Surf Forecasts:
Sixtynine surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 8PM (local time) - 1ft (0.3m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 23 Aug, 8AM (local time) - 1.5ft (0.5m), 11s period, WNW swell with 68 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 8PM (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 8PM. 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 cross-offshore as the swell arrives.
The most powerful waves expected at Sixtynine in the next 16 days are 0.5m 11s and forecast to arrive on Sunday (Aug 23) 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 7s period and expected on Monday (Aug 24) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Best Surf | 8PM (Wed 19th Aug) | 1ft (0.3m) 16s |
| Most Powerful | 8AM (Sun 23rd Aug) | 1.5ft (0.5m) 11s |
Table - best surf conditions forecast for Sixtynine over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what we’ve got cooking at Sixtynine.
First up, the water temp is sitting at 81°F with an anomaly of 1°F above normal, so pretty much what you’d expect for this time of year—no surprises there. Now, the bad news: we are looking at a serious dry spell. The first solid recommendation doesn’t really show up until Thursday the 20th, and even then it’s just “surfable but ordinary.” Before that, we’ve got days of tiny, weak swell with poor conditions. Tuesday the 18th and Wednesday the 19th are a write-off—1ft to 1ft of WNW swell with combined energies in the 20s and 30s (weak), plus offshore or glassy winds that would be a dream if there were any waves to ride, but there aren’t. It’s a real tease.
The first real glimmer comes Thursday afternoon, the 20th. We’re talking 1ft of SW groundswell with a period of 17 seconds—that’s a very long period, which means the energy is deep and the gaps between sets are long. Combined energy is still only 68 (weak), but the wind goes glassy, so if you’re patient and on a log, you might find a few clean little rollers. It’s not a standout, but it’s the best we’ve seen.
Then we hit a long, flat gap. From Friday the 21st through to Tuesday the 25th, it’s mostly flat or below 2ft with combined energies in the single digits to low 90s. There’s a bit of WNW windswell on Saturday the 22nd (2ft, 10 seconds, 91 energy), but the wind is cross-on, so it’s bumpy and poor. Not worth paddling out.
The next real chance comes on Wednesday the 26th. We finally see some pulse: 2ft to 3ft of SW swell, period 11 seconds, combined energy climbing to 121 and then 147 (moderate). That’s the most energy we’ve seen in the whole forecast. Wind is light and offshore or glassy on the 26th afternoon, so it could be clean. The direction is SW, which lines up with the optimum WNW at Sixtynine? No, it doesn’t. But for a protected spot, that long-period SW groundswell with light winds is your best shot. Thursday the 27th afternoon also looks tidy—2ft WSW, glassy, energy 99—surfable but still ordinary.
Friday the 28th afternoon is another glassy window with 2ft WSW swell, period 11 seconds, energy 91. Not big, but clean. The real standout? I’d say Wednesday the 26th afternoon into Thursday the 27th morning is the pick of the bunch. That’s where the swell is biggest, the energy is highest, and the wind is light. It’s still small—2ft to 3ft—so it’s fine for all levels, not too big for beginners.
From the 29th onward, it fades back to tiny 1ft to 2ft W windswell with periods dropping to 8-9 seconds and combined energy in the teens and twenties. Glassy afternoons on the 30th and 31st might give you a waist-high roll on a longboard, but it’s marginal.
Bottom line: the first week is mostly flat and frustrating. The second week offers a modest pulse around the 26th-28th, with the best conditions likely on Wednesday the 26th afternoon. Keep an eye on that window, but don’t expect a firing session—just a few clean, small waves if you’re keen.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Tue afternoon, min 25°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Fri night. Warm (max 29°C on Sat morning, min 25°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
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) | WNW 11 | WNW 11 | WNW 13 | WNW 12 | SW 16 | SW 16 | SW 18 | SW 17 | W 11 | WNW 10 | WNW 10 | W 10 | W 10 | W 10 | WNW 10 | SW 15 | WNW 10 | WNW 10 | NE 7 | W 9 | ENE 7 |
Wave Graph | |||||||||||||||||||||
25 | 25 | 33 | 48 | 42 | 41 | 49 | 47 | 20 | 36 | 33 | 56 | 54 | 52 | 59 | 45 | 20 | 9 | 0 | 2 | 0 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | cross-off | on | cross | glassy | on | glassy | glassy | on | glassy | glassy | cross-on | cross-on | glassy | cross | cross | cross-off | cross-off | glassy | glassy |
High Tide | 8:37AM0.54m | 7:15PM0.33m | 9:44AM0.55m | 7:33PM0.25m | 10:59AM0.57m | 12:08PM0.59m | 11:45PM0.18m | 1:04PM0.62m | 1:02AM0.20m | 1:49PM0.66m | 1:48AM0.23m | 2:26PM0.69m | 2:25AM0.28m | ||||||||
Low Tide | 3:09PM0.25m | 1:51AM0.05m | 5:41PM0.25m | 2:31AM0.07m | 3:32AM0.09m | 8:34PM0.15m | 8:53PM0.12m | 6:05AM0.06m | 9:13PM0.10m | 7:02AM0.04m | 9:33PM0.09m | ||||||||||
6:03 | — | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | 1 | — |
Temp °C | 27 | 28 | 26 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 26 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 27 |
Feels °C | 30 | 31 | 30 | 31 | 31 | 31 | 31 | 32 | 32 | 31 | 31 | 31 | 31 | 32 | 28 | 29 | 29 | 26 | 31 | 31 | 31 |
Swell 1 Height (m) Direction Period (s) | NNE 5 | WNW 11 | NNE 5 | NNE 5 | WNW 12 | NNE 6 | NNE 6 | NNE 7 | NNE 7 | NNE 7 | NE 7 | NE 7 | NE 6 | NE 6 | WNW 10 | WNW 11 | NNE 6 | SSW 14 | NE 7 | NE 7 | NNE 6 |
9 | 25 | 9 | 8 | 28 | 22 | 17 | 32 | 31 | 29 | 44 | 46 | 52 | 75 | 59 | 45 | 77 | 20 | 37 | 132 | 33 | |
Swell 2 Height (m) Direction Period (s) | NE 8 | W 13 | WNW 13 | WNW 12 | NNE 6 | WNW 11 | SW 18 | W 11 | SW 16 | WNW 10 | WNW 10 | W 10 | W 10 | W 10 | SW 15 | SW 15 | WNW 10 | WNW 10 | N 6 | SSW 13 | ENE 7 |
14 | 14 | 33 | 48 | 8 | 25 | 49 | 21 | 69 | 36 | 33 | 56 | 54 | 52 | 36 | 34 | 20 | 9 | 20 | 17 | 37 | |
Swell 3 Height (m) Direction Period (s) | WNW 11 | ENE 7 | ENE 7 | NNE 7 | SW 16 | SW 16 | WNW 11 | SW 17 | W 11 | SW 16 | SW 16 | SW 16 | SW 15 | SW 16 | WSW 9 | WSW 9 | SSW 14 | SW 9 | SSW 14 | W 9 | SSW 12 |
25 | 5 | 5 | 5 | 42 | 41 | 24 | 47 | 20 | 69 | 65 | 64 | 37 | 63 | 9 | 8 | 21 | 3 | 19 | 2 | 30 | |
Wind waves Height (m) Direction Period (s) | — | NNE 5 | — | — | NE 5 | — | — | — | — | — | — | — | — | — | NE 6 | NNE 6 | — | NNE 6 | — | — | — |
— | 15 | — | — | 11 | — | — | — | — | — | — | — | — | — | 31 | 69 | — | 44 | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 92 | 88 | 29 | 88 | 5 | 3 | 8 | 0 | 5 | 8 | 5 | 5 | 5 | 5 | 0 | 8 | 105 | 38 | 57 | 46 | 29 |
Best forecast wave conditions in Big Island | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











