Surf Forecasts:
Sixtynine surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 8PM (local time) - 6ft (1.8m), 14s period, WSW swell with glassy winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 6ft (1.9m), 14s period, WSW swell with 1,422 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 8PM (local time) - 3.5ft (1.0m), 12s 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 Sunday (Sep 06) at 8PM. The primary swell is predicted to be 1.0m and 12s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 1.9m 14s and forecast to arrive on Monday (Sep 07) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 11s period and expected on Sunday (Sep 06) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Sun 6th Sep) | 3.5ft (1.0m) 12s |
| Best Surf | 8PM (Mon 7th Sep) | 6ft (1.8m) 14s |
| Most Powerful | 11PM (Mon 7th Sep) | 6ft (1.9m) 14s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s get straight into it.
We’re looking at a pretty quiet spell for Sixtynine. The first few days are a write-off with no surf to speak of, just flat and glassy conditions. That changes on Monday, September 7th, when the ocean finally wakes up.
The standout is Monday morning, September 7th, at Sixtynine. We’ve got a 4ft swell rolling in from the SW, and it’s packing some serious energy – right around 532 (moderate energy). The period is a solid 14 seconds, which is a nice long groundswell, meaning better shaped waves and more power. The wind is glassy, dead calm from the WNW, so the surface will be clean as a whistle. Water temp is sitting at 82°, which is about normal for this time of year, nothing out of the ordinary. This is the best window by far – a real chance to get some good ones.
Monday afternoon sees the swell bump up to 6ft from the WSW, but the wind swings cross-on and the quality drops off. The energy jumps to 1158 (moderate to strong), but it’s a bit of a mess. Tuesday morning, September 8th, still has decent size at 6ft from the WSW, but the wind is onshore, so it’s gonna be lumpy. The energy is still strong at 872. By Tuesday afternoon, the swell shifts to 6ft from the W, but again, it’s onshore and not great.
After that, it fades fast. Wednesday morning, September 9th, drops to 2ft, and by the afternoon it’s tiny. From Thursday, September 10th, right through to the end of the forecast on September 20th, it’s mostly flat, with just a few tiny pulses of 0.3ft to 1ft from the SW – nothing worth paddling out for. There’s a long gap of no real surf from the 10th onwards.
If you’re gonna get wet, make it Monday morning, September 7th. That’s your only real shot.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun night. Warm (max 29°C on Mon afternoon, min 26°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 29°C on Thu afternoon, min 25°C on Wed night). Wind will be generally light. | |||||||||||||||||||
Sat 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | ||||||||||||||
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) | SSW 12 | SW 11 | SW 11 | SW 12 | SW 12 | SW 14 | WSW 15 | WSW 13 | WSW 12 | W 11 | W 10 | WNW 9 | W 7 | WNW 6 | SW 16 | SW 18 | SW 16 | SW 16 | SW 15 | SW 15 |
Wave Graph  | ||||||||||||||||||||
 kJ | 0 | 0 | 0 | 0 | 341 | 532 | 1158 | 1283 | 872 | 726 | 250 | 80 | 28 | 8 | 42 | 49 | 0 | 0 | 0 | 0 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | on | glassy | glassy | glassy | cross-on | glassy | on | on | glassy | on | cross-on | glassy | cross | on | glassy | on | glassy | glassy |
High Tide | 00:08AM0.19m | 12:59PM0.72m | 1:17AM0.24m | 1:49PM0.75m | 2:08AM0.31m | 2:32PM0.75m | 2:51AM0.39m | 3:10PM0.73m | 3:32AM0.46m | 3:45PM0.69m | 4:11AM0.53m | 4:16PM0.63m | 4:50AM0.58m | |||||||
Low Tide | 7:52PM0.09m | 5:12AM0.03m | 8:26PM0.06m | 6:29AM0.01m | 8:55PM0.03m | 7:32AM-0.01m | 9:22PM0.01m | 8:26AM-0.02m | 9:48PM-0.01m | 9:15AM-0.00m | 10:13PM-0.02m | 10:03AM0.02m | 10:37PM-0.02m | |||||||
 |  | |  |  | | | |  | | | | |  | | | | | | | |
 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | — | — | — | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 28 | 27 | 28 | 27 | 27 | 27 | 29 | 27 | 29 | 28 | 27 | 28 | 28 | 27 | 28 | 29 | 26 | 27 | 27 | 26 |
Feels °C | 32 | 31 | 31 | 31 | 32 | 31 | 33 | 31 | 33 | 31 | 32 | 32 | 32 | 31 | 30 | 31 | 30 | 28 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 12 | SW 11 | SW 11 | SW 12 | SW 12 | SW 14 | WSW 15 | WSW 13 | WSW 12 | W 11 | W 10 | WNW 9 | NE 7 | NE 7 | SW 8 | NE 7 | NNE 5 | NNE 8 | NE 5 | NNE 7 |
| kJ | 171 | 126 | 150 | 252 | 341 | 532 | 1158 | 1283 | 872 | 726 | 250 | 80 | 44 | 53 | 9 | 12 | 12 | 23 | 22 | 33 |
Swell 2 Height (m) Direction Period (s) | NNE 6 | NNE 6 | NE 6 | NE 6 | NNE 6 | NE 7 | NE 12 | NE 12 | NE 11 | NE 10 | SW 8 | NE 8 | W 7 | SW 8 | SW 16 | SW 18 | NE 8 | SW 16 | NNE 7 | ENE 11 |
| kJ | 49 | 34 | 38 | 66 | 26 | 52 | 236 | 228 | 165 | 113 | 66 | 50 | 28 | 14 | 42 | 49 | 31 | 65 | 21 | 23 |
Swell 3 Height (m) Direction Period (s) | ENE 14 | E 13 | E 12 | ENE 12 | ENE 12 | ENE 12 | SSW 16 | SSW 15 | SSW 15 | SW 9 | NE 8 | SW 8 | SW 8 | WNW 6 | WNW 10 | SW 8 | SW 16 | ENE 12 | SW 15 | SW 15 |
| kJ | 61 | 86 | 73 | 47 | 82 | 83 | 90 | 78 | 84 | 39 | 57 | 35 | 20 | 8 | 10 | 10 | 67 | 28 | 57 | 57 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | NE 7 | NNE 5 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 50 | 23 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 3 | 5 | 5 | 3 | 0 | 0 | 5 | 0 | 28 | 3 | 0 | 5 | 57 | 42 | 29 | 25 | 5 | 84 | 88 | 43 |
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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