
Surf Forecasts:
Sixtynine surf forecast from 10 Sep 2026:
- Best quality surf: Thursday 10 Sep, 11PM (local time) - 1ft (0.3m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 11PM (local time) - 1.5ft (0.4m), 18s period, SW swell with 108 kJ wave energy.
- Next surfable swell (1★+): Thursday 10 Sep, 11PM (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 (Sep 10) at 11PM. 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 cross-offshore as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.4m 18s and forecast to arrive on Wednesday (Sep 16) at 11PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Wednesday (Sep 16) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Thu 10th Sep) | 1ft (0.3m) 17s |
| Best Surf | 11PM (Thu 10th Sep) | 1ft (0.3m) 17s |
| Most Powerful | 11PM (Wed 16th Sep) | 1.5ft (0.4m) 18s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, let’s get into it. Rusty here, looking at the next 16 days for Sixtynine.
First off, I’ve gotta be straight with you: this is a quiet stretch. The whole 16-day window is a bit of a flat spell, with only tiny scraps of swell showing up. The water’s sitting at 82°, which is pretty much what you’d expect for this time of year, so no drama there.
The first real chance to get wet comes on Thursday, September 10th. It’s small, real small – like 1 ft of swell coming from the SW with a very long period of 16 seconds. That’s a long-period groundswell, so it’ll have some push, but the energy is weak (42). The wind is light in the morning, going glassy in the afternoon. It’ll be clean, but with that tiny size, it’s more of a float session than a proper surf. The break is fairly exposed, and WSW is the optimum direction, so this SW swell is in the ballpark, but it’s just not got the size.
Friday the 11th is even smaller in the morning, with a 1 ft, 10-second swell, and the energy drops to 14. Glassy in the afternoon, but there’s no swell showing. Saturday and Sunday are essentially flat or have a tiny pulse of 0.7 ft – not worth paddling out for.
The pattern continues through the next week. Tiny 0.7 ft to 1 ft swells, most with weak energy, and a lot of glassy or light wind windows. The standout here is really the consistency of the glassy conditions, but with no power behind the waves, it’s frustrating.
The best chance for something that might actually get you a ride or two looks like Friday, September 25th. We’ve got a 2 ft, 14-second swell from the W, with the combined energy around 96 – still weak, but the highest of the whole period. The wind is light, but it’s onshore, so it won’t be perfect. Given the size and conditions, this is a beginner-friendly wave, but if you’re experienced, you’ll be bored.
Honestly, there’s no standout session in this 16-day window. The surf is poor, the energy is low, and the size never gets above 2 ft. It’s a stretch of small, clean conditions that are more suited to a longboard or a swim. If you’re desperate, the 25th offers the most potential, but keep expectations low.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Thu afternoon. Warm (max 29°C on Thu morning, min 25°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Tue morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | |||||||||||||||
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) | SW 16 | SW 18 | SW 10 | SW 10 | SW 15 | SW 9 | SW 14 | SW 14 | SW 14 | NNE 9 | W 11 | W 11 | W 10 | W 10 | NNE 8 | WSW 9 | NNE 4 | SW 19 | SW 18 | SW 18 | SW 17 |
Wave Graph | |||||||||||||||||||||
42 | 49 | 16 | 14 | 0 | 12 | 0 | 29 | 29 | 0 | 9 | 9 | 8 | 8 | 0 | 8 | 11 | 0 | 0 | 0 | 0 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | cross-off | cross-on | glassy | glassy | on | glassy | glassy | on | glassy | glassy | on | cross | glassy | cross-on | glassy | glassy | on | glassy | glassy |
High Tide | 3:45PM0.69m | 4:11AM0.53m | 4:16PM0.63m | 4:50AM0.58m | 4:46PM0.55m | 5:28AM0.61m | 5:15PM0.47m | 6:08AM0.62m | 5:43PM0.39m | 6:50AM0.62m | 6:10PM0.32m | 7:39AM0.59m | 6:37PM0.25m | ||||||||
Low Tide | 9:15AM-0.00m | 10:13PM-0.02m | 10:03AM0.02m | 10:37PM-0.02m | 10:50AM0.06m | 11:00PM-0.01m | 11:39AM0.10m | 11:22PM-0.00m | 12:31PM0.14m | 11:45PM0.02m | 1:34PM0.18m | 00:09AM0.04m | 3:00PM0.20m | 00:37AM0.07m | |||||||
6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 6:30 | — | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — | |
mm | — | 2 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 29 | 28 | 26 | 28 | 28 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 29 | 29 | 27 |
Feels °C | 33 | 32 | 30 | 31 | 31 | 30 | 29 | 30 | 31 | 29 | 30 | 29 | 30 | 31 | 30 | 32 | 32 | 32 | 32 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NNE 8 | NNE 5 | NE 4 | NNE 8 | NNE 8 | NNE 9 | NNE 9 | NNE 9 | NNE 9 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NE 8 | NNE 4 | NNE 5 | NNE 7 | NE 6 |
59 | 55 | 13 | 14 | 10 | 50 | 36 | 68 | 67 | 68 | 68 | 64 | 46 | 26 | 54 | 39 | 14 | 11 | 15 | 57 | 38 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 18 | SW 16 | NNE 8 | NNE 8 | SW 15 | SW 14 | SW 14 | NE 5 | SSW 12 | SSW 15 | SSW 14 | SW 14 | SSW 22 | SSW 21 | SW 20 | SW 19 | SW 19 | NE 7 | SW 18 | SW 17 |
42 | 49 | 67 | 13 | 23 | 57 | 49 | 29 | 7 | 15 | 21 | 20 | 8 | 46 | 45 | 98 | 96 | 94 | 27 | 152 | 75 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SW 10 | SW 10 | SW 15 | SW 9 | ENE 10 | WSW 8 | SW 14 | SSW 15 | W 11 | W 11 | W 10 | W 10 | SSW 13 | WSW 9 | WSW 9 | NE 7 | SW 18 | ENE 8 | NE 9 |
16 | 16 | 16 | 14 | 57 | 12 | 9 | 7 | 29 | 22 | 9 | 9 | 8 | 8 | 17 | 8 | 7 | 14 | 79 | 13 | 21 | |
Wind waves Height (m) Direction Period (s) | — | — | NNE 4 | — | — | — | — | — | — | — | NNE 4 | — | — | NNE 4 | — | — | NNE 4 | — | — | — | — |
— | — | 8 | — | — | — | — | — | — | — | 7 | — | — | 6 | — | — | 11 | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 29 | 29 | 5 | 88 | 88 | 5 | 88 | 58 | 29 | 92 | 57 | 75 | 92 | 92 | 31 | 5 | 5 | 5 | 8 | 3 | 5 |
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.










