Surf Forecasts:
Rockpiles surf forecast from 31 Aug 2026:
- Most powerful swell: Saturday 5 Sep, 11AM (local time) - 8ft (2.5m), 14s period, ENE swell with 2,285 kJ wave energy.
Best Forecast Surf Conditions for Rockpiles this week:
The most powerful waves expected at Rockpiles in the next 16 days are 2.5m 14s and forecast to arrive on Saturday (Sep 05) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Sat 5th Sep) | 8ft (2.5m) 14s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk Rockpiles. It’s a reef break, breaks fairly consistently, and the water temp is about 81°, which is normal for the season.
First week is a real struggle. From August 31st through the first few days of September, we’ve got swell running 6 to 7 feet, but it’s all short-period stuff – 7 to 8 seconds – and the wind is a steady cross-off from the ENE at 22 to 25 mph. The wave energy is moderate (640 to 930), but the swell direction is all wrong for this spot. Rockpiles really wants it from the SSE. The surface is clean, but the waves are just junk. Not worth paddling out.
That continues through the 2nd, 3rd, and 4th of September. The swell gets bigger, up to 10 feet on the 4th, but the period stays short (8 seconds) and the wind is still strong. The energy gets into the strong range (1640 on the 4th morning), but it’s marked as poor conditions. That’s a lot of water moving with no real form.
Then it gets interesting. On the 5th of September, a proper groundswell arrives. The period jumps to 14 seconds, and the swell is still a solid 8 feet. The combined energy is very strong (2730). Wind is still cross-off from the ENE, but it drops to 16 mph in the afternoon. This is the best window. The swell direction isn’t ideal, but that long period will wrap into the reef. The 5th and 6th of September are the standouts for experienced surfers. The 7th of September is also good, especially Monday afternoon when the wind goes offshore from the NNE, with 7 feet of 11-second swell and strong energy (1938). That’s clean and lined up.
After that, it’s all over. The 8th of September brings a southerly wind, onshore, with a small pulse of SSW swell. From the 9th through the 15th, the swell drops to 2 feet or less, the energy is weak (under 300), and even though the wind stays cross-off, there’s just nothing to ride.
So, the real window is the 5th through the 7th of September. Saturday the 5th and Sunday the 6th are the picks – big, long-period ENE swell, clean conditions. Monday the 7th afternoon is a bonus with offshore wind. If you’re advanced, that’s your time. For everyone else, it’s a waiting game.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Mon morning). Mainly strong winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 27°C on Sat morning, min 25°C on Thu morning). Mainly strong winds. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 14 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | ENE 12 |
Wave Graph  | |||||||||||||||||||||
 kJ | 405 | 428 | 439 | 475 | 487 | 475 | 439 | 414 | 768 | 828 | 744 | 1145 | 1128 | 727 | 515 | 2285 | 1893 | 2123 | 1808 | 1703 | 1824 |
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 | 5:48PM0.44m | 7:14AM0.56m | 6:20PM0.36m | 8:21AM0.59m | 6:54PM0.28m | 9:39AM0.62m | 7:57PM0.22m | 10:58AM0.66m | 10:35PM0.19m | 12:05PM0.69m | 00:18AM0.21m | 1:00PM0.73m | 1:21AM0.26m | ||||||||
Low Tide | 12:22PM0.19m | 00:10AM0.05m | 1:40PM0.23m | 00:43AM0.05m | 3:38PM0.25m | 1:25AM0.06m | 6:22PM0.22m | 2:24AM0.08m | 7:30PM0.17m | 3:46AM0.09m | 8:03PM0.13m | 5:11AM0.08m | 8:31PM0.10m | ||||||||
 | |  | | | | | | | |  |  | | | | | |  | | | | |
 | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — |
 | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:44 | — | — | 6:43 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 23 | 23 | 24 | 24 | 25 | 24 | 24 | 23 | 24 | 22 | 21 | 21 | 21 | 21 | 24 | 25 | 25 | 25 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | SSW 14 | S 19 | SSW 18 | S 18 | S 17 | S 16 | S 16 | S 15 | S 14 | SSE 13 | SSE 12 | SSE 12 | S 11 | S 11 | S 10 | S 10 | SSW 10 | ENE 13 | SSW 10 | ENE 12 |
| kJ | 144 | 138 | 192 | 333 | 314 | 364 | 422 | 318 | 279 | 206 | 206 | 333 | 494 | 358 | 491 | 367 | 314 | 206 | 1808 | 138 | 1824 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | SSW 14 | S 12 | S 10 | SSE 10 | S 11 | E 13 | SE 13 | S 14 | SSW 14 | SW 12 | E 14 | E 14 | SW 18 | SSW 18 | SSW 16 | SSW 11 | SSW 16 | SSW 18 |
| kJ | 57 | 55 | 50 | 80 | 77 | 35 | 19 | 41 | 123 | 88 | 198 | 61 | 6 | 357 | 515 | 78 | 120 | 102 | 222 | 229 | 340 |
Swell 3 Height (m) Direction Period (s) | S 21 | SSW 19 | SW 14 | S 10 | SW 14 | SW 14 | SW 14 | E 14 | S 11 | S 10 | E 12 | SW 18 | SW 18 | SW 13 | SSW 20 | NNE 10 | NNE 10 | S 12 | SSW 16 | SSE 12 | SW 10 |
| kJ | 34 | 122 | 54 | 30 | 52 | 51 | 30 | 66 | 38 | 18 | 107 | 12 | 12 | 27 | 38 | 10 | 19 | 46 | 171 | 45 | 102 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 14 | ENE 13 | ENE 13 | ENE 13 | ENE 12 | — |
| kJ | 405 | 428 | 439 | 475 | 487 | 475 | 439 | 414 | 768 | 828 | 744 | 1145 | 1128 | 727 | 512 | 2285 | 1893 | 2123 | 1060 | 1703 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 45 | 38 | 30 | 31 | 127 | 30 | 39 | 44 | 39 | 127 | 127 | 127 | 47 | 47 | 39 | 31 | 31 | 30 | 38 | 38 | 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.
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