Surf Forecasts:
Rockpiles surf forecast from 17 Aug 2026:
- Best quality surf: Thursday 20 Aug, 2PM (local time) - 2ft (0.6m), 18s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 2AM (local time) - 6ft (1.8m), 8s period, ENE swell with 418 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 2PM (local time) - 2ft (0.6m), 18s period with SSW swell.
Best Forecast Surf Conditions for Rockpiles this week:
The surf forecast for Rockpiles over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 2PM. The primary swell is predicted to be 0.6m and 18s period with a secondary swell of 0.7m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Rockpiles in the next 16 days are 1.8m 8s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 6s period and expected on Wednesday (Aug 19) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Thu 20th Aug) | 2ft (0.6m) 18s |
| Best Surf | 2PM (Thu 20th Aug) | 2ft (0.6m) 18s |
| Most Powerful | 2AM (Mon 17th Aug) | 6ft (1.8m) 8s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright, mate, Rusty here. Let’s have a look at what’s on the cards for the next couple of weeks.
Right off the bat, I gotta be straight with you – the first week is a tough one. We’ve got a fair bit of onshore wind and the swell is mostly short-period, wind-driven stuff. The water temp is sitting around average for this time of year, so nothing wild there. The real standout, and the only spot I’d even bother paddling out at, is Rockpiles. It’s a reef break, exposed to the SSE swell, which is a good thing. The best action looks to be from Thursday afternoon, 20th August, through to Saturday morning, 22nd August. We’ve got a solid S/SW groundswell rolling in, with a long period of 16 to 18 seconds. That means proper energy and shape – the combined energy is moderate (around 254 to 405). The wind is a light cross-off or cross-shore, keeping things clean. On Thursday afternoon, the swell is around 2ft from the SSW, but with that long period, it’ll pack a punch. It’s small, but it’ll be lined up. Friday and Saturday mornings look even better, with the swell nudging up to 2ft, same direction, and the wind easing off to a light breeze. Crowds are possible, so get in early.
Now, after that Saturday morning session, the quality drops off a cliff. From Sunday, 23rd August, we’ve got a run of poor surf – the wind swings back to a fresh ENE breeze, and the swell becomes a short-period, lumpy ENE windswell. This is a 4-day gap of nothing worth writing home about. The combined energy drops, and we’re looking at messy, blown-out conditions.
Then, from Wednesday, 26th August, things get interesting again, but this is for the *advanced crew only*. The swell builds rapidly, hitting 8ft on Wednesday, then 10ft from Thursday, 27th August, through to Saturday, 29th August. That’s serious size – over 8ft is expert territory. The swell direction is ENE, and the period stays short at 8 seconds, so it’s not the cleanest groundswell. The combined energy jumps into the strong range (1298 to 2697). The wind is a cross-off, but it’s a fresh 15 to 19 mph, keeping the surface bumpy. This is big, raw, wind-affected surf. Not for the faint-hearted.
By Saturday afternoon, 29th August, the swell drops back down to 3ft, and conditions turn poor again. The final week is a mixed bag of short-period windswell and some better SSW pulses, but nothing that really screams “paddle out.”
The Best Bet: If you’re a confident surfer, the Thursday 20th to Saturday 22nd August window is the pick – small but clean, with long-period groundswell at Rockpiles. For the big wave hunters, the 27th to 29th August is a serious, heavy swell window, but it’s raw and rough.
Stay safe out there.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Sun night. Warm (max 26°C on Sun night, min 24°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat morning, min 24°C on Thu night). Wind will be generally light. | ||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
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) | ENE 8 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | E 8 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 |
Wave Graph | |||||||||||||||||||
418 | 334 | 260 | 170 | 141 | 147 | 147 | 137 | 100 | 129 | 207 | 200 | 274 | 291 | 264 | 322 | 261 | 255 | 212 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 7:54AM0.49m | 6:52PM0.37m | 8:59AM0.51m | 7:16PM0.30m | 10:13AM0.53m | 11:25AM0.56m | 10:11PM0.21m | 12:25PM0.59m | 00:08AM0.21m | 1:12PM0.63m | 1:06AM0.23m | ||||||||
Low Tide | 00:58AM0.06m | 1:59PM0.25m | 1:27AM0.08m | 3:56PM0.27m | 2:01AM0.10m | 2:47AM0.12m | 8:27PM0.20m | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | |||||||||
— | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
7:00 | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | |
mm | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 27 | 26 | 24 | 24 | 23 | 24 | 25 | 24 | 26 | 26 | 27 | 27 | 28 | 28 | 28 | 29 | 29 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | S 14 | S 14 | S 13 | ENE 7 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | NE 7 | ENE 7 | SW 16 | ENE 6 | SSW 16 |
418 | 334 | 260 | 170 | 141 | 119 | 116 | 137 | 86 | 63 | 58 | 54 | 75 | 93 | 69 | 76 | 261 | 127 | 212 | |
Swell 2 Height (m) Direction Period (s) | SSE 7 | S 6 | SSE 5 | SW 6 | S 13 | SW 18 | SW 18 | SW 16 | SSW 16 | NE 6 | NE 6 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | E 8 | SW 16 | SSE 12 |
75 | 23 | 6 | 10 | 121 | 80 | 79 | 129 | 100 | 32 | 32 | 200 | 274 | 291 | 264 | 322 | 20 | 255 | 50 | |
Swell 3 Height (m) Direction Period (s) | S 14 | SW 18 | SSW 5 | W 11 | SW 17 | W 13 | W 12 | NNE 7 | S 12 | SW 16 | SSW 18 | NNE 6 | E 8 | S 11 | E 8 | S 13 | S 12 | S 12 | SSE 8 |
250 | 50 | 5 | 10 | 74 | 31 | 25 | 18 | 45 | 129 | 207 | 27 | 19 | 21 | 12 | 54 | 47 | 47 | 13 | |
Wind waves Height (m) Direction Period (s) | — | ENE 8 | ENE 7 | ENE 7 | — | ENE 7 | ENE 8 | — | NNE 6 | — | — | — | — | — | — | E 6 | ENE 6 | — | ENE 7 |
— | 250 | 237 | 167 | — | 147 | 147 | — | 26 | — | — | — | — | — | — | 49 | 75 | — | 186 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 39 | 30 | 30 | 1 | 30 | 1 | 1 | 30 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 1 | 0 | 1 | 1 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Rockpiles Surf forecast
The above surf forecast table for Rockpiles provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Rockpiles can be found by selecting the local surf guide option on the grey menu. Our Rockpiles 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 (Rockpiles) 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 Rockpiles 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.
Rockpiles is 4 km (2 miles) from Honolulu. If you plan a vacation in Oahu, look for hotels and other accommodation in Honolulu. Honolulu has rooms for a wide range of budgets as well as car hire and transport links.











