Surf Forecasts:
Sixtynine surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 8PM (local time) - 1ft (0.3m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 2PM (local time) - 1.5ft (0.5m), 11s period, WNW swell with 69 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 cross-offshore as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.5m 11s and forecast to arrive on Sunday (Aug 23) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Friday (Aug 21) at 11PM.
| 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 | 2PM (Sun 23rd Aug) | 1.5ft (0.5m) 11s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, I’m Rusty, and I’m looking at the next couple of weeks at Sixtynine.
Let’s be real: the surf is looking pretty flat and uninspiring for the vast majority of this 16-day window. We’ve got a long stretch of poor conditions. The first solid recommendation doesn’t come until Sunday afternoon, August 23rd, and even then it’s not great. From Monday the 17th right through to Saturday the 22nd, it’s mostly tiny waves with poor surf conditions. A couple of glassy moments on Thursday the 20th afternoon and Friday the 21st afternoon, but the swell is only 1.0 ft – barely enough to get a ride. The water temp is around 81°, which is about average for this time of year.
Then Sunday the 23rd morning shows a little bump in energy, with the combined swell energy at 121 (moderate), but the wind is a cross-shore at 9 mph, creating chop. Not worth rushing out for.
The real standout, such as it is, comes on Sunday afternoon, August 30th. We’ve got a 1 ft swell from the WNW with a period of 16 seconds – that’s a long-period groundswell. The combined energy hits 114 (moderate). The wind goes glassy from the WSW at just 3 mph. This combination is your best bet for a clean, glassy session. That long period means the waves will have some shape and energy, but at 1 ft, it’s small. It’s a point break or reef setup kind of day, not a beach break.
Monday the 31st morning sees a similar sized swell (2 ft) from the W, period 15 seconds, energy 114, but the wind is a light cross-onshore, making it a bit bumpy. The afternoon on the 31st has the same swell but a cross-shore wind, still not ideal.
Overall, this is a lean period. If you’re desperate for a paddle, target the glassy Sunday afternoon on August 30th. Otherwise, this stretch looks more interesting for a flat-water paddle than a surf. Forecasts can change though.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 28°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Fri night. Warm (max 29°C on Sat morning, min 25°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | SW 16 | SW 18 | SW 17 | W 11 | W 10 | SW 16 | WNW 10 | SW 15 | WNW 10 | SW 15 | WNW 12 | WNW 11 | WNW 10 |
Wave Graph  | ||||||||||||||||||||
 kJ | 24 | 25 | 25 | 25 | 33 | 48 | 48 | 41 | 49 | 47 | 20 | 19 | 39 | 35 | 37 | 34 | 36 | 55 | 45 | 18 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | on | cross | glassy | on | cross | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | glassy | glassy | cross | cross | cross-off |
High Tide | 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 | 1:49PM0.66m | 1:48AM0.23m | ||||||||
Low Tide | 1:21AM0.04m | 3:09PM0.25m | 1:51AM0.05m | 5:41PM0.25m | 2:31AM0.07m | 3:32AM0.09m | 8:34PM0.15m | 8:53PM0.12m | 6:05AM0.06m | 9:13PM0.10m | ||||||||||
 |  | | | | | | |  | | | | |  | | |  | | | | |
 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — |
Temp °C | 28 | 26 | 27 | 27 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 29 | 29 | 27 | 28 | 28 | 27 |
Feels °C | 33 | 29 | 30 | 31 | 29 | 31 | 31 | 30 | 31 | 32 | 32 | 31 | 31 | 31 | 32 | 32 | 31 | 29 | 28 | 28 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NNE 5 | NNE 5 | WNW 11 | NNE 4 | WNW 12 | WNW 12 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 | NE 6 | NE 7 | NE 6 | NE 5 | WNW 10 | WNW 12 | NNE 6 | NE 6 |
| kJ | 45 | 17 | 15 | 25 | 8 | 48 | 48 | 22 | 33 | 31 | 31 | 30 | 43 | 44 | 38 | 23 | 33 | 55 | 53 | 38 |
Swell 2 Height (m) Direction Period (s) | WNW 11 | NE 8 | WNW 11 | ENE 7 | WNW 13 | NE 7 | SW 16 | WNW 11 | SW 18 | SW 17 | SW 16 | W 10 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 12 | WNW 10 | WNW 11 | WNW 10 |
| kJ | 24 | 9 | 25 | 5 | 33 | 12 | 42 | 25 | 49 | 47 | 69 | 19 | 20 | 35 | 33 | 34 | 28 | 32 | 45 | 18 |
Swell 3 Height (m) Direction Period (s) | S 14 | WNW 11 | NE 8 | W 13 | ENE 7 | NNE 7 | W 7 | SW 16 | WNW 11 | W 11 | W 11 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | SW 15 | SW 15 | SSW 14 | SSW 14 |
| kJ | 16 | 25 | 9 | 14 | 5 | 9 | 4 | 41 | 24 | 21 | 20 | 69 | 39 | 64 | 37 | 63 | 36 | 34 | 21 | 20 |
Wind waves Height (m) Direction Period (s) | — | — | — | NNE 5 | — | — | NNE 6 | — | — | — | — | — | — | — | — | — | NE 5 | NNE 6 | — | — |
| kJ | — | — | — | 16 | — | — | 23 | — | — | — | — | — | — | — | — | — | 25 | 49 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 88 | 46 | 94 | 29 | 29 | 88 | 5 | 3 | 8 | 0 | 5 | 8 | 84 | 5 | 5 | 5 | 0 | 8 | 38 | 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.
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