Surf Forecasts:
Rockpiles surf forecast from 21 Aug 2026:
- Best quality surf: Friday 21 Aug, 5PM (local time) - 2.5ft (0.7m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 716 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 5PM (local time) - 2.5ft (0.7m), 16s period with SW 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 Friday (Aug 21) at 5PM. The primary swell is predicted to be 0.7m and 16s period with a secondary swell of 0.9m and 7s. 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 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 6s period and expected on Monday (Aug 24) at 8AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Fri 21st Aug) | 2.5ft (0.7m) 16s |
| Best Surf | 5PM (Fri 21st Aug) | 2.5ft (0.7m) 16s |
| Most Powerful | 11AM (Thu 27th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what’s cookin’.
The kick-off on Friday, August 21st is pretty weak. We’re looking at a 2ft SW swell with a real long 17-second stretch, but the energy is low (291). The best chance is Friday afternoon at Rockpiles when the breeze goes light and cross-offshore, cleaning things right up. Just don’t expect any power behind it. Water temp is about what you’d expect for the season.
Then it gets ugly. From Saturday, August 22nd right through the end of the month, the wind is pumping out of the ENE at 19 to 25 mph. The energy builds (climbing from 422 to 1057), but that wind won’t quit. Saturday the 22nd shows clean conditions on paper, but the wind is too stout to call it good. The data says "poor surf conditions". It's a long stretch of blown-out, messy stuff. The swell tries to build to 6ft around the 30th, but the wind is still cranking, ruining that energy (1452).
The one bright spot – and I mean the only one worth getting up early for – is Saturday, September 5th. We get a tiny 2ft SW groundswell with a very long 19-second period, and here’s the kicker: light NE wind at 12 mph, cross-offshore. That means glassy, clean lines. For a reef like Rockpiles, that long period wraps in perfect. The energy is moderate (663), but the quality will be there for a patient surfer. Just remember that’s over a week away, so don’t book your flight yet.
After that, it goes nuts. September 1st throws a 10ft ENE swell with near gale-force winds. That’s only for the brave and the stupid. It drops back to 3ft by the 2nd, but the damage is done. The rest of the outlook fades out into nothing.
Honestly, this forecast is mostly a dud for decent paddle surfing. You’ve got Friday afternoon the 21st for a tiny clean wave, and then that Saturday the 5th is your real gamble. That’s the one to watch.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Fri morning, min 25°C on Sat night). Winds increasing (light winds from the ESE on Fri afternoon, strong winds from the ENE by Sun morning). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Mon morning, min 25°C on Mon morning). Mainly fresh winds. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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) | SW 17 | SW 16 | SSW 16 | SW 16 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | SSW 14 | SSW 13 | ENE 7 | E 7 | E 7 | ENE 7 | SSW 14 | S 18 | S 19 | S 17 | S 16 | S 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 291 | 261 | 322 | 261 | 255 | 348 | 327 | 239 | 218 | 166 | 172 | 187 | 251 | 238 | 227 | 215 | 304 | 351 | 716 | 422 | 482 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | 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 | 12:25PM0.59m | 00:08AM0.21m | 1:12PM0.63m | 1:06AM0.23m | 1:52PM0.66m | 1:46AM0.26m | 2:26PM0.67m | 2:21AM0.29m | 2:56PM0.68m | 2:55AM0.33m | 3:24PM0.68m | 3:31AM0.37m | 3:53PM0.66m | 4:08AM0.41m | |||||||
Low Tide | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | 6:08AM0.10m | 9:18PM0.14m | 6:59AM0.08m | 9:35PM0.13m | 7:43AM0.06m | 9:53PM0.11m | 8:24AM0.05m | 10:12PM0.10m | 9:05AM0.06m | 10:32PM0.08m | ||||||||
 | |  | | | | | |  |  | | | | | | | | | | | | |
 | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — |
 | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 27 | 27 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 31 | 31 | 29 | 26 | 24 | 23 | 22 | 22 | 22 | 24 | 24 | 25 | 25 | 24 | 23 | 22 | 23 | 23 | 23 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 17 | ENE 7 | SSW 16 | SW 16 | SW 16 | SSW 16 | SSE 13 | SSW 15 | SW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 19 | S 17 | S 16 | S 16 |
| kJ | 291 | 81 | 322 | 261 | 255 | 212 | 99 | 191 | 100 | 166 | 156 | 127 | 85 | 142 | 121 | 215 | 304 | 351 | 716 | 422 | 482 |
Swell 2 Height (m) Direction Period (s) | NNE 7 | SW 16 | NE 7 | W 10 | W 10 | S 14 | SW 15 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 12 | SSW 16 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 | E 18 | E 16 | E 15 |
| kJ | 41 | 261 | 54 | 50 | 53 | 104 | 116 | 58 | 56 | 50 | 48 | 46 | 146 | 81 | 56 | 165 | 135 | 137 | 152 | 262 | 362 |
Swell 3 Height (m) Direction Period (s) | E 8 | W 10 | W 10 | S 12 | S 12 | WNW 10 | SSW 15 | WNW 12 | SSW 15 | SSW 18 | SSE 8 | SSW 17 | SSE 12 | SSE 6 | SSW 18 | SSE 12 | SSE 12 | SSW 16 | N 8 | SSW 12 | W 11 |
| kJ | 30 | 49 | 50 | 47 | 47 | 34 | 76 | 26 | 71 | 62 | 11 | 94 | 29 | 14 | 109 | 14 | 14 | 87 | 6 | 47 | 9 |
Wind waves Height (m) Direction Period (s) | — | — | E 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | E 7 | E 7 | ENE 7 | ENE 6 | ENE 6 | E 6 | ENE 6 | ENE 7 | ENE 6 |
| kJ | — | — | 47 | 166 | 225 | 348 | 327 | 239 | 218 | 171 | 172 | 187 | 251 | 238 | 227 | 194 | 153 | 182 | 144 | 189 | 212 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 30 | 32 | 41 | 38 | 39 | 41 | 30 | 38 | 32 | 30 | 31 | 32 | 30 | 31 | 38 | 30 | 31 | 32 | 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.
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