Surf Forecasts:
Sixtynine surf forecast from 16 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 8PM (local time) - 1ft (0.3m), 16s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 11PM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 57 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 8PM (local time) - 1ft (0.3m), 16s period with SW 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 Wednesday (Aug 19) at 8PM. The primary swell is predicted to be 0.3m and 16s period with a secondary swell of 0.3m and 12s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.4m 13s and forecast to arrive on Tuesday (Aug 18) at 11PM. 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 6s period and expected on Saturday (Aug 22) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Best Surf | 8PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Most Powerful | 11PM (Tue 18th Aug) | 1.5ft (0.4m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
G’day, I’m Rusty, and I’m looking at Sixtynine (Sixtynine) for the next 16 days. And mate, I gotta be honest – this stretch is a tough one. The water temp is sitting about average for this time of year, nothing unusual there. But the surf? It’s mostly flat or tiny, with poor conditions ruling the roost right through. We’ve got a long dry spell ahead with no real standouts, so patience is the name of the game.
Starting Sunday the 16th, it’s a write-off. A risk of thunderstorms, a tiny 1 ft swell from the WNW at 13 seconds, and weak energy (32) – not worth paddling out. The afternoon goes glassy with a 1 ft WNW swell at 12 seconds, but it’s still poor with energy at 49. Monday and Tuesday are more of the same: small 1 ft swells, light cross-shore winds, and energy barely ticking over between 24 and 39. Wednesday the 19th offers a brief moment of glass with 1 ft WNW swell at 12 seconds and energy at 48, but the waves are tiny – just not enough to get excited about.
Thursday the 20th afternoon gives us a glimpse: 1 ft from the SW at 17 seconds, glassy wind, and energy climbing to 70 – it’s labeled “surfable but very ordinary.” That’s the best we get for a while, but it’s still small. Friday through to the 24th is a slog: swells hover around 0.7-1 ft, winds shift onshore or cross-on, and energy stays below 60. The 26th shows a slight uptick – Wednesday morning has 2 ft from the WNW at 12 seconds with energy hitting 111 (moderate), and the afternoon is glassy with the same 2 ft and 114 energy – finally some surfable waves, but still “very ordinary.” That’s the highlight, and it’s barely a highlight.
From the 27th through the 31st, it’s back to small stuff: 1-1 ft swells, occasional glassy windows, but energy mostly under 70. The 31st Monday morning sees 1 ft from the WNW at 15 seconds with energy at 123 – again, moderate energy, but still poor conditions and tiny surf. For the whole 16-day run, there’s no day I’d call a standout. The consistency is there at Sixtynine, which is a small mercy, but the swell just isn’t cooperating. It’s a blank stretch where you’re better off waiting for a change in the forecast.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Sun afternoon. Warm (max 29°C on Sun morning, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 3mm), mostly falling on Fri afternoon. Warm (max 28°C on Wed morning, min 25°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 13 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | SW 16 | SW 18 | SW 17 | W 11 | W 11 | SW 16 | W 10 | SW 15 | WNW 10 | SW 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 32 | 49 | 27 | 25 | 25 | 25 | 25 | 25 | 33 | 48 | 28 | 41 | 49 | 47 | 21 | 9 | 39 | 18 | 37 | 20 | 36 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | glassy | cross | cross | cross-off | cross-on | cross | cross-off | glassy | glassy | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | cross-on | glassy |
High Tide | 6:24PM0.51m | 7:40AM0.53m | 6:51PM0.41m | 8:37AM0.54m | 7:15PM0.33m | 9:44AM0.55m | 7:33PM0.25m | 10:59AM0.57m | 12:08PM0.59m | 11:45PM0.18m | 1:04PM0.62m | 1:02AM0.20m | |||||||||
Low Tide | 12:35PM0.16m | 00:54AM0.02m | 1:40PM0.21m | 1:21AM0.04m | 3:09PM0.25m | 1:51AM0.05m | 5:41PM0.25m | 2:31AM0.07m | 3:32AM0.09m | 8:34PM0.15m | 8:53PM0.12m | ||||||||||
 | |  |  | |  | | | | | | | | |  | | | |  | | | |
 | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — |
 | — | 6:51 | — | — | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — |
mm | 1 | 4 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 | — | — | — |
Temp °C | 29 | 29 | 28 | 28 | 28 | 26 | 28 | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 33 | 33 | 33 | 32 | 32 | 30 | 31 | 30 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 32 | 32 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 8 | NE 8 | NE 7 | NE 6 | NE 6 | NNE 5 | NNE 5 | NNE 5 | WNW 13 | NE 7 | NNE 4 | NNE 6 | NNE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NE 7 | NE 6 | NE 6 | NE 6 |
| kJ | 112 | 75 | 65 | 45 | 62 | 22 | 17 | 10 | 33 | 24 | 3 | 16 | 16 | 17 | 31 | 18 | 31 | 35 | 21 | 80 | 45 |
Swell 2 Height (m) Direction Period (s) | SW 6 | SSW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 7 | WNW 12 | WNW 12 | WNW 11 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | WNW 10 |
| kJ | 18 | 15 | 27 | 25 | 25 | 25 | 25 | 25 | 4 | 48 | 28 | 25 | 49 | 47 | 69 | 69 | 39 | 64 | 37 | 63 | 34 |
Swell 3 Height (m) Direction Period (s) | WNW 13 | WNW 12 | WSW 5 | WSW 5 | S 14 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | SSW 16 | NNE 6 | SW 16 | WNW 11 | W 11 | W 11 | W 11 | W 10 | W 10 | WSW 10 | WNW 10 | SW 15 |
| kJ | 32 | 49 | 5 | 2 | 16 | 6 | 5 | 5 | 5 | 25 | 8 | 41 | 24 | 21 | 21 | 9 | 19 | 18 | 10 | 20 | 36 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNE 4 | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | 7 | — | — | — | — | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 42 | 46 | 29 | 29 | 94 | 88 | 94 | 29 | 5 | 92 | 3 | 8 | 0 | 5 | 8 | 44 | 5 | 84 | 5 | 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.
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