Surf Forecasts:
Sixtynine surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 5AM (local time) - 1ft (0.3m), 17s period, SW swell with glassy winds.
- Most powerful swell: Saturday 22 Aug, 11PM (local time) - 2ft (0.6m), 11s period, WNW swell with 91 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5AM (local time) - 1ft (0.3m), 17s 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 Thursday (Aug 20) at 5AM. The primary swell is predicted to be 0.3m and 17s period with a secondary swell of 0.3m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.6m 11s and forecast to arrive on Saturday (Aug 22) 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 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 20th Aug) | 1ft (0.3m) 17s |
| Best Surf | 5AM (Thu 20th Aug) | 1ft (0.3m) 17s |
| Most Powerful | 11PM (Sat 22nd Aug) | 2ft (0.6m) 11s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, let’s get into it. The next 16 days look like a pretty drawn-out flat spell for Sixtynine. There’s very little energy, no solid swells, and most of the time we are looking at tiny waves and ordinary conditions. We have a gap starting from the 20th of August where there is just about nothing worth paddling for until the morning of the 23rd. After that, we get a brief pulse, but it’s not much to write home about.
Thursday the 20th and Friday the 21st, you can pretty much leave the board at home. Tiny 1 ft to 2 ft windswell from the SW or W, periods up to 18 seconds but with the onshore and cross-onshore airflow, it’s messy and weak (energy around 87-52). No score, no fun. The water temperature is your average for this time of year, nothing out of the ordinary.
The one day that shows any kind of life is Sunday the 23rd of August. Early morning, we get a clean little pulse from the WNW around 2 ft with a 12-second period, light cross-offshore breeze from the NE. Combined swell energy sits at 117 — you’ll feel a little push but it’s still small. For intermediates, you could scratch a few rides, but it is not going to blow your mind. Crowds are a possibility here at times, and consistency is usually reliable.
From Monday the 24th through to the 1st of September, it’s a near-total blank with barely enough energy to move the foam. A couple of glassy afternoons around the 25th and 26th but with zero swell. We start to see a few tiny pulses return from the 2nd of September: the afternoon of the 2nd sees a 1 ft WNW groundswell at a very long 16-second period, glassy conditions, and energy creeping up to 72 — surfable but very ordinary. The 3rd of September afternoon is similar, 1 ft WNW, 13 seconds, glassy, energy at 86. Still tiny, but the cleanest windows of the whole run.
The standouts? Honestly, there is no real standout here. If you are desperate, Sunday morning 23rd of August is the best of a very flat bunch — small but with clean conditions. After that, the afternoons of the 2nd and 3rd of September offer glassy windows with a bit of long-period WNW energy, but don’t expect much more than waist-high sliders.
Overall, the second week is as quiet as the first. This area knows how to go flat for long stretches and this is one of those times. Forecasts can change, but right now it looks poor.
That’s just how it goes sometimes.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Fri afternoon, min 25°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Tue afternoon. Warm (max 30°C on Sun morning, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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) | SW 16 | SW 18 | SW 17 | W 10 | W 10 | W 11 | W 10 | SW 15 | W 11 | WNW 11 | WNW 12 | WNW 11 | SW 14 | WNW 11 | WNW 12 | WNW 11 | NE 6 | NE 6 | NE 5 |
Wave Graph | |||||||||||||||||||
41 | 49 | 47 | 35 | 52 | 59 | 51 | 37 | 58 | 91 | 75 | 45 | 32 | 13 | 14 | 12 | 0 | 0 | 0 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | on | cross-on | glassy | cross-on | on | glassy | cross-on | cross | cross-off | cross-off | cross | glassy | on | cross-on | glassy | cross-on | glassy | cross-off |
High Tide | 10:59AM0.57m | 12:08PM0.59m | 11:45PM0.18m | 1:04PM0.62m | 1:02AM0.20m | 1:49PM0.66m | 1:48AM0.23m | 2:26PM0.69m | 2:25AM0.28m | 2:59PM0.71m | 3:00AM0.33m | ||||||||
Low Tide | 2:31AM0.07m | 3:32AM0.09m | 8:34PM0.15m | 8:53PM0.12m | 6:05AM0.06m | 9:13PM0.10m | 7:02AM0.04m | 9:33PM0.09m | 7:49AM0.01m | 9:53PM0.07m | |||||||||
— | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
6:49 | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 1 | 3 | 1 |
Temp °C | 27 | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 30 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 30 | 30 | 32 | 31 | 32 | 32 | 31 | 32 | 28 | 32 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 32 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NE 7 | NE 7 | NE 6 | NE 6 | WNW 11 | WNW 12 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 5 |
22 | 33 | 42 | 31 | 27 | 52 | 44 | 43 | 75 | 91 | 75 | 73 | 32 | 38 | 43 | 42 | 36 | 56 | 30 | |
Swell 2 Height (m) Direction Period (s) | WNW 11 | W 11 | W 11 | W 10 | W 10 | W 11 | W 10 | WNW 10 | W 11 | SW 15 | SW 15 | WNW 11 | WNW 10 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 14 |
25 | 38 | 37 | 35 | 52 | 59 | 51 | 33 | 58 | 58 | 34 | 45 | 18 | 18 | 35 | 32 | 15 | 14 | 21 | |
Swell 3 Height (m) Direction Period (s) | SW 16 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | WSW 9 | WSW 9 | SW 14 | SW 14 | WNW 11 | WNW 12 | WNW 11 | SSW 16 | SSW 16 | SSW 12 |
41 | 49 | 47 | 69 | 69 | 65 | 64 | 37 | 63 | 9 | 8 | 33 | 32 | 13 | 14 | 12 | 25 | 24 | 14 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NE 6 | NE 6 | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | 47 | 49 | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 3 | 8 | 8 | 5 | 8 | 5 | 5 | 5 | 8 | 0 | 0 | 5 | 29 | 84 | 94 | 38 | 84 | 84 | 43 |
Best forecast wave conditions in Big Island | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











