Surf Forecasts:
Rockpiles surf forecast from 21 Aug 2026:
- Best quality surf: Thursday 20 Aug, 5PM (local time) - 2ft (0.6m), 17s period, SSW swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 708 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5PM (local time) - 2ft (0.6m), 17s 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 5PM. The primary swell is predicted to be 0.6m and 17s period with a secondary swell of 1.1m and 7s. The wind is predicted to be glassy 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 1.4m 6s period and expected on Thursday (Aug 27) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| Best Surf | 5PM (Thu 20th Aug) | 2ft (0.6m) 17s |
| 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 folks, Rusty here. Let’s have a look at what’s cookin’ for Rockpiles over the next couple of weeks.
Right off the bat, Thursday morning the 20th is looking like a nice little windows. We’ve got a clean 2ft SSW swell pushin’ through with a super long period of 18 seconds – that’s proper groundswell energy. The wind is light and cross-off from the ENE at 6 mph, so the face should be tidy. The combined energy is reading 261 (moderate), and the water’s sittin’ at 80°, which is dead average for this time of year. That glassy Thursday afternoon sets up nicely too. This is the pick of the early run.
Friday the 21st stays small, with 2ft SW swell. The morning is a bit cross and ripply, but Friday afternoon turns glassy with the wind droppin’ out completely. That’s a serious bonus for clean conditions on a tiny wave. Worth a paddle if you’ve got a log.
Then we hit a rough patch. From Saturday the 22nd, right through the end of the month, the wind cranks up from the ENE at 18 to 28 mph – strong breeze territory. The swell on the 23rd and 24th jumps to 5ft - 6ft, but it’s short period windswell (7 seconds) and the energy readings are high (489 to 521), but the quality is poor. The surf just isn’t gonna be any fun for paddling. Frankly, with that wind and those numbers, it’s lookin’ more like a kite session than a surf session.
Things start to get interesting again around the 31st of August into early September. We see a solid 7ft ENE swell rollin’ in on Monday the 31st, with a period of 12 seconds and a huge combined energy of 1354 (very strong). But the wind is still up at 22-25 mph, keepin’ it choppy. It’s a marginal call at best.
The real standout, though, is lookin’ like Thursday the 3rd of September into Friday the 4th. Thursday morning shows a 7ft ENE swell (period 9 seconds) with the wind backing off to a gentle 9 mph – that’s a gorgeous cross-off. Energy is a massive 1397 (very strong). This is a powerful swell, pushin’ into the expert zone at over 7ft, but clean winds make it tempting. Then Friday the 4th gets even better: the swell drops a touch to 5ft, the wind goes light at 6 mph, and by Friday afternoon it goes glassy. The energy is still strong at 607. That Friday afternoon window is the absolute pearl of the whole forecast – clean, strong, and lined up. It’s a week and a half away, so keep an eye on it, but it’s got serious potential.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 25°C on Thu night). Winds increasing (calm on Thu afternoon, strong winds from the ENE by Sun morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Sun afternoon, min 24°C on Wed morning). Mainly strong winds. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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) | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | S 18 | S 19 |
Wave Graph  | ||||||||||||||||||||
 kJ | 200 | 274 | 291 | 261 | 322 | 261 | 255 | 382 | 301 | 307 | 177 | 219 | 189 | 187 | 336 | 276 | 183 | 215 | 307 | 340 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | cross | 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-off | cross-off | cross-off | cross-off |
High Tide | 10:11PM0.21m | 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 | |||||||
Low Tide | 8:27PM0.20m | 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 | ||||||||
 |  | | | | | | | | |  |  | | | | | | | | | |
 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — |
 | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 |
Feels °C | 31 | 29 | 30 | 30 | 29 | 27 | 23 | 23 | 23 | 23 | 22 | 23 | 24 | 23 | 24 | 23 | 23 | 22 | 22 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | ENE 7 | SW 17 | NE 7 | SSW 16 | SW 16 | SW 16 | SSW 16 | SW 15 | SSW 15 | E 8 | SSW 14 | SSW 13 | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 19 |
| kJ | 131 | 108 | 291 | 67 | 322 | 261 | 255 | 212 | 115 | 191 | 69 | 166 | 156 | 127 | 85 | 142 | 121 | 215 | 307 | 340 |
Swell 2 Height (m) Direction Period (s) | SSW 17 | SW 16 | NNE 7 | SW 16 | W 10 | W 10 | W 11 | S 14 | S 13 | NW 12 | SW 14 | SSE 12 | ESE 8 | E 8 | SSW 16 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 |
| kJ | 200 | 274 | 41 | 261 | 50 | 50 | 57 | 106 | 90 | 36 | 99 | 85 | 40 | 51 | 146 | 81 | 81 | 167 | 135 | 135 |
Swell 3 Height (m) Direction Period (s) | W 11 | W 9 | W 11 | W 10 | S 13 | S 12 | S 12 | WNW 10 | WNW 12 | SSE 13 | SSE 13 | NW 12 | SSE 12 | SSE 7 | SSE 12 | SSE 7 | SSW 18 | SSE 12 | SSE 12 | SSW 16 |
| kJ | 37 | 27 | 57 | 49 | 54 | 47 | 47 | 35 | 53 | 34 | 96 | 22 | 47 | 17 | 28 | 9 | 109 | 27 | 14 | 51 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 |
| kJ | — | — | — | — | 83 | 135 | 198 | 382 | 301 | 307 | 177 | 219 | 189 | 187 | 336 | 276 | 183 | 181 | 149 | 170 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 0 | 1 | 1 | 0 | 0 | 31 | 39 | 39 | 45 | 41 | 33 | 38 | 38 | 30 | 31 | 38 | 30 | 30 | 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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