
Surf Forecasts:
Sixtynine surf forecast from 5 Aug 2026:
- Most powerful swell: Sunday 9 Aug, 11AM (local time) - 1ft (0.3m), 13s period, W swell with 29 kJ wave energy.
Best Forecast Surf Conditions for Sixtynine this week:
The most powerful waves expected at Sixtynine in the next 16 days are 0.3m 13s and forecast to arrive on Sunday (Aug 09) at 11AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 7s period and expected on Sunday (Aug 09) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sun 9th Aug) | 1ft (0.3m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s see what we’re working with.
Honestly, brother, the next couple of weeks are a bit of a flat spell. We’ve got a real dry run on our hands, especially through the first week. The waves are tiny, the energy is weak, and there’s nothing worth getting wet for until the second half of the period. You’re gonna need some patience.
From Wednesday the 5th right through to Tuesday the 12th, it’s pretty grim. Swell heights barely hit 1ft, periods are mostly around 12 seconds, and the combined energy is almost always in the double digits (28 or less) – just weak, wobbly nothing. Winds are often cross-onshore or light, but with no real swell, it’s mostly flat or close to it. A couple of afternoons turn glassy on the 6th and 7th, but with only 0.7ft of swell, it’s not even a dribble. There’s a real gap here with no solid recommendations until things try to pick up later.
Now, Wednesday the 13th of August afternoon, we finally see a little pulse. Sixtynine gets a glassy window with a 1ft WNW swell and a 15-second period. The energy climbs to 71, which is still weak but at least there’s something. The water temp is 81°, about average for this time of year. But honestly, it’s still just ordinary conditions – surfable if you’re desperate, but nothing to write home about.
The best stretch looks to be from Thursday the 14th through Sunday the 17th of August. The swell pushes up to 2ft from the west, with periods between 13 and 16 seconds. The combined energy hits three-digit figures – 185 on Thursday morning, 164 on Friday, 159 on Saturday – so we’re talking moderate wave energy finally. The wind is mostly cross or cross-onshore, which is a bit of a buzzkill. On Monday the 17th afternoon, it goes glassy again with a 2ft west swell and 13-second period, and the energy drops back to 90. It’s surfable, but still very ordinary.
If I had to call a standout, it’s a toss-up between the afternoons of Thursday the 14th and Friday the 15th of August. The swell is a consistent 1-2ft from the WNW, with a very long period of 16 seconds. That groundswell will have proper shape, but at a spot like Sixtynine, that long period might make it a bit too straight for the beach break. The wind is just light cross-shore, so it’ll be a bit choppy but doable for an intermediate. Just don’t expect perfection.
Overall, it’s a lean couple of weeks. The first week is a write-off, and the second week offers a few windows where you can get wet, but nothing that’ll blow your mind.
- Rusty
Short Range ForecastMostly dry. Warm (max 29°C on Wed afternoon, min 24°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 29°C on Mon morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | |||||||||||||||
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) | W 13 | W 12 | W 12 | W 12 | W 12 | W 12 | W 12 | W 12 | W 13 | SSW 18 | NE 6 | NE 6 | W 13 | W 12 | W 12 | W 11 | W 11 | W 10 | W 10 | W 10 | W 12 |
Wave Graph | |||||||||||||||||||||
28 | 11 | 11 | 11 | 12 | 11 | 11 | 11 | 13 | 0 | 0 | 0 | 29 | 25 | 24 | 21 | 21 | 18 | 8 | 8 | 25 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | glassy | cross-on | glassy | cross-off | cross-on | glassy | cross-off | cross-on | cross-off | glassy | on | glassy | cross-off | cross-on | glassy | glassy | cross-on | cross-on | cross-off |
High Tide | 9:54AM0.57m | 8:12PM0.32m | 11:08AM0.63m | 9:29PM0.23m | 12:16PM0.69m | 11:28PM0.19m | 1:16PM0.76m | 1:00AM0.19m | 2:08PM0.80m | 2:05AM0.23m | 2:55PM0.83m | 2:57AM0.27m | 3:37PM0.84m | 3:45AM0.33m | |||||||
Low Tide | 4:37PM0.27m | 3:05AM-0.01m | 6:57PM0.22m | 4:04AM-0.01m | 8:13PM0.15m | 5:14AM-0.02m | 8:57PM0.09m | 6:24AM-0.04m | 9:32PM0.05m | 7:27AM-0.07m | 10:05PM0.02m | 8:23AM-0.08m | 10:36PM0.00m | ||||||||
6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
— | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | — | — | — | — | — | — | — |
Temp °C | 28 | 29 | 26 | 28 | 29 | 26 | 28 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 29 | 28 | 27 | 29 | 29 | 26 |
Feels °C | 31 | 32 | 30 | 30 | 32 | 30 | 29 | 30 | 29 | 30 | 31 | 29 | 32 | 32 | 31 | 33 | 32 | 30 | 31 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | NE 9 | NNE 5 | NNE 5 | NE 5 | NNE 5 | SSW 14 | W 12 | NE 6 | NNE 5 | NE 6 | NE 10 | NE 6 | NE 7 | NE 6 | NNE 6 | NE 6 | NNE 6 | NE 7 | NE 6 | NE 6 | NNE 6 |
22 | 15 | 8 | 22 | 17 | 20 | 11 | 44 | 17 | 31 | 14 | 56 | 69 | 83 | 44 | 43 | 67 | 44 | 42 | 56 | 37 | |
Swell 2 Height (m) Direction Period (s) | NE 5 | NE 9 | NE 8 | NE 8 | NE 8 | ENE 7 | SSW 14 | W 12 | NE 11 | NE 10 | SSW 18 | SSW 18 | W 13 | W 12 | W 12 | W 11 | SSW 15 | W 10 | SSW 14 | SSW 14 | SSW 13 |
5 | 20 | 18 | 10 | 9 | 5 | 18 | 11 | 18 | 15 | 31 | 30 | 29 | 25 | 24 | 21 | 47 | 18 | 41 | 40 | 35 | |
Swell 3 Height (m) Direction Period (s) | W 13 | W 12 | W 12 | W 12 | W 12 | W 12 | ENE 7 | SSW 13 | W 13 | SSW 18 | SSW 13 | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 12 | W 11 | SSW 15 | W 10 | W 10 | W 12 |
28 | 11 | 11 | 11 | 12 | 11 | 5 | 18 | 13 | 32 | 17 | 17 | 26 | 15 | 14 | 15 | 21 | 23 | 8 | 8 | 25 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NNE 5 | NNE 5 | — | — | — | NE 6 | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | 14 | 14 | — | — | — | 56 | — | — | — | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 88 | 88 | 42 | 88 | 88 | 38 | 29 | 88 | 38 | 88 | 39 | 29 | 84 | 38 | 38 | 94 | 94 | 46 | 88 | 97 | 82 |
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.











