Surf Forecasts:
Sixtynine surf forecast from 15 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 5PM (local time) - 1ft (0.3m), 16s period, SW swell with glassy winds.
- Most powerful swell: Tuesday 18 Aug, 5PM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 58 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 5PM (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 5PM. 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 glassy 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 5PM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 4.0m 8s period and expected on Saturday (Aug 15) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Best Surf | 5PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Most Powerful | 5PM (Tue 18th Aug) | 1.5ft (0.4m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, let’s have a look at what’s coming our way.
Honestly, the next 16 days at Sixtynine are pretty flat and quiet. There’s no real swell of any consequence to get excited about for a long stretch, and what little shows up is small and weak. The water temp is sitting at 81°, which is about average for this time of year, so no surprises there.
We kick off on Friday the 14th with tiny 1ft W swell at 12 seconds but the wind is a cross-off from the NE at 12 mph and combined wave energy is weak (24). It’s clean, but just too small to bother with. Saturday the 15th is even smaller with 0.7ft W swell and a building near gale wind in the afternoon – forget it. Sunday the 16th, the morning is still small and cross-on, but the afternoon offers a brief moment of glassy conditions with the swell pushing 1ft from the WNW at 12 seconds and energy up to (83). It’s only surfable, not good, but it’s the first little window.
From Monday the 17th through most of the following week, conditions are mostly glassy or light wind, but the swell is tiny – 1ft to 1ft – and energy is in the weak range (24 to 56). The last few days of August bring a slight bump. On Friday the 28th, we see 2ft from the W at 12-13 seconds with energy reaching moderate (117) in the morning, but the wind is onshore. The afternoon of the 28th is glassy with calm wind, same 2ft W swell at 12 seconds and energy at (112). This is the best we get – still small but clean. Saturday the 29th has similar sized swell but a light cross-onshore in the morning, and glassy in the afternoon with 2ft and energy dropping to (75). The swell direction (W) matches the optimum (WNW) well enough, and with glassy conditions, it’s the standout window, but it’s really only for those who are happy on a longboard or a foiled-out board.
There are long gaps with nothing rideable, especially from the 21st to the 24th where the energy is zero. This is just one of those quiet runs for Sixtynine – it can happen. The only advice is keep an eye on the 28th afternoon if you’re desperate for a paddle.
Rusty
Short Range ForecastHeavy rain (total 70mm), heaviest during Sat afternoon. Warm (max 29°C on Sat morning, min 26°C on Sat night). Mainly stormy winds. | Days 5-7 Weather SummarySome drizzle, heaviest during Thu afternoon. Warm (max 28°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 12 | W 14 | W 14 | SSW 10 | WNW 13 | WNW 12 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 13 | WNW 12 | SW 16 | SW 16 | SW 18 | SW 17 | W 11 |
Wave Graph  | |||||||||||||||||||
 kJ | 12 | 16 | 16 | 0 | 32 | 29 | 27 | 25 | 25 | 25 | 25 | 58 | 33 | 48 | 42 | 41 | 49 | 47 | 9 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | glassy | on | glassy | glassy | glassy | cross | cross-off | glassy | glassy | glassy | glassy | glassy | glassy | on | cross | glassy |
High Tide | 6:01AM0.48m | 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 | ||||||||
Low Tide | 00:02AM-0.01m | 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 | |||||||
 |  |  |  |  | | |  | |  | | | | | | | | | | |
 | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | 6:52 | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — |
mm | 15 | 3 | 21 | 25 | 1 | 3 | 1 | — | 1 | — | — | — | — | — | — | — | — | 1 | — |
Temp °C | 27 | 29 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 27 | 26 | 27 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 25 | 24 | 23 | 31 | 31 | 32 | 32 | 33 | 33 | 31 | 32 | 31 | 30 | 31 | 32 | 31 | 32 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 13 | SSW 13 | NE 8 | NE 8 | NE 8 | NE 7 | NE 6 | NE 6 | NNE 5 | NNE 5 | NNE 5 | NNE 5 | NE 5 | WNW 12 | NNE 6 | NNE 6 | NNE 6 | NNE 7 |
| kJ | 36 | 35 | 35 | 151 | 80 | 77 | 65 | 46 | 51 | 18 | 15 | 17 | 9 | 12 | 28 | 26 | 27 | 16 | 33 |
Swell 2 Height (m) Direction Period (s) | W 12 | W 11 | W 11 | SSW 10 | SSW 7 | SW 6 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 13 | WNW 13 | WNW 12 | SW 16 | WNW 11 | SW 18 | SW 17 | SW 16 |
| kJ | 11 | 9 | 10 | 151 | 30 | 13 | 27 | 25 | 25 | 25 | 25 | 58 | 33 | 48 | 42 | 25 | 49 | 47 | 69 |
Swell 3 Height (m) Direction Period (s) | SW 17 | W 14 | W 14 | ENE 9 | WNW 13 | WNW 12 | SW 5 | S 12 | S 14 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | SSW 16 | NNE 7 | SW 16 | WNW 11 | WNW 11 | W 11 |
| kJ | 12 | 16 | 16 | 47 | 32 | 29 | 4 | 11 | 16 | 6 | 6 | 6 | 5 | 26 | 9 | 41 | 24 | 12 | 9 |
Wind waves Height (m) Direction Period (s) | NE 7 | NE 8 | NE 8 | — | — | — | — | — | — | — | — | — | — | — | NE 5 | — | — | NNE 4 | — |
| kJ | 322 | 532 | 2016 | — | — | — | — | — | — | — | — | — | — | — | 20 | — | — | 12 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 29 | 29 | 42 | 3 | 30 | 31 | 43 | 88 | 88 | 94 | 94 | 88 | 82 | 5 | 0 | 3 | 8 | 92 | 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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