
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 onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 8s period and expected on Thursday (Sep 17) at 2PM.
| 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
Alright folks, Rusty here. Let’s be straight with you: the next two weeks are a bit of a flat spell for this stretch of coast. We’re looking at a long stretch of small, weak energy and generally poor surf quality. It’s going to be a test of patience.
The water temp is sitting at about 82°F, which is just about average for this time of year, so at least the water feels normal when you’re out there floating around waiting for nothing.
We start off this Thursday morning, the 10th of September, with a tiny 1ft swell rolling in from the southwest, but with a very long period of 16 seconds. That’s a groundswell, but the combined energy is a weak 42. The wind is a light cross-off from the NNE, so conditions are clean, but the wave comment calls it poor surf conditions. Thursday afternoon goes glassy with the wind dropping to zero, but still just that 1ft of SW groundswell with an 18-second period. The energy is still weak (49). It’s clean as a whistle, but there’s just nothing to ride.
Friday the 11th is more of the same: 1ft SW swell in the morning, though the period drops to 10 seconds and the energy tanks to 14. The wind is a light cross-on from the NNW, so a little bumpy. The afternoon goes glassy again with a 9-second period and energy at 13. Still poor surf.
Saturday the 12th has a glimmer of hope in the afternoon. A 1ft swell from the SW with a 14-second period comes through, and the wind goes glassy. The energy is 36. Still small, but glassy conditions make it the most pleasant it’s been. The morning has zero swell.
Sunday the 13th through to the end of the first week is a real struggle. We’ve got days with no swell at all, or just tiny 0.7ft – 2ft slop with poor wind and low energy. The best of a bad bunch is Sunday afternoon: a 2ft swell from the NNE, but with a terrible 4-second period and energy of only 21. That’s just wind chop.
The second week doesn't bring much relief. We finally see a little pulse on Friday the 18th of September. The morning shows a 2ft SW swell with an 18-second period, and the combined energy finally breaks into three digits at 108. That’s moderate energy for the first time. Wind is a light cross-shore from the N. It’s still small, but that longer period groundswell has a bit more push. The afternoon fades again.
The standout for the whole period, and I mean the only real standout, is that Friday morning the 18th of September at Sixtynine. It’s a consistent break, rated for intermediates. The swell is a tiny 2ft from the SW, but with an 18-second period, it’s the most organised energy we’ll see. The combined energy (108) is the highest of the forecast. The wind is a light cross-shore, so it should be fairly clean. The crowds can be around sometimes, but on a day like this, you might have it quiet. That’s your best bet if you’re desperate for a paddle.
After that, it’s back to tiny glassy mornings and weak afternoons right through to the 25th. A lot of days with no swell and a lot of glassy conditions that will be beautiful to look at, but useless for surfing.
If you’re a kite surfer, there’s nothing here for you either, as the wind stays light throughout.
So, to sum it up: a very long, flat run. If you have to surf, circle Friday the 18th of September for the best (and really only) chance at a few long-period, clean lines, but keep your expectations on the floor. The forecasts can always change, but right now, it’s a waiting game.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Thu afternoon. Warm (max 28°C on Thu morning, min 25°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Tue afternoon. Warm (max 29°C on Mon afternoon, 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 9 | SW 15 | SW 15 | SW 14 | SW 14 | NNE 9 | W 11 | W 11 | W 10 | SSW 22 | NNE 8 | WSW 9 | WSW 9 | WSW 8 | N 9 | SW 18 | SW 17 |
Wave Graph | |||||||||||||||||||||
42 | 49 | 16 | 14 | 13 | 0 | 0 | 29 | 29 | 0 | 12 | 9 | 8 | 0 | 0 | 8 | 7 | 7 | 7 | 0 | 0 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | glassy | cross-off | cross-on | glassy | glassy | on | glassy | glassy | cross-on | cross-on | cross-off | cross-on | glassy | glassy | on | glassy | glassy | cross-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 | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — |
Temp °C | 28 | 28 | 26 | 28 | 28 | 25 | 27 | 27 | 26 | 28 | 28 | 26 | 28 | 29 | 26 | 29 | 28 | 27 | 29 | 29 | 27 |
Feels °C | 31 | 32 | 30 | 30 | 31 | 29 | 30 | 30 | 31 | 30 | 30 | 28 | 30 | 32 | 30 | 33 | 31 | 31 | 33 | 33 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 7 | NNE 8 | NE 5 | NNE 8 | NNE 8 | NNE 8 | NE 9 | NNE 9 | NNE 9 | NNE 9 | NNE 8 | NNE 8 | NNE 4 | NNE 8 | SW 20 | NNE 8 | NNE 7 | NE 7 | NNE 7 | NE 7 |
57 | 47 | 13 | 10 | 51 | 50 | 44 | 77 | 68 | 99 | 50 | 64 | 61 | 10 | 54 | 98 | 50 | 36 | 56 | 57 | 47 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 18 | SW 16 | NNE 8 | SW 15 | SW 15 | SW 15 | SW 14 | NE 5 | SSW 12 | SSW 15 | SSW 14 | SW 14 | NNE 8 | SSW 21 | WSW 9 | SW 19 | SW 19 | SW 18 | SW 18 | SW 17 |
42 | 49 | 67 | 13 | 57 | 57 | 60 | 29 | 7 | 15 | 21 | 20 | 7 | 26 | 45 | 8 | 96 | 94 | 79 | 152 | 75 | |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SW 10 | SW 10 | SW 9 | ENE 10 | ENE 10 | WSW 8 | SW 14 | SSW 15 | W 11 | W 11 | W 10 | SSW 22 | SSW 13 | SW 13 | WSW 9 | WSW 8 | N 9 | ENE 9 | ENE 9 |
16 | 16 | 16 | 14 | 13 | 20 | 9 | 7 | 29 | 22 | 9 | 9 | 8 | 46 | 17 | 7 | 7 | 7 | 7 | 15 | 17 | |
Wind waves Height (m) Direction Period (s) | — | — | NE 4 | — | — | — | — | — | — | — | NNE 4 | — | — | — | — | NNE 8 | — | — | — | — | — |
— | — | 10 | — | — | — | — | — | — | — | 12 | — | — | — | — | 50 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 29 | 94 | 5 | 88 | 5 | 75 | 88 | 45 | 29 | 29 | 94 | 46 | 112 | 94 | 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.










