Surf Forecasts:
Sixtynine surf forecast from 15 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 8PM (local time) - 1ft (0.3m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 18 Aug, 8PM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 58 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 8PM (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 8PM. 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 cross-offshore as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.4m 13s and forecast to arrive on Tuesday (Aug 18) at 8PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 9s period and expected on Saturday (Aug 15) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Best Surf | 8PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Most Powerful | 8PM (Tue 18th Aug) | 1.5ft (0.4m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s be straight with you – this outlook for Sixtynine is a tough one. The whole 16-day window is pretty much a write-off for any decent surf, so don’t get your hopes up. There’s barely a pulse out there, with combined swell energy dribbling along in the weak range, mostly under 100 (values like 25–74). The water temperature is sitting at 81°, which is about 1° warmer than average for this time of year – nothing to write home about, just your typical warm bath.
Starting from Saturday the 15th, we’ve got a tiny 1 ft swell from the west with a period of 11 seconds, but a fresh breeze from the east-northeast is making it cross-off. It’s clean, but honestly, it’s just poor surf – barely worth a paddle. Saturday afternoon gets hammered by a severe gale, so forget it. Sunday the 16th is a bit of nothing with onshore winds and a 1 ft–1 ft west-northwest swell, but the wind is on it, spoiling any chance of shape.
Monday the 17th morning has glassy conditions with a 1 ft west-northwest swell, but it’s still tiny and weak. Tuesday and Wednesday are more of the same – glassy or clean, but the swell never gets above 1 ft, and the energy is pathetic. Thursday the 20th brings a small 1 ft swell from the southwest with a longer period of 18 seconds, but cross-on winds ruin it.
The pattern continues through the rest of August, with little to no swell. By Sunday the 30th, we finally see a slight uptick – a 1 ft west-northwest swell with a 15-second period and glassy conditions, giving a combined energy of 74 (still weak). The report says “surfable waves but very ordinary conditions” – and that’s the best it gets, which tells you everything.
So there you have it – a long, flat stretch for Sixtynine. No standouts, no real hope. Time to find something else to do.
Rusty
Short Range ForecastHeavy rain (total 74mm), heaviest during Sat night. Warm (max 29°C on Sat morning, min 25°C on Sat night). Winds decreasing (severe gales from the ENE on Sat afternoon, calm by Sun morning). | Days 4-6 Weather SummarySome drizzle, heaviest during Thu night. Warm (max 28°C on Tue morning, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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 11 | NE 9 | NNE 8 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | SW 16 | SW 18 | SW 17 | WNW 11 | W 10 | SW 16 | W 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 0 | 0 | 32 | 49 | 27 | 25 | 25 | 25 | 25 | 25 | 33 | 48 | 28 | 41 | 49 | 47 | 11 | 9 | 39 | 8 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-on | on | on | glassy | glassy | cross | cross-off | cross-on | cross-off | glassy | glassy | glassy | glassy | cross-on | cross-on | glassy | on | glassy | glassy |
High Tide | 5:56PM0.60m | 6:49AM0.51m | 6:24PM0.51m | 7:40AM0.53m | 6:51PM0.41m | 8:37AM0.54m | 7:15PM0.33m | 9:44AM0.55m | 7:33PM0.25m | 10:59AM0.57m | 12:08PM0.59m | 11:45PM0.18m | |||||||||
Low Tide | 11:41AM0.09m | 00:29AM0.00m | 12:35PM0.16m | 00:54AM0.02m | 1:40PM0.21m | 1:21AM0.04m | 3:09PM0.25m | 1:51AM0.05m | 5:41PM0.25m | 2:31AM0.07m | 3:32AM0.09m | 8:34PM0.15m | |||||||||
 |  |  |  |  |  | | |  |  | | | | | | | | | | | | |
 | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — |
 | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — |
mm | 3 | 13 | 49 | — | 4 | 5 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — |
Temp °C | 29 | 28 | 27 | 29 | 29 | 28 | 28 | 28 | 26 | 28 | 27 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 27 | 25 | 30 | 33 | 33 | 33 | 32 | 33 | 29 | 31 | 31 | 29 | 32 | 32 | 31 | 31 | 32 | 32 | 31 | 31 | 32 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | NE 9 | NNE 8 | NE 8 | NE 8 | NE 7 | NE 6 | NE 6 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NE 5 | NE 6 | NNE 6 | NNE 6 | NE 6 | NNE 7 | NNE 7 | NNE 7 | NNE 7 |
| kJ | 35 | 763 | 106 | 78 | 86 | 64 | 45 | 39 | 17 | 15 | 15 | 8 | 21 | 24 | 35 | 26 | 10 | 34 | 33 | 33 | 31 |
Swell 2 Height (m) Direction Period (s) | W 11 | ENE 10 | SSW 10 | SW 6 | SW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 16 |
| kJ | 21 | 112 | 52 | 18 | 11 | 27 | 25 | 25 | 25 | 25 | 25 | 33 | 48 | 28 | 25 | 49 | 47 | 69 | 69 | 39 | 64 |
Swell 3 Height (m) Direction Period (s) | W 15 | NE 12 | ENE 9 | WNW 13 | WNW 12 | SW 5 | SW 5 | S 14 | NE 8 | ENE 8 | W 13 | ENE 7 | SSW 16 | NNE 7 | SW 16 | WNW 11 | WNW 11 | WNW 11 | W 10 | W 10 | W 10 |
| kJ | 4 | 40 | 31 | 32 | 49 | 4 | 1 | 16 | 9 | 6 | 14 | 5 | 26 | 9 | 41 | 24 | 23 | 11 | 9 | 9 | 8 |
Wind waves Height (m) Direction Period (s) | NE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NNE 4 | — | — | — | — |
| kJ | 401 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 7 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 29 | 39 | 29 | 31 | 92 | 84 | 88 | 94 | 94 | 88 | 94 | 76 | 5 | 29 | 3 | 5 | 3 | 5 | 8 | 84 | 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.
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