Surf Forecasts:
Rockpiles surf forecast from 12 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 16ft (5.0m), 10s period, E swell with 5,514 kJ wave energy.
Best Forecast Surf Conditions for Rockpiles this week:
The most powerful waves expected at Rockpiles in the next 16 days are 5.0m 10s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 7s period and expected on Wednesday (Aug 19) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 16ft (5.0m) 10s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what’s on the menu for Rockpiles over the next couple of weeks.
Right off the bat, I’ve gotta be straight with you – the next week or so is a bit of a mixed bag, and not in a good way. We’ve got some swell, sure, but the wind is a constant battle. For the first few days, from Wednesday the 12th through to Friday the 14th, we’re looking at a clean, long-period SSW groundswell running around 3ft to 4ft, period pushing 15 to 18 seconds. That’s proper energy, with moderate wave energy readings around 800 to 900 (892). The water temp is sitting at 81°F, which is about normal for this time of year. The problem? That cross-offshore wind from the ENE is blowing a fresh breeze (19 to 22 mph). It’s clean on the face, but it’s gonna be a battle to get out. The scores are low, and honestly, it’s more of a grind than a joy.
Then we hit a real rough patch. Friday afternoon through to Sunday the 16th, the swell jumps up – we’re talking 10ft to 12ft from the ENE, with a short, choppy period around 8 to 10 seconds. The combined energy readings are massive – 2195 to 2904, that’s strong to very strong energy. But the wind is howling out of the NE at 28 to 34 mph, with thunderstorms on the cards. This is massive, raw, and messy. For the average surfer, this is a no-go. It’s big, blown out, and dangerous. Only the absolute experts with a death wish and a tow-in rig should even think about it, and honestly, this setup looks more interesting for kite surfing than paddle surfing.
After that storm blows through, Monday the 17th and Tuesday the 18th see the swell drop back to 5ft to 6ft, but the period is a sad 7 to 8 seconds. The wind is still a fresh cross-offshore breeze. It’s clean, but the wave quality is poor – weak, short-period windswell with no punch. The scores are a flat zero. A bit of a blank run, to be honest.
There’s a proper gap here. From Wednesday the 19th through to Saturday the 22nd, it’s the same story – small, short-period junk. The swell is tiny, 2ft to 5ft, with periods barely scraping 7 seconds, and the wind is still a moderate to fresh cross-offshore. The energy is weak (361 to 630). Not much to get excited about.
Now, here’s where it gets interesting. From Sunday the 23rd of August onwards, we start to see a change. The swell direction swings back to the SSW, and the period jumps up to 14 to 16 seconds. The size is a bit small, 2ft to 4ft, but it’s a proper groundswell. The wave energy is moderate (524 to 868). The wind is still ENE, cross-offshore, but it’s a bit lighter, a moderate to fresh breeze. The scores are still low, but you can see the quality starting to creep back in.
The standout in this whole outlook? It’s got to be the tail end of the run. Look at the 25th of August, Tuesday afternoon, and the 27th of August, Thursday afternoon. We’re seeing a 4ft to 3ft SSW groundswell, period 16 seconds, with a clean cross-offshore wind. The swell direction is right in the sweet spot for Rockpiles – it’s an exposed reef that loves SSE to SSW. The water is warm, the wind is clean, and the wave energy is moderate (868 to 862). It’s not huge, but it’s quality. For a reef break like Rockpiles, that long-period groundswell is going to reel down the line, offering up some nice, clean faces. Keep in mind, this is a fairly consistent spot, but it can get a bit crowded sometimes. It’s an advanced wave, so the crew out there will know what they’re doing. The biggest caveat is that this is a week and a half away, so it’s promising but less certain.
So, to wrap it up – the first week is a write-off for decent surf. Wait for that second week, from the 23rd onwards, and point your board towards the 25th and 27th. That’s where the real potential is.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu morning, min 25°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 39mm), heaviest during Sun morning. Warm (max 27°C on Sat afternoon, min 24°C on Sun morning). Winds decreasing (gales from the ENE on Sun morning, light winds from the E by Sun night). | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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) | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | ENE 7 | ENE 8 | ENE 7 | ENE 9 | E 9 | ENE 9 | E 10 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
509 | 498 | 890 | 501 | 662 | 537 | 443 | 477 | 637 | 1507 | 1949 | 2367 | 3017 | 1445 | 737 | 438 | 318 | 231 | 239 | 173 | 173 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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-off | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 4:13PM0.75m | 4:30AM0.36m | 4:48PM0.69m | 5:17AM0.40m | 5:22PM0.62m | 6:06AM0.44m | 5:54PM0.53m | 6:57AM0.47m | 6:24PM0.45m | 7:54AM0.49m | 6:52PM0.37m | 8:59AM0.51m | 7:16PM0.30m | ||||||||
Low Tide | 9:08AM-0.00m | 11:08PM0.04m | 9:58AM0.03m | 11:36PM0.04m | 10:49AM0.08m | 00:03AM0.04m | 11:43AM0.14m | 00:30AM0.05m | 12:43PM0.20m | 00:58AM0.06m | 1:59PM0.25m | 1:27AM0.08m | 3:56PM0.27m | 2:01AM0.10m | |||||||
6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 23 | 6 | 6 | 2 | 1 | — | — | — | — |
Temp °C | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 26 | 25 | 27 | 27 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 25 | 23 | 25 | 24 | 24 | 24 | 22 | 23 | 23 | 24 | 24 | 23 | 21 | 25 | 27 | 27 | 25 | 24 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | S 16 | SSE 8 | ENE 8 | S 14 | ENE 8 | S 13 | S 13 | S 13 | S 13 |
509 | 498 | 890 | 501 | 662 | 537 | 411 | 411 | 306 | 222 | 168 | 176 | 334 | 116 | 737 | 334 | 318 | 170 | 125 | 119 | 84 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | W 12 | SSW 12 | W 12 | W 11 | W 12 | W 12 | W 11 | W 11 | W 13 | S 18 | W 12 | S 13 | SSE 7 | S 6 | S 14 | SSE 5 | SW 17 | SW 18 | SSE 9 |
218 | 218 | 25 | 113 | 11 | 10 | 11 | 11 | 9 | 21 | 30 | 56 | 25 | 168 | 74 | 22 | 260 | 3 | 74 | 79 | 15 | |
Swell 3 Height (m) Direction Period (s) | W 13 | W 12 | SE 9 | W 12 | SW 19 | SW 18 | SW 18 | SSW 18 | SSW 17 | NW 8 | S 19 | W 13 | SSW 19 | S 16 | S 14 | SW 18 | S 6 | W 11 | SSE 8 | SSE 10 | SW 18 |
30 | 25 | 3 | 11 | 14 | 13 | 12 | 30 | 29 | 3 | 65 | 30 | 37 | 127 | 250 | 50 | 22 | 10 | 7 | 18 | 79 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 7 | ENE 8 | ENE 7 | ENE 9 | E 9 | ENE 9 | E 10 | ENE 9 | — | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
157 | 153 | 194 | 194 | 227 | 435 | 443 | 477 | 637 | 1507 | 1949 | 2367 | 3017 | 1445 | — | 438 | 214 | 231 | 239 | 173 | 173 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 127 | 30 | 31 | 127 | 31 | 44 | 127 | 44 | 200 | 200 | 200 | 209 | 59 | 45 | 30 | 39 | 30 | 30 | 31 | 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.











