Surf Forecasts:
Sixtynine surf forecast from 10 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 1.5ft (0.4m), 13s period, WNW swell with 57 kJ wave energy.
Best Forecast Surf Conditions for Sixtynine this week:
The most powerful waves expected at Sixtynine in the next 16 days are 0.4m 13s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 8s period and expected on Sunday (Aug 16) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 1.5ft (0.4m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here. Let me break it down for you.
We’re in for a pretty quiet run. The surf is on the small side, and for the next week and a half, there’s hardly anything to get excited about. Gotta wait it out.
The first proper pulse shows up on Wednesday, August 19th. Swell is around 1ft from the WNW, and the combined energy hits 88 (moderate). It’s glassy in the afternoon, so the surface will be clean. Not a lot of push, but it’ll be rideable on a log for the intermediate surfer.
Thursday, August 20th is the pick of the lot. The swell shifts to the SW and the period jumps to 17-18 seconds – that’s proper long-period groundswell. Combined energy is 87, with waves around 1ft. The wind goes glassy in the afternoon again. This long period stuff can be a little straight at times, but at *Sixtynine*, it should offer up some clean lines. It’s small, but the quality is there.
After that, the energy fades back to almost nothing. The first week is a blank. The water temperature is 27°C, just about average for this time of year.
So, Wednesday and Thursday of the second week are the only real windows. Thursday has the edge for a bit more power and shape.
Rusty.
Short Range ForecastSome drizzle, heaviest during Mon afternoon. Warm (max 29°C on Mon morning, min 24°C on Tue night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 52mm), heaviest during Sat afternoon. Warm (max 28°C on Thu morning, min 25°C on Thu night). Winds increasing (light winds from the NE on Thu morning, strong winds from the SW by Sat night). | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 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) | W 11 | W 11 | W 10 | W 10 | W 10 | W 11 | W 11 | WNW 13 | SSW 16 | WNW 12 | W 12 | W 12 | W 11 | W 12 | W 12 | WNW 11 | W 11 | WNW 13 | WNW 13 | WNW 12 | WNW 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 21 | 21 | 18 | 8 | 8 | 23 | 22 | 33 | 0 | 28 | 25 | 25 | 10 | 24 | 11 | 24 | 22 | 34 | 53 | 49 | 46 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross | cross-off | cross | glassy | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-on | glassy |
High Tide | 2:55PM0.83m | 2:57AM0.27m | 3:37PM0.84m | 3:45AM0.33m | 4:16PM0.81m | 4:30AM0.38m | 4:52PM0.76m | 5:16AM0.44m | 5:25PM0.69m | 6:01AM0.48m | 5:56PM0.60m | 6:49AM0.51m | 6:24PM0.51m | ||||||||
Low Tide | 10:05PM0.02m | 8:23AM-0.08m | 10:36PM0.00m | 9:15AM-0.06m | 11:06PM-0.01m | 10:03AM-0.03m | 11:35PM-0.01m | 10:52AM0.02m | 00:02AM-0.01m | 11:41AM0.09m | 00:29AM0.00m | 12:35PM0.16m | 00:54AM0.02m | ||||||||
 |  |  |  | |  | | | | | | | | | |  |  |  | | | | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | 6:03 | — | — | 6:03 | — | — |
 | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — |
mm | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 24 | 26 | 1 | 2 | — |
Temp °C | 29 | 29 | 27 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 27 | 28 | 26 | 26 | 26 | 26 | 30 | 29 | 27 |
Feels °C | 32 | 33 | 29 | 31 | 30 | 29 | 29 | 28 | 28 | 28 | 27 | 27 | 27 | 28 | 26 | 27 | 28 | 25 | 32 | 32 | 31 |
Swell 1 Height (m) Direction Period (s) | NE 6 | NE 6 | NNE 7 | NE 6 | NE 6 | NNE 5 | SSW 13 | NNE 5 | NE 5 | SSW 16 | NNE 6 | SSW 14 | NE 5 | SSW 14 | NE 8 | WNW 11 | NNE 6 | WNW 13 | NNE 8 | E 10 | NNE 7 |
| kJ | 31 | 33 | 32 | 43 | 31 | 17 | 32 | 34 | 30 | 48 | 39 | 70 | 42 | 40 | 69 | 24 | 41 | 34 | 123 | 55 | 84 |
Swell 2 Height (m) Direction Period (s) | W 11 | SSW 15 | W 10 | SSW 14 | SSW 14 | SSW 13 | W 11 | SSW 13 | SSW 16 | WNW 12 | SSW 15 | ENE 8 | SSW 14 | W 12 | SSW 14 | SSW 13 | NE 9 | ENE 10 | WNW 13 | WNW 12 | ENE 10 |
| kJ | 21 | 47 | 18 | 41 | 40 | 35 | 22 | 32 | 51 | 28 | 44 | 6 | 41 | 24 | 36 | 35 | 39 | 20 | 53 | 49 | 58 |
Swell 3 Height (m) Direction Period (s) | NE 8 | W 11 | SSW 15 | W 10 | W 10 | W 11 | NE 7 | WNW 13 | SSW 13 | SSW 12 | W 12 | W 12 | W 11 | SW 17 | W 12 | W 15 | W 11 | SSW 13 | ENE 11 | S 13 | WNW 12 |
| kJ | 10 | 21 | 23 | 8 | 8 | 23 | 7 | 33 | 32 | 14 | 25 | 25 | 10 | 12 | 11 | 4 | 22 | 17 | 38 | 13 | 46 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | NNE 5 | — | — | NNE 5 | — | NNE 5 | — | NNE 6 | — | NE 8 | — | NE 8 | — | NNE 7 | — |
| kJ | — | — | — | — | — | — | 12 | — | — | 36 | — | 37 | — | 57 | — | 135 | — | 138 | — | 114 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 94 | 97 | 38 | 88 | 46 | 38 | 39 | 94 | 29 | 38 | 38 | 29 | 45 | 41 | 41 | 92 | 82 | 161 | 28 | 28 | 29 |
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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