Surf Forecasts:
Sixtynine surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 11PM (local time) - 1ft (0.3m), 16s period, SW swell with glassy winds.
- Most powerful swell: Sunday 23 Aug, 2AM (local time) - 2ft (0.6m), 11s period, WNW swell with 91 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 11PM (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 11PM. 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 0.6m 11s and forecast to arrive on Sunday (Aug 23) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Monday (Aug 24) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Best Surf | 11PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Most Powerful | 2AM (Sun 23rd Aug) | 2ft (0.6m) 11s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s be straight with you – this outlook is a tough one for Sixtynine. The whole 16-day window is a flat, quiet stretch with hardly any energy to get excited about. We’re talking about a long, frustrating gap of nothing worth paddling out for, especially from the start all the way through to the end of August. The water temp is sitting at a warm 81°, which is about average for this time of year, so at least you won’t be cold while you’re sitting there waiting.
The first real mention of any swell shows up on Thursday, August 20th. It’s a tiny 1.0ft from the SW with a long period of 17 seconds, but the energy is weak (68). The afternoon gets glassy, but it’s still just ordinary, small stuff. Not a standout.
The only slight flicker of something better comes on Saturday, August 23rd in the morning. We’ve got a 2ft swell from the WNW, period around 11 seconds, and the combined energy nudges into the moderate range at 110. But the wind is a cross-shore breeze, not clean, and it’s still just poor conditions. The crowd situation at Sixtynine can be busy sometimes, but honestly, with this tiny surf, it won’t be an issue.
Sunday, August 30th brings a similar story – a 1ft WNW swell, period up to 15 seconds (that’s a long period groundswell), and energy at 80. The wind is cross-shore again, so it’s chopped up. For a spot like Sixtynine, which is fairly exposed to WNW, the direction is right, but the size is just too small for any real fun.
The best call? There isn’t one. If you’re desperate, the glassy afternoon on Thursday, August 20th might give you a couple of tiny, clean ankle-biters, but that’s it. This setup is more interesting for kite surfing than paddle surfing, with the small swell and light winds. For the rest of the window, it’s a flat spell. Don’t hold your breath.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 25°C on Wed night). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Fri night. Warm (max 29°C on Fri afternoon, min 25°C on Fri night). Wind will be generally light. | |||||||||||||||||||
Tue 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | ||||||||||||||
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 13 | WNW 12 | WNW 12 | SW 16 | SW 18 | SW 17 | W 11 | WNW 10 | WNW 10 | W 11 | W 10 | WNW 10 | WNW 11 | WNW 11 | WNW 10 | SW 14 | WNW 11 | WNW 12 | WNW 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 25 | 33 | 48 | 28 | 41 | 49 | 47 | 21 | 35 | 35 | 57 | 52 | 34 | 91 | 68 | 41 | 32 | 12 | 14 | 13 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross-off | on | glassy | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | cross | cross-off | cross | cross | cross-off | cross | on | cross-off |
High Tide | 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 | 2:26PM0.69m | 2:25AM0.28m | ||||||||
Low Tide | 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 | 7:02AM0.04m | 9:33PM0.09m | |||||||||
 |  | | | |  | | | | |  | | |  | | | | | | | |
 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — |
 | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 |
Feels °C | 31 | 30 | 31 | 32 | 30 | 31 | 31 | 32 | 31 | 32 | 32 | 31 | 31 | 29 | 30 | 29 | 28 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 5 | NNE 5 | NE 5 | NE 5 | NNE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NE 7 | N 7 | NE 6 | NE 6 | WNW 11 | WNW 11 | WNW 10 | SW 14 | NE 6 | NE 6 | NE 7 |
| kJ | 27 | 16 | 11 | 12 | 22 | 16 | 32 | 31 | 30 | 44 | 23 | 54 | 78 | 91 | 68 | 41 | 32 | 52 | 88 | 75 |
Swell 2 Height (m) Direction Period (s) | WNW 11 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | W 11 | SW 17 | SW 16 | WNW 10 | WNW 10 | W 11 | W 10 | WNW 10 | SW 15 | SW 15 | SSW 14 | WNW 9 | WNW 11 | SSW 13 | SSW 13 |
| kJ | 25 | 33 | 48 | 28 | 25 | 21 | 47 | 69 | 35 | 35 | 57 | 52 | 34 | 36 | 34 | 21 | 8 | 12 | 35 | 16 |
Swell 3 Height (m) Direction Period (s) | W 13 | ENE 7 | NNE 7 | NNE 6 | SW 16 | SW 18 | W 11 | W 11 | SW 16 | SW 16 | NE 5 | SW 15 | SW 16 | WSW 9 | WSW 9 | SSW 16 | ENE 8 | SSW 14 | WNW 12 | WNW 11 |
| kJ | 14 | 5 | 5 | 8 | 41 | 49 | 21 | 21 | 69 | 65 | 8 | 37 | 63 | 9 | 8 | 24 | 6 | 18 | 14 | 13 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 6 | NE 6 | NNE 6 | NE 6 | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | 47 | 51 | 63 | 47 | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 88 | 29 | 88 | 92 | 3 | 8 | 0 | 5 | 5 | 5 | 42 | 5 | 5 | 0 | 8 | 8 | 25 | 94 | 46 | 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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