Surf Forecasts:
Sixtynine surf forecast from 25 Aug 2026:
- Most powerful swell: Sunday 30 Aug, 5AM (local time) - 1ft (0.3m), 16s period, SW swell with 43 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 16s and forecast to arrive on Sunday (Aug 30) 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 1.0m 8s period and expected on Monday (Aug 31) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sun 30th Aug) | 1ft (0.3m) 16s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here, and I’m looking at the 16-day outloook for the region. Plain truth is, it’s a tough stretch of small surf with precious little to get excited about. The ocean’s feeling pretty flat and disorganised for the most part.
Right now, early on August 24th, there’s just tiny 0.66ft swell from the WNW with a 12-second period, but it’s labeled as poor surf conditions. The water is sitting at 82°F, which is a touch warmer than normal for this time of year. The wind is light onshore, not doing us any favours for clean waves.
We’ve got a real dry spell coming. From August 25th right the way through to August 30th, the swell pretty much disappears – zero wave energy for several days in a row. The winds are mostly light cross-shore or glassy, but without any waves, those clean conditions don’t mean a thing. That’s a frustrating gap of nearly a week of flatness.
Monday August 31st sees a tiny bump: 1.0ft swell from the SW with a very long 15-second period and combined energy at 42 (weak energy). The wind is glassy in the afternoon, but the swell is too small to call it a proper surf. Then it goes quiet again until September 6th.
The only hint of something better is on Sunday September 6th: a 1.0ft swell from the SW, period of 18 seconds (very long period groundswell), combined energy at 49 (still weak energy) and light onshore wind. That’s a promising direction and period, suggesting some proper lines, but it’s just too small to be rideable. And then into the final part of the run, on September 7th and 8th, the swell builds a little – up to 2ft from the WNW with a period of 12 seconds. The combined energy hits 112 on the 8th, which is at least in the moderate range. But it’s still small and bumpy with cross-onshore wind.
The only spot we’ve got to talk about is Sixtynine. It’s a fairly exposed, consistent wave for intermediates, and the optimum swell direction is from the WNW. For a couple of days around September 7th and 8th, the swell is from the W and WNW, which is right in the sweet spot. That’s the best possible window. But with the swell only 2ft, even with a 12-second period and the right direction, it’s going to be a knee-high day at best. It’s not a standout – more a glimmer of hope after a long flat spell. The crowds are listed as “sometimes” here, so you might get a few others with the same idea, but given the tiny size, it won’t be a zoo.
For now, it’s a waiting game. Better days might be on the horizon, but in the short term, we’re stuck with not much. Look to that first week of September with cautious optimism.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Mon afternoon. Warm (max 29°C on Mon morning, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Thu afternoon, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | |||||||||||||||
AM | 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) | WNW 12 | NW 11 | NW 10 | NE 6 | NE 6 | NE 5 | NNE 5 | NE 6 | W 10 | W 10 | SSW 15 | W 9 | SSW 14 | NE 6 | W 10 | SSW 13 | NE 6 | NNE 6 | W 12 | NNE 7 | SW 15 |
Wave Graph | |||||||||||||||||||||
13 | 5 | 4 | 0 | 0 | 0 | 0 | 0 | 8 | 8 | 0 | 7 | 0 | 0 | 7 | 0 | 0 | 0 | 11 | 0 | 35 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-off | cross | cross | cross-off | cross | glassy | cross-off | cross | cross-off | cross-off | cross-on | glassy | cross-off | cross | cross-off | cross-off | cross | cross | glassy |
High Tide | 2:26PM0.69m | 2:25AM0.28m | 2:59PM0.71m | 3:00AM0.33m | 3:28PM0.72m | 3:36AM0.38m | 3:56PM0.71m | 4:12AM0.43m | 4:24PM0.68m | 4:50AM0.48m | 4:52PM0.63m | 5:31AM0.53m | 5:21PM0.56m | ||||||||
Low Tide | 9:33PM0.09m | 7:49AM0.01m | 9:53PM0.07m | 8:30AM0.00m | 10:13PM0.05m | 9:11AM0.01m | 10:35PM0.03m | 9:51AM0.02m | 10:57PM0.01m | 10:34AM0.05m | 11:20PM-0.01m | 11:21AM0.09m | 11:45PM-0.02m | ||||||||
6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | |
— | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | |
mm | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 29 | 27 | 29 | 29 | 26 | 27 | 28 | 25 | 27 | 28 | 25 | 28 | 28 | 26 | 27 | 27 | 25 | 29 | 29 | 26 |
Feels °C | 33 | 34 | 31 | 31 | 31 | 29 | 27 | 30 | 26 | 28 | 30 | 27 | 30 | 30 | 28 | 29 | 29 | 27 | 30 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NE 7 | NE 6 | NE 6 | NE 6 | SSW 14 | NNE 5 | NE 6 | SSW 13 | NNE 5 | NE 5 | SSW 15 | NNE 5 | NE 6 | NNE 6 | NNE 5 | NE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 |
46 | 73 | 38 | 38 | 39 | 21 | 21 | 49 | 17 | 17 | 20 | 42 | 17 | 47 | 35 | 12 | 54 | 34 | 40 | 59 | 59 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 15 | SSW 17 | SSW 16 | SSW 16 | SSW 15 | N 8 | NNE 7 | NNE 7 | SSW 13 | NE 6 | SSW 12 | SSW 17 | SSW 16 | SSW 15 | SW 15 |
18 | 35 | 32 | 30 | 14 | 14 | 21 | 27 | 25 | 48 | 44 | 5 | 11 | 10 | 34 | 14 | 15 | 27 | 25 | 22 | 35 | |
Swell 3 Height (m) Direction Period (s) | WNW 12 | NW 11 | NW 10 | SSW 16 | SSW 16 | ENE 7 | SSW 11 | SSW 14 | W 10 | W 10 | SSW 12 | W 9 | SSW 14 | SSW 13 | W 10 | SSW 13 | E 13 | ENE 7 | W 12 | S 12 | W 11 |
13 | 5 | 4 | 25 | 24 | 5 | 12 | 18 | 8 | 8 | 14 | 7 | 39 | 18 | 7 | 16 | 13 | 5 | 11 | 11 | 9 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NE 5 | — | — | NNE 5 | — | — | NNE 5 | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | 25 | — | — | 17 | — | — | 16 | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 94 | 45 | 88 | 38 | 105 | 94 | 38 | 94 | 38 | 88 | 41 | 38 | 88 | 97 | 41 | 88 | 88 | 29 | 92 | 29 | 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.











