
Surf Forecasts:
Rockpiles surf forecast from 11 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 8AM (local time) - 2ft (0.6m), 13s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 5PM (local time) - 10ft (3.0m), 12s period, ENE swell with 2,732 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 8AM (local time) - 2ft (0.6m), 13s period with S 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 Tuesday (Aug 18) at 8AM. The primary swell is predicted to be 0.6m and 13s period with a secondary swell of 0.9m and 8s. Another secondary swell of 0.9m and 5s is also forecast. 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 3.0m 12s and forecast to arrive on Monday (Aug 17) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 12s period and expected on Monday (Aug 17) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Tue 18th Aug) | 2ft (0.6m) 13s |
| Best Surf | 8AM (Tue 18th Aug) | 2ft (0.6m) 13s |
| Most Powerful | 5PM (Mon 17th Aug) | 10ft (3.0m) 12s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright, this is Rusty, checkin’ in with the outlook for Rockpiles. This is a reef setup, so it handles swell well, but the wind’s gonna be the main conversation.
Water temp is sittin' at a comfortable 81°, which is pretty much bang on average for this time of year. Feels like home.
Right now, we’ve got a bit of a slow start. Tuesday morning (11th August) is super marginal, with a weak 4ft swell from the ENE at a short 7 seconds, and a cross-off wind that’s ok but not perfect. The energy is weak (403). Honestly, not much to write home about.
The pattern picks up a little through Wednesday (12th) and Thursday (13th), with a small S swell creepin' in, around 3ft to 4ft, and a period that gets longer, up to 14-18 seconds. That’s a groundswell, boys. It’s got some proper shape, but the wind stays a stiff cross-off from the ENE, around 18-22 mph, which will keep things a bit lumpy. Wave energy is moderate, around 814-884. It’s surfable, but it’s not gonna be a standout day.
Friday (14th) is similar, just a touch smaller. Then Saturday (15th) and Sunday (16th) see a new pulse from the ENE, but the swell gets bigger and the wind cranks up to 25-31 mph. The wave energy jumps to 1743-1762, which is strong, but that’s a messy, strong cross-off wind. The swell also gets shorter period, around 10-11 seconds, so it’s a bit of a windswell. For the advanced crew, the 8ft on Sunday morning might be worth a look, but it’s gonna be raw.
Now, the real standout is showing up on Monday, 17th August. The swell jumps to 10ft from the ENE with a 12-second period, and the wave energy is huge – 2567 to 2992. That’s proper power. The wind is cross-off from the east, 12-16 mph, which is manageable, and the afternoon session is cleaner. This is a big swell for the reef, and it’s gonna be a proper challenge. Only experts should be out there. It’s the best-looking day in the whole window.
After that, the swell drops off a cliff. Tuesday (18th) through to Friday (21st) is a mix of tiny 2ft to 3ft swells, mostly from the S or SSW, with poor energy, often under 300. The wind stays cross-off, but there’s just not enough juice. There’s a real gap of a few days here where the surf is pretty flat.
We get a tiny glimmer on Saturday, 22nd August. The swell is only 2ft to 2ft from the SSW, but the period is a solid 15-16 seconds, and the wind is light, 6-9 mph out of the NE. That’s a glassy, clean, long-period groundswell. It’s small, but if you’ve got a log, that’s a fun, clean little session. The energy is low (248-281), but the conditions will be sweet.
The rest of the week into late August is a waiting game. A few more pulses of S swell in the 2ft-5ft range, with some longer periods, but the wind is always a moderate to fresh cross-off. It’s consistent but not epic. The 25th and 26th see a bit more energy (up to 1366) and a 5ft, 17-18 second swell from the S, which is promising, but it’s a long way out.
So, to wrap it up: the standout is Monday, 17th August, for the big 10ft ENE groundswell. That’s the one for the big wave chargers. The rest of the window is a mix of small, clean days and windy, marginal stuff. Get on it if you can.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 27°C on Tue morning, min 25°C on Tue night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Sun night. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Winds increasing (fresh winds from the NE on Fri night, near gales from the NE by Sun night). | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | ENE 8 | ENE 8 | ENE 9 | ENE 10 | ENE 11 | ENE 11 | ENE 11 | ENE 11 | ENE 12 | ENE 12 | S 13 |
Wave Graph | |||||||||||||||||||||
181 | 269 | 276 | 509 | 498 | 520 | 501 | 662 | 537 | 411 | 411 | 472 | 547 | 925 | 1684 | 1456 | 1475 | 1720 | 2303 | 2732 | 170 | |
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 | cross-off | cross-off |
High Tide | 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 | 6:57AM0.47m | 6:24PM0.45m | 7:54AM0.49m | 6:52PM0.37m | ||||||||
Low Tide | 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 | 12:43PM0.20m | 00:58AM0.06m | 1:59PM0.25m | 1:27AM0.08m | |||||||
6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 8 | 5 | 2 | 3 |
Temp °C | 27 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 26 | 26 | 27 | 26 |
Feels °C | 26 | 26 | 23 | 24 | 24 | 23 | 24 | 24 | 24 | 23 | 24 | 24 | 24 | 24 | 24 | 23 | 22 | 20 | 26 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | ENE 7 | SSW 14 | 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 13 | S 13 | ENE 11 | ENE 12 | ENE 12 | NNE 10 |
165 | 136 | 243 | 509 | 498 | 520 | 501 | 662 | 537 | 411 | 411 | 306 | 222 | 219 | 222 | 155 | 160 | 1720 | 2303 | 2732 | 1450 | |
Swell 2 Height (m) Direction Period (s) | SSW 11 | SSW 14 | S 20 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | W 12 | W 11 | W 12 | W 12 | W 11 | E 11 | W 13 | S 18 | S 16 | S 16 | S 14 | S 14 | S 14 | S 13 |
41 | 269 | 276 | 218 | 218 | 222 | 113 | 11 | 10 | 11 | 11 | 21 | 94 | 30 | 56 | 132 | 127 | 246 | 264 | 260 | 170 | |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SE 9 | SSE 9 | W 13 | W 12 | W 12 | W 12 | SE 9 | SW 18 | SW 18 | SSW 18 | SSW 17 | W 11 | S 16 | W 13 | W 12 | W 12 | S 16 | W 11 | W 11 | W 11 |
16 | 20 | 7 | 30 | 25 | 25 | 11 | 3 | 13 | 12 | 30 | 29 | 9 | 42 | 30 | 45 | 25 | 81 | 21 | 21 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | — | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 | ENE 10 | ENE 11 | ENE 11 | ENE 11 | ENE 11 | — | — | SW 4 |
181 | — | 186 | 160 | 188 | 232 | 200 | 219 | 316 | 345 | 356 | 472 | 547 | 925 | 1684 | 1456 | 1475 | 1054 | — | — | 12 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 30 | 30 | 30 | 32 | 30 | 30 | 127 | 33 | 33 | 47 | 30 | 200 | 200 | 200 | 165 | 200 | 200 | 38 | 41 | 30 |
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.











