Surf Forecasts:
Sixtynine surf forecast from 4 Aug 2026:
- Most powerful swell: Monday 10 Aug, 5AM (local time) - 1.5ft (0.4m), 11s period, W swell with 37 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 11s and forecast to arrive on Monday (Aug 10) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 7s period and expected on Sunday (Aug 09) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Mon 10th Aug) | 1.5ft (0.4m) 11s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break it down.
Plain and simple, the first ten days are a bust. From Monday the 3rd of August all the way through Tuesday the 11th, we’re looking at flat to tiny surf with no energy. It’s a long stretch of nothing. The waves are barely there, and the conditions are mostly poor.
We finally get a pulse on Wednesday the 12th with a moderate energy reading of 107 (0.5ft swell from the W, 14s period) and light cross-shore wind. It’s a glimmer. The real standout comes Thursday the 13th into Friday the 14th. Thursday afternoon sees a 0.6ft swell from the W with a 18s period and a combined energy of 225 – that’s a proper groundswell. And the wind? Glassy. That’s your best bet. Water temp is 81°, which is about normal for this time of year.
With that super long 18-second period, expect clean, lined-up waves but with longer waits between sets. It’s a point break, so it’ll handle that well. Friday the 14th brings a slightly bigger 0.8ft swell from the WNW, 16s period, and a combined energy of 358 – that’s strong energy. The wind is light cross-onshore, so not perfect, but still surfable.
After that, it fades out again. So, keep your eyes on Thursday the 13th afternoon and Friday the 14th. That’s your window.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Mon afternoon, min 25°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Fri afternoon, min 24°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | ||||||||||||||
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 12 | W 12 | N 6 | W 11 | W 13 | W 13 | W 12 | W 12 | W 12 | W 12 | SSW 14 | W 12 | W 12 | NE 8 | NE 7 | NNE 6 | W 13 | W 12 | W 11 | W 11 |
Wave Graph  | ||||||||||||||||||||
 kJ | 10 | 11 | 6 | 10 | 12 | 28 | 11 | 11 | 11 | 12 | 0 | 11 | 11 | 0 | 0 | 0 | 29 | 25 | 22 | 23 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | on | glassy | glassy | glassy | on | glassy | on | glassy | cross-off | cross-on | glassy | glassy | cross | cross-off | glassy | on | cross | glassy |
High Tide | 6:56PM0.51m | 8:43AM0.52m | 7:30PM0.41m | 9:54AM0.57m | 8:12PM0.32m | 11:08AM0.63m | 9:29PM0.23m | 12:16PM0.69m | 11:28PM0.19m | 1:16PM0.76m | 1:00AM0.19m | 2:08PM0.80m | 2:05AM0.23m | |||||||
Low Tide | 1:44AM-0.00m | 2:34PM0.25m | 2:20AM-0.00m | 4:37PM0.27m | 3:05AM-0.01m | 6:57PM0.22m | 4:04AM-0.01m | 8:13PM0.15m | 5:14AM-0.02m | 8:57PM0.09m | 6:24AM-0.04m | 9:32PM0.05m | ||||||||
 |  |  | | | | | | | | | | |  | | | | |  |  | |
 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — |
 | 6:59 | — | — | 6:58 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 1 |
Temp °C | 28 | 26 | 28 | 28 | 26 | 28 | 28 | 26 | 28 | 27 | 26 | 28 | 29 | 26 | 28 | 28 | 27 | 29 | 27 | 27 |
Feels °C | 30 | 30 | 30 | 31 | 29 | 31 | 30 | 30 | 31 | 31 | 29 | 30 | 32 | 29 | 30 | 30 | 30 | 33 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | NNE 6 | N 6 | ENE 11 | NNE 6 | ENE 10 | NE 9 | NNE 5 | NNE 5 | NE 5 | NE 5 | NE 4 | NE 4 | NE 6 | NNE 5 | NE 7 | NE 10 | NE 6 | NE 7 | NE 7 | NNE 5 |
| kJ | 20 | 18 | 47 | 20 | 39 | 22 | 19 | 9 | 16 | 28 | 10 | 10 | 60 | 19 | 35 | 14 | 54 | 82 | 82 | 22 |
Swell 2 Height (m) Direction Period (s) | NE 8 | ENE 11 | N 6 | ENE 11 | NNE 6 | W 13 | NE 9 | NE 8 | NE 8 | NE 8 | NE 8 | NE 9 | W 12 | NE 8 | NE 10 | SSW 18 | SSW 18 | W 12 | W 11 | NE 7 |
| kJ | 17 | 48 | 6 | 46 | 10 | 28 | 20 | 11 | 10 | 9 | 9 | 14 | 11 | 14 | 14 | 31 | 30 | 25 | 22 | 27 |
Swell 3 Height (m) Direction Period (s) | W 12 | W 12 | NE 6 | W 11 | W 13 | NNE 9 | W 12 | W 12 | W 12 | W 12 | SSW 14 | W 12 | SSW 13 | SSW 13 | SSW 18 | SSW 13 | W 13 | SSW 16 | SSW 12 | W 11 |
| kJ | 10 | 11 | 6 | 10 | 12 | 8 | 11 | 11 | 11 | 12 | 20 | 11 | 18 | 17 | 32 | 17 | 29 | 26 | 15 | 23 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | NNE 5 | — | — | — | — | — | — | — | — | — | NNE 6 | — | — | — | — |
| kJ | — | — | — | — | — | 10 | — | — | — | — | — | — | — | — | — | 57 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 88 | 31 | 88 | 38 | 38 | 88 | 88 | 41 | 88 | 57 | 38 | 88 | 88 | 38 | 94 | 38 | 38 | 84 | 38 | 42 |
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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