swell of 0.9m and 7s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 2.3m 6s and forecast to arrive on Sunday (Aug 16) at 11AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 13s period and expected on Saturday (Aug 15) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 16th Aug) | 3ft (0.9m) 7s |
| Best Surf | 8PM (Sun 16th Aug) | 3ft (0.9m) 7s |
| Most Powerful | 11AM (Sun 16th Aug) | 7.5ft (2.3m) 6s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s be straight about this one – it’s a pretty bleak stretch ahead for Sixtynine. We’ve got small, weak swell and only a couple of fleeting moments that might get your hopes up, but nothing that’s going to get the heart racing.
The water is sitting at 81°, which is pretty much normal for this time of year, so at least you won’t need a thick wetsuit.
Monday afternoon the 10th kicks it off with a tiny 1 ft of west swell, period a slow 11 seconds. Combined energy is a weak 21, and with a light cross breeze, it’s going to be flat and bumpy. Honestly, that’s a no-go.
Tuesday the 11th is even worse – almost flat in the morning, and just a 1 ft ripple in the afternoon. The whole first week is a write-off. From the 10th right through to the morning of Saturday the 15th, it’s all tiny 0.7 ft to 1 ft waves with cross or cross-off winds. The energy readings are all below 34, so it’s really just a lake out there.
Saturday afternoon the 15th offers a tiny 1 ft at 11 seconds from the WNW, with a combined energy of 34. Still, it’s poor.
Now, here’s the only real stand-out in the whole 16-day window, but it comes with a major warning. Sunday the 16th morning sees a big jump: a 8 ft swell from the SW, but with a super short period of just 6 seconds. That’s a steep, choppy, close-out machine. Combined energy hits 414 (strong wave energy), but the wind is cross-on. This is big and ugly – expert-only territory if you’ve got a death wish and a board you don’t care about. The afternoon drops to 6 ft, still short period, and with a risk of thunderstorms. Honestly, this setup looks more interesting for kite surfing than paddle surfing.
After that, it’s back to tiny dribble for the rest of the forecast. A few glassy moments pop up on Monday the 17th afternoon and Tuesday the 18th afternoon, with 1 ft waves and light winds, but the energy is barely 52-66. You could get a longboard out and practice your cross-stepping, but don’t expect a real ride.
Later in the second week, around Thursday the 20th afternoon, there’s a weak 1 ft SW groundswell with a long 17-second period. Combined energy is 86 – still weak – but with light cross-offshore winds, it’ll be clean. It’s promising but less certain this far out. You’ll have long waits between sets, and you’ll be paddling for knee-high lumps.
Forget about the rest. It’s a long, flat run. Sixtynine is just not firing this window.
Stay patient, mate. Forecasts can change.
- Rusty
Short Range ForecastSome drizzle, heaviest during Mon afternoon. Warm (max 28°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 22mm), heaviest during Sat afternoon. Warm (max 29°C on Sun morning, min 25°C on Thu night). Mainly fresh winds. | |||||||||||||||||||
Mon 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | ||||||||||||||
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 11 | W 10 | SSW 14 | W 10 | W 11 | W 11 | WNW 13 | SSW 16 | WNW 12 | W 12 | W 12 | W 11 | W 12 | W 12 | W 11 | WNW 11 | WNW 13 | SW 6 | SSW 6 | WNW 12 |
Wave Graph | ||||||||||||||||||||
21 | 18 | 0 | 19 | 23 | 22 | 33 | 0 | 28 | 25 | 11 | 10 | 24 | 11 | 9 | 24 | 58 | 363 | 171 | 45 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-on | cross | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross | cross-off | cross-off | cross | cross | cross-on | cross-on | glassy |
High Tide | 2:55PM0.83m | 2:57AM0.27m | 3:37PM0.84m | 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 | |||||||
Low Tide | 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 | 10:52AM0.02m | 00:02AM-0.01m | 11:41AM0.09m | 00:29AM0.00m | 12:35PM0.16m | 00:54AM0.02m | |||||||
— | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | |
6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 12 | 9 | — | 3 | — |
Temp °C | 28 | 27 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 25 | 26 | 29 | 29 | 27 |
Feels °C | 32 | 30 | 31 | 30 | 29 | 29 | 28 | 28 | 29 | 27 | 27 | 29 | 27 | 27 | 26 | 26 | 28 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NE 7 | NNE 5 | NE 6 | NE 5 | SSW 13 | SSW 13 | NE 5 | SSW 16 | NNE 6 | SSW 14 | NE 8 | NE 7 | SSW 14 | SSW 13 | WNW 11 | NE 13 | NNE 10 | W 7 | NE 8 |
40 | 37 | 17 | 40 | 27 | 32 | 32 | 30 | 48 | 39 | 70 | 15 | 44 | 36 | 35 | 24 | 2023 | 358 | 97 | 57 | |
Swell 2 Height (m) Direction Period (s) | SSW 15 | W 10 | NE 7 | SSW 14 | SSW 13 | W 11 | WNW 13 | SSW 16 | WNW 12 | SSW 15 | W 12 | SSW 14 | SSW 14 | W 12 | W 11 | SSW 13 | WNW 13 | WNW 12 | NE 9 | W 7 |
47 | 18 | 16 | 40 | 35 | 22 | 33 | 51 | 28 | 44 | 11 | 41 | 40 | 11 | 9 | 35 | 58 | 51 | 115 | 34 | |
Swell 3 Height (m) Direction Period (s) | W 11 | SSW 15 | SSW 14 | W 10 | W 11 | S 18 | S 17 | SSW 13 | SSW 12 | W 12 | S 18 | W 11 | W 12 | E 10 | ENE 17 | SW 16 | S 13 | ENE 12 | WNW 12 | WNW 12 |
21 | 23 | 41 | 19 | 23 | 56 | 53 | 32 | 14 | 25 | 6 | 10 | 24 | 8 | 28 | 10 | 14 | 14 | 49 | 45 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NNE 7 | NNE 5 | — | NE 6 | — | NE 5 | NNE 6 | NE 5 | NNE 5 | NE 6 | NE 6 | — | SW 6 | SSW 6 | SW 6 |
— | — | — | — | — | 30 | 34 | — | 44 | — | 41 | 40 | 30 | 75 | 228 | 392 | — | 363 | 171 | 58 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 94 | 38 | 88 | 57 | 38 | 92 | 94 | 29 | 38 | 38 | 41 | 29 | 41 | 41 | 451 | 82 | 28 | 28 | 3 | 0 |
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.











