
Surf Forecasts:
Rockpiles surf forecast from 9 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 2PM (local time) - 11ft (3.5m), 13s period, ENE swell with 4,072 kJ wave energy.
Best Forecast Surf Conditions for Rockpiles this week:
The most powerful waves expected at Rockpiles in the next 16 days are 3.5m 13s and forecast to arrive on Sunday (Aug 16) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sun 16th Aug) | 11ft (3.5m) 13s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let’s talk about the waves on the horizon.
The next week is going to be a bit of a grind for us, to be honest. We’re looking at a stretch of marginal surf, with the wind stuck in a cross-off pattern that’s keeping things clean but the swell just isn’t putting in the work. Don’t get me wrong, it’ll be knee to waist-high and might catch a stray ripple, but nothing that’ll get the heart racing. We’re talking about a solid 5 to 6 day lull where the ocean is just kind of flat and uninspired. It’s a waiting game.
The first real sign of life doesn't show up until Saturday the 16th. That’s when we see a proper pulse of energy arrive. Out of nowhere, the energy reading jumps to 3486, and by the afternoon it’s a strong 4836. This is the standout of the whole fortnight. We’re looking at a swell building from 8ft to 12ft, coming from the ENE with a period of 13 seconds. That’s some serious, long-period groundswell energy. For Rockpiles (a reef setup), this is what we live for. The waves will be powerful, and with the wind turning offshore on Sunday afternoon, it should be absolutely glassy and perfect.
This is advanced territory, no doubt. 12ft of solid groundswell is not for the faint of heart; this is strictly for the experienced crew. The water temp is a warm 81°, which is about average for this time of year, so you’ll be comfortable in boardshorts and a rashie.
Before that, there’s a tiny tease on Tuesday the 12th with a long-period S swell, but it’s just not enough size to be worthwhile. And after Sunday’s big day, the swell backs down and the wind turns onshore, chopping things up by Monday the 17th. After that, it looks like we’re back to a similar pattern of small, clean but weak surf leading into the following weekend, with another chest-high pulse showing up around Thursday the 21st and into the weekend. That could be a fun one, but it's a long way out, so take it with a grain of salt.
So, mark your calendars for Sunday the 16th. It’s the one day where everything lines up. Get on it early, and get the good ones.
- Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Mon morning, min 25°C on Sun morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 25°C on Wed morning). Mainly fresh winds. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | ENE 8 | ENE 9 | ENE 11 | ENE 11 | E 13 |
Wave Graph | |||||||||||||||||||||
225 | 305 | 310 | 220 | 246 | 214 | 181 | 269 | 276 | 509 | 498 | 520 | 501 | 653 | 537 | 411 | 411 | 617 | 1111 | 1456 | 2914 | |
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-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:10PM0.78m | 2:02AM0.22m | 2:54PM0.80m | 2:55AM0.26m | 3:35PM0.79m | 3:43AM0.31m | 4:13PM0.75m | 4:30AM0.36m | 4:48PM0.69m | 5:17AM0.40m | 5:22PM0.62m | 6:06AM0.44m | 5:54PM0.53m | ||||||||
Low Tide | 9:40PM0.08m | 7:20AM-0.02m | 10:10PM0.06m | 8:15AM-0.02m | 10:40PM0.05m | 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 | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:05 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 26 |
Feels °C | 25 | 24 | 26 | 26 | 25 | 25 | 25 | 23 | 24 | 23 | 23 | 25 | 25 | 24 | 24 | 24 | 23 | 25 | 25 | 25 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 17 | SSW 12 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | E 13 |
186 | 86 | 223 | 184 | 176 | 186 | 165 | 269 | 243 | 509 | 498 | 520 | 501 | 653 | 537 | 411 | 411 | 302 | 280 | 219 | 2914 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 11 | SSE 9 | SSW 11 | SE 9 | S 20 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | W 12 | W 11 | W 12 | W 12 | E 12 | W 11 | W 13 | S 13 |
96 | 102 | 56 | 56 | 42 | 17 | 41 | 20 | 276 | 218 | 218 | 222 | 150 | 11 | 10 | 11 | 11 | 106 | 21 | 28 | 215 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSW 18 | W 11 | SSE 10 | SSE 10 | SSW 11 | SE 9 | S 21 | SSE 9 | W 13 | W 12 | W 12 | W 12 | SW 19 | SW 18 | SW 18 | SSW 18 | W 11 | NNW 8 | S 19 | S 18 |
19 | 102 | 20 | 19 | 18 | 23 | 21 | 79 | 7 | 30 | 25 | 25 | 11 | 14 | 13 | 12 | 30 | 21 | 7 | 65 | 99 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 11 | ENE 11 | ENE 13 |
225 | 305 | 310 | 220 | 246 | 214 | 181 | 163 | 160 | 182 | 176 | 165 | 195 | 233 | 293 | 349 | 388 | 617 | 1111 | 1456 | 1467 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 30 | 30 | 30 | 30 | 1 | 30 | 30 | 1 | 31 | 127 | 30 | 30 | 127 | 30 | 30 | 33 | 30 | 32 | 127 | 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.











