
Surf Forecasts:
Sixtynine surf forecast from 11 Sep 2026:
- Best quality surf: Tuesday 15 Sep, 5AM (local time) - 1ft (0.3m), 21s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 16 Sep, 2PM (local time) - 1.5ft (0.4m), 18s period, SW swell with 109 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 5AM (local time) - 1ft (0.3m), 21s 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 Tuesday (Sep 15) at 5AM. The primary swell is predicted to be 0.3m and 21s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.4m 18s and forecast to arrive on Wednesday (Sep 16) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 8s period and expected on Thursday (Sep 17) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Tue 15th Sep) | 1ft (0.3m) 21s |
| Best Surf | 5AM (Tue 15th Sep) | 1ft (0.3m) 21s |
| Most Powerful | 2PM (Wed 16th Sep) | 1.5ft (0.4m) 18s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s be straight with you. The next couple of weeks are looking pretty bleak for a proper paddle at Sixtynine. We’ve got a long stretch of tiny, weak swell and mostly onshore or cross-onshore breezes. It’s not going to be pretty out there.
The forecast starts with a flat spell. From Friday the 11th through to Wednesday the 16th, we’re looking at nothing but dribbles—swell heights barely reaching 1ft, with periods mostly under 10 seconds. There’s a bit of glassy action on Friday morning and Monday afternoon, but with that little energy, it’s just not worth getting wet. You’d be fighting for a knee-high slop. The combined energy is weak, sitting in the single digits to low teens (14, 13, 9). It’s a blank run, plain and simple.
Then we get a slight pulse on Thursday the 17th into Friday the 18th. The swell bumps up to 1ft on Friday morning with a period of 18 seconds and combined energy jumping to 108 (moderate). That long period is a hint of something better, but it’s still tiny. The wind is light, even glassy Friday afternoon, but with that size, it’s just not breaking with any push. This is a tease, not a treat.
The weekend and into the next week stays stubbornly small. From Saturday the 19th through Wednesday the 23rd, we’re back to flatness and weak pulses, nothing over 1ft. The energy stays weak, in the 32-44 range at best. The wind is mostly light but often onshore or cross-on, keeping things messy. There’s a risk of thunderstorms on a few afternoons, which at least adds some drama to the flatness.
The second week, around the 23rd and 24th, we see a few more pulses, but they’re inconsistent and still small. 1ft at 16 seconds on Wednesday the 23rd gives us a moderate energy reading of 43, and we get a similar 1ft at 16 seconds on Friday the 25th with 39 energy. But it’s not enough. The swell direction is mostly from the SW, which is okay, but the size just isn’t there to make anything of it.
Honestly, if you’re looking for a surf, you’re going to be staring at a lake for most of this period. The best we can say is that the water temperature has no notable anomaly mentioned, so it’s about average for this time of year. But that’s cold comfort when there’s nothing to ride.
If you’re into kites, some of those windier, bumpier afternoons with onshore wind and minimal swell might look more interesting. For the rest of us, it’s a case of waiting it out. These flat spells happen, and they don’t usually last forever. Check back with me later.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 28°C on Fri morning, min 25°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 30°C on Wed morning, min 24°C on Sun night). Wind will be generally light. | ||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | ||||||||||||||
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 10 | SW 10 | SW 9 | SW 15 | SW 15 | SW 14 | SW 14 | NNE 9 | W 11 | W 11 | W 10 | NNE 4 | NNE 8 | WSW 9 | SW 19 | SW 19 | SW 18 | SW 11 | SW 9 |
Wave Graph | |||||||||||||||||||
16 | 14 | 13 | 0 | 0 | 29 | 29 | 0 | 9 | 9 | 8 | 5 | 0 | 8 | 0 | 0 | 0 | 5 | 3 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | glassy | glassy | on | on | cross-off | cross-on | cross | cross-off | cross-on | glassy | glassy | on | glassy | glassy | cross-on | cross | cross-off |
High Tide | 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 | 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 | — | — | |
6:30 | — | 6:29 | — | — | 6:28 | — | — | 6:28 | — | — | 6:27 | — | — | 6:25 | — | — | 6:24 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 28 | 28 | 26 | 27 | 27 | 26 | 27 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 30 | 29 | 27 |
Feels °C | 28 | 31 | 31 | 29 | 29 | 30 | 30 | 29 | 30 | 28 | 30 | 30 | 31 | 31 | 32 | 31 | 34 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | NNE 5 | NNE 4 | NNE 8 | NNE 8 | NNE 8 | NNE 9 | NNE 9 | NNE 9 | NNE 9 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NNE 8 | NE 6 | NE 5 | NE 5 | NNE 7 | NNE 7 |
15 | 7 | 23 | 50 | 43 | 67 | 68 | 68 | 67 | 64 | 61 | 26 | 51 | 50 | 33 | 11 | 27 | 76 | 96 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | NNE 8 | SW 15 | SW 15 | SW 15 | SW 14 | NE 4 | SSW 12 | SSW 15 | SSW 14 | SW 14 | SSW 22 | SSW 21 | SW 20 | NNE 8 | NNE 7 | SW 18 | SW 18 | SW 17 |
67 | 22 | 57 | 57 | 60 | 29 | 4 | 15 | 21 | 20 | 7 | 46 | 45 | 98 | 22 | 21 | 79 | 152 | 75 | |
Swell 3 Height (m) Direction Period (s) | SW 10 | SW 10 | SW 9 | ENE 10 | ENE 10 | NE 5 | SW 14 | SSW 15 | W 11 | W 11 | W 10 | SSW 14 | SSW 13 | WSW 9 | SW 19 | SW 19 | NNE 7 | SW 11 | SW 9 |
16 | 14 | 13 | 20 | 9 | 3 | 29 | 22 | 9 | 9 | 8 | 18 | 17 | 8 | 96 | 94 | 10 | 5 | 3 | |
Wind waves Height (m) Direction Period (s) | — | — | NE 5 | — | — | — | — | NE 4 | NNE 4 | — | — | NNE 4 | — | — | — | — | — | — | — |
— | — | 10 | — | — | — | — | 4 | 7 | — | — | 5 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 5 | 88 | 5 | 29 | 88 | 88 | 29 | 88 | 38 | 38 | 92 | 92 | 38 | 5 | 5 | 5 | 5 | 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.










