Surf Forecasts:
Sixtynine surf forecast from 9 Aug 2026:
- Most powerful swell: Wednesday 12 Aug, 5PM (local time) - 1ft (0.3m), 13s period, WNW swell with 33 kJ wave energy.
Best Forecast Surf Conditions for Sixtynine this week:
The most powerful waves expected at Sixtynine in the next 16 days are 0.3m 13s and forecast to arrive on Wednesday (Aug 12) at 5PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 5.0m 8s period and expected on Saturday (Aug 15) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Wed 12th Aug) | 1ft (0.3m) 13s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's break down what's happening at Sixtynine.
It's looking like a pretty flat start. There's no surf to speak of for the first week, from Saturday, August 8th through to Friday, August 15th. The water's sitting at 81°, a bit warmer than average for the season, but that's about the only highlight for a while.
The first little bump shows up on Saturday morning, August 16th. A tiny 2ft swell from the SW, but with a short 7-second period and thunderstorms possible. The combined energy is weak (84), and the onshore breeze won't help. Not worth paddling out for.
Things get a bit more interesting around Tuesday, August 19th. The morning brings a 1ft WNW swell with a 13-second period and a touch more energy (74). But the real standout is Tuesday afternoon. Glassy conditions, a 1ft WNW swell, 12-second period. It's small, but with that clean surface, you could snag a few smooth ones. It's an intermediate spot that's fairly exposed, so it might get a little busy.
After that, it's back to a slow run of small, weak swells through the end of the month. Keep your hopes pinned on the 19th for that clean, small wave window.
Rusty.
Short Range ForecastLight rain (total 2mm), mostly falling on Sun afternoon. Warm (max 29°C on Sat morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Tue afternoon, min 25°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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) | NE 10 | NE 6 | NE 6 | W 13 | W 12 | W 12 | W 11 | W 11 | W 10 | W 10 | W 12 | W 13 | W 11 | WNW 13 | WNW 12 | WNW 12 | NNE 6 | W 12 | W 12 | W 12 | W 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 0 | 0 | 0 | 28 | 25 | 23 | 21 | 21 | 18 | 8 | 25 | 29 | 22 | 33 | 28 | 28 | 0 | 11 | 10 | 12 | 12 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | on | on | glassy | cross-on | glassy | cross-off | cross | glassy | cross-off | cross | cross | cross-off | cross | cross | cross | cross | cross-off | cross-off |
High Tide | 1:16PM0.76m | 1:00AM0.19m | 2:08PM0.80m | 2:05AM0.23m | 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 | ||||||||
Low Tide | 8:57PM0.09m | 6:24AM-0.04m | 9:32PM0.05m | 7:27AM-0.07m | 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 | ||||||||
 | |  |  |  | | | | | | |  | | | | | | | | |  | |
 | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — |
 | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 29 | 29 | 27 | 29 | 28 | 27 | 29 | 29 | 27 | 28 | 29 | 26 | 29 | 29 | 26 | 28 | 28 | 26 | 29 | 29 | 28 |
Feels °C | 30 | 30 | 30 | 32 | 31 | 31 | 31 | 32 | 30 | 29 | 31 | 29 | 30 | 31 | 28 | 28 | 28 | 27 | 28 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | NE 10 | NE 10 | NE 6 | NE 7 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NE 6 | NNE 5 | SSW 13 | NNE 5 | SSW 13 | SSW 16 | NNE 6 | SSW 14 | SSW 14 | SSW 14 | SSW 13 |
| kJ | 25 | 15 | 42 | 46 | 40 | 32 | 51 | 61 | 31 | 38 | 46 | 17 | 32 | 37 | 32 | 48 | 49 | 70 | 41 | 40 | 35 |
Swell 2 Height (m) Direction Period (s) | SSW 18 | SSW 18 | SSW 18 | W 13 | W 12 | W 12 | W 11 | SSW 15 | W 10 | SSW 14 | SSW 14 | SSW 13 | NE 6 | SSW 13 | SSW 16 | WNW 12 | SSW 15 | W 12 | W 12 | W 12 | W 12 |
| kJ | 32 | 31 | 30 | 28 | 25 | 23 | 21 | 47 | 18 | 41 | 40 | 35 | 7 | 32 | 51 | 28 | 44 | 11 | 10 | 11 | 11 |
Swell 3 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 13 | NE 9 | NE 9 | SSW 12 | SSW 12 | W 11 | SSW 16 | W 10 | W 12 | W 13 | W 11 | WNW 13 | WNW 12 | SSW 12 | SSW 12 | S 18 | S 18 | SW 17 | SW 17 |
| kJ | 16 | 17 | 17 | 13 | 12 | 14 | 15 | 21 | 24 | 8 | 25 | 29 | 22 | 33 | 28 | 28 | 28 | 6 | 6 | 12 | 12 |
Wind waves Height (m) Direction Period (s) | NNE 5 | NE 6 | — | — | — | — | — | — | — | — | — | — | NNE 5 | — | NE 6 | NNE 6 | — | NE 6 | NE 6 | NE 7 | NE 8 |
| kJ | 15 | 44 | — | — | — | — | — | — | — | — | — | — | 15 | — | 46 | 57 | — | 77 | 214 | 516 | 1401 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 94 | 88 | 29 | 84 | 88 | 42 | 92 | 97 | 38 | 88 | 46 | 42 | 94 | 94 | 29 | 94 | 29 | 3 | 94 | 38 | 38 |
Best forecast wave conditions in Big Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Sixtynine surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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