Surf Forecasts:
Sixtynine surf forecast from 13 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5PM (local time) - 1.5ft (0.4m), 12s period, WNW 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, 5PM (local time) - 1.5ft (0.4m), 12s period with WNW 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 5PM. The primary swell is predicted to be 0.4m and 12s period. 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 1.5m 8s period and expected on Saturday (Aug 15) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 19th Aug) | 1.5ft (0.4m) 12s |
| Best Surf | 5PM (Wed 19th Aug) | 1.5ft (0.4m) 12s |
| 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, Rusty here. It’s been a quiet stretch and, honestly, looking at the next sixteen days, there’s nothing that’s gonna get the heart racing for Sixtynine. The swell is tiny, the energy just isn’t there, and we’ve got a big run of flat or near-flat days to start. We kick off Thursday the 13th of August with a tiny 1 ft swell from the west-northwest, period a reasonable 12 seconds, but the wind’s a messy cross-shore from the north-northeast at 12 mph, so it’s choppy and ugly – combined swell energy is a weak 28. That sets the tone. Friday the 14th is even worse, with 0.7 ft to 0.3 ft swells and rubbish conditions. Saturday the 15th is basically flat as a lake, zero energy at 0. You could sleep in.
Sunday the 16th brings a bit of life back, but it’s still poor. We see 1 ft to 1 ft from the west-northwest, period up to 13 seconds, and even some glassy moments Monday the 17th and Tuesday the 18th afternoons with 1 ft – but the energy is pathetic, between 25 and 49. It’s surfable if you’re desperate but it’s not good. By Wednesday the 19th, we get glassy conditions again, same tiny 1 ft swell from the west-northwest, period 12 seconds, and energy of 48. It’s clean, but honestly, it’s still marginal for a proper session.
Now, here’s the one small highlight that stands out from the grey. Thursday the 20th of August afternoon. The swell drops off a bit to 1 ft, but the direction swings to the southwest with a much longer period of 17 seconds – that’s proper groundswell energy. The combined energy bumps up to 70, still moderate, but that’s the most we see in the whole run. The wind drops to dead calm, so it turns glassy. The record says “surfable waves but very ordinary conditions” and scores a 1. It’s not a classic, but relative to everything else, that Thursday arvo is the best on offer. That long-period south-west groundswell will wrap in nicely to Sixtynine, and with clean glass, you’ll get some little peelers.
After that, it’s back to the struggle. Friday the 21st through to Sunday the 23rd of August is all 0.7 ft to 1 ft from the west and south-west, with weak energy (8 to 55) and mostly cross or onshore winds. Monday the 24th through to Wednesday the 26th is the same story – tiny 1 ft from the west, period around 10 seconds, energy in the teens to low 20s. The wind is light cross-shore, and there’s a clean moment Tuesday the 25th arvo, but the waves just aren’t there. Thursday the 27th is a glassy afternoon again with 1 ft from the west, period 12 seconds, energy 24 – still tiny.
We finish on Friday the 28th of August with a 1 ft west-northwest swell, period 16 seconds – another proper long-period groundswell – and energy of 82, the highest of the entire forecast. The wind is a light cross-onshore from the north-northwest at 3 mph. It’s a tease, still small, but with that long period and improving conditions, it’s the other standout moment. But keep in mind, it’s more than a week away – we’re talking Friday the 28th – so treat it as promising but not certain.
Bottom line: it’s a flat, frustrating sixteen days for Sixtynine. The only two moments worth paddling out for are Thursday the 20th afternoon and Friday the 28th morning, both for the long-period groundswell and glassy or light winds. Otherwise, you’re best off doing something else. This area knows how to be quiet, and this is one of those stretches.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Sat night. Warm (max 29°C on Thu afternoon, min 25°C on Thu night). Winds increasing (light winds from the NE on Thu morning, near gales from the ENE by Sat night). | Days 4-6 Weather SummaryHeavy rain (total 40mm), heaviest during Sun morning. Warm (max 30°C on Sun afternoon, min 26°C on Sun morning). Wind will be generally light. | ||||||||||||||||||||
Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | |||||||||||||||
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 | W 12 | W 12 | NNE 6 | W 12 | W 12 | W 11 | NE 8 | WNW 13 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 13 | WNW 13 | WNW 12 | WNW 12 | SW 16 |
Wave Graph | |||||||||||||||||||||
28 | 25 | 11 | 0 | 24 | 11 | 9 | 0 | 34 | 31 | 49 | 27 | 25 | 24 | 24 | 25 | 31 | 55 | 48 | 48 | 41 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross | cross-on | glassy | on | glassy | cross-off | cross | cross-off | cross-off | glassy | glassy | cross-off |
High Tide | 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 | 8:37AM0.54m | 7:15PM0.33m | 9:44AM0.55m | 7:33PM0.25m | ||||||||
Low Tide | 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 | 3:09PM0.25m | 1:51AM0.05m | 5:41PM0.25m | 2:31AM0.07m | |||||||
6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | |
— | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:50 | — | — | 6:49 | — | |
mm | — | — | — | — | — | 1 | — | — | 11 | 33 | — | — | 1 | 4 | 1 | — | 1 | — | — | 1 | 1 |
Temp °C | 28 | 29 | 26 | 28 | 29 | 27 | 29 | 28 | 27 | 27 | 30 | 28 | 28 | 28 | 27 | 28 | 27 | 27 | 27 | 27 | 25 |
Feels °C | 28 | 28 | 27 | 27 | 28 | 26 | 28 | 29 | 29 | 30 | 33 | 32 | 32 | 33 | 32 | 32 | 31 | 30 | 30 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | NNE 6 | SSW 14 | NNE 6 | SSW 14 | SSW 13 | ENE 10 | NE 8 | NE 8 | NE 8 | NE 8 | NE 7 | NE 6 | NE 6 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NE 7 | NNE 6 | NNE 7 |
48 | 57 | 70 | 40 | 40 | 35 | 33 | 163 | 187 | 129 | 91 | 77 | 47 | 52 | 24 | 17 | 19 | 13 | 22 | 13 | 19 | |
Swell 2 Height (m) Direction Period (s) | WNW 12 | SSW 15 | W 12 | NE 8 | W 12 | ENE 10 | SSW 13 | ENE 10 | WNW 13 | WNW 13 | SSW 7 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | W 11 | WNW 13 | WNW 12 | WNW 12 | WNW 11 |
28 | 44 | 11 | 16 | 24 | 20 | 35 | 31 | 34 | 31 | 19 | 27 | 25 | 24 | 24 | 25 | 22 | 55 | 48 | 48 | 25 | |
Swell 3 Height (m) Direction Period (s) | SSW 12 | W 12 | S 18 | SSW 14 | SW 17 | W 12 | W 11 | SSW 13 | SSW 13 | SSW 13 | WNW 12 | SW 5 | SSW 12 | SSW 14 | ENE 8 | ENE 7 | W 13 | ENE 7 | SSW 16 | SW 16 | SW 16 |
28 | 25 | 6 | 41 | 12 | 11 | 9 | 35 | 18 | 33 | 49 | 1 | 14 | 20 | 6 | 5 | 31 | 5 | 25 | 42 | 41 | |
Wind waves Height (m) Direction Period (s) | NE 5 | — | NNE 6 | — | NE 6 | NNE 7 | NE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 4 |
27 | — | 53 | — | 102 | 145 | 282 | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 38 | 38 | 41 | 38 | 42 | 38 | 29 | 29 | 38 | 38 | 8 | 41 | 88 | 84 | 41 | 88 | 82 | 29 | 5 | 0 | 3 |
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.











