Surf Forecasts:
Rockpiles surf forecast from 16 Aug 2026:
- Best quality surf: Thursday 20 Aug, 5AM (local time) - 1.5ft (0.5m), 17s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 2PM (local time) - 8ft (2.5m), 9s period, ENE swell with 1,131 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 5AM (local time) - 1.5ft (0.5m), 17s 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 Thursday (Aug 20) at 5AM. The primary swell is predicted to be 0.5m and 17s period with a secondary swell of 0.8m and 8s. 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 2.5m 9s and forecast to arrive on Sunday (Aug 16) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Saturday (Aug 22) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Thu 20th Aug) | 1.5ft (0.5m) 17s |
| Best Surf | 5AM (Thu 20th Aug) | 1.5ft (0.5m) 17s |
| Most Powerful | 2PM (Sun 16th Aug) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's put it in feet.
This week is pretty grim. The first few days are a total loss. A decent 10-foot ENE groundswell hits Rockpiles, but it's pushed by a strong 25 mph ESE cross-onshore wind and some heavy rain, making it a total mess. Wave energy is through the roof at 2741, but with that wind, it's not for paddling. Sunday afternoon is a little better, but still choppy.
Then we have a few days of tiny, clean waves to reset. The first real chance to get wet is Monday, August 17th. It's small, a clean 3-foot S swell. A fresh 19 mph ENE cross-offshore wind means the surface will be glassy. The period is a nice, long 14 seconds, so a proper groundswell with good energy (666). It's still marginal, but it's a clean paddle after the weekend's rubbish.
The standout window is looking like Thursday, August 27th and Friday, August 28th. That's over a week away, so treat it as promising, not a guarantee. It could be a classic for a spot like Rockpiles. For the 27th, we're talking a solid 10-foot ENE swell with a 10-second period and energy of 1971 to 2067. The wind is a fresh 22 mph from the ENE, which is cross-offshore and will groom the faces clean. That's big, over 8 feet, so experts only. Then Friday the 28th, it gets even chunkier – a solid 11-12 feet from the E, with energy hitting 2500. Same clean, cross-offshore wind. That's serious water.
After that big pulse, the last few days of the month back right off into small, clean waist-high S/SSW groundswells. Low energy, marginal surf. It's a real feast-or-famine stretch. Patience, brothers.
Rusty.
Short Range ForecastHeavy rain (total 41mm), heaviest during Sun morning. Warm (max 27°C on Sun night, min 24°C on Mon night). Winds decreasing (strong winds from the ESE on Sun morning, light winds from the E by Sun night). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | |||||||||||||||
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 9 | ENE 9 | ENE 8 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | SW 16 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1609 | 772 | 418 | 334 | 260 | 188 | 165 | 158 | 147 | 129 | 100 | 129 | 207 | 200 | 274 | 291 | 261 | 322 | 261 | 251 | 212 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | 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-on | cross-on | off | cross-on | cross-off | cross-off |
High Tide | 6:24PM0.45m | 7:54AM0.49m | 6:52PM0.37m | 8:59AM0.51m | 7:16PM0.30m | 10:13AM0.53m | 11:25AM0.56m | 10:11PM0.21m | 12:25PM0.59m | 00:08AM0.21m | 1:12PM0.63m | 1:06AM0.23m | |||||||||
Low Tide | 12:43PM0.20m | 00:58AM0.06m | 1:59PM0.25m | 1:27AM0.08m | 3:56PM0.27m | 2:01AM0.10m | 2:47AM0.12m | 8:27PM0.20m | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | ||||||||||
 |  |  |  | |  |  | | | | | | | |  | | | | | | | |
 | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — |
mm | 30 | 8 | 3 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 27 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 26 | 27 | 27 | 27 |
Feels °C | 24 | 25 | 28 | 25 | 23 | 24 | 24 | 24 | 24 | 25 | 26 | 26 | 27 | 27 | 28 | 29 | 30 | 29 | 30 | 30 | 28 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | ENE 9 | ENE 8 | S 14 | S 14 | S 13 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 8 | SW 16 | NE 7 | NE 7 | NE 7 | ENE 7 | SW 16 | E 8 |
| kJ | 885 | 772 | 418 | 334 | 260 | 170 | 165 | 119 | 116 | 108 | 84 | 82 | 74 | 54 | 274 | 62 | 59 | 69 | 83 | 251 | 130 |
Swell 2 Height (m) Direction Period (s) | S 13 | SSE 8 | SSE 7 | S 6 | SW 6 | SW 6 | SW 17 | SW 18 | SW 18 | SW 16 | SSW 16 | NE 6 | SSW 18 | SSW 17 | NE 7 | SW 17 | SW 16 | SSW 16 | SW 16 | E 6 | NE 7 |
| kJ | 115 | 350 | 66 | 32 | 12 | 5 | 74 | 80 | 79 | 129 | 100 | 38 | 207 | 200 | 45 | 291 | 261 | 322 | 261 | 28 | 77 |
Swell 3 Height (m) Direction Period (s) | S 16 | S 13 | S 14 | SW 18 | SSE 6 | WSW 6 | E 9 | SSE 8 | W 12 | S 12 | S 12 | SW 16 | NNE 7 | NNE 6 | E 7 | E 8 | SSE 8 | S 13 | S 12 | S 12 | SSW 16 |
| kJ | 132 | 123 | 250 | 50 | 6 | 4 | 15 | 13 | 26 | 44 | 45 | 129 | 35 | 27 | 27 | 21 | 14 | 54 | 47 | 76 | 212 |
Wind waves Height (m) Direction Period (s) | ENE 9 | SSE 8 | — | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | NNE 7 | NE 6 | — | — | — | — | — | — | — | — | ENE 7 | ESE 6 |
| kJ | 1609 | 604 | — | 250 | 231 | 188 | 149 | 158 | 147 | 31 | 32 | — | — | — | — | — | — | — | — | 83 | 70 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 233 | 45 | 0 | 30 | 30 | 1 | 30 | 3 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 20 | 20 | 0 | 1 | 1 | 0 |
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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