
Surf Forecasts:
Rockpiles surf forecast from 4 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 5PM (local time) - 13ft (4.0m), 14s period, SW swell with 6,058 kJ wave energy.
- Next surfable swell (1★+): Wednesday 9 Sep, 5AM (local time) - 3ft (0.9m), 14s 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 Wednesday (Sep 09) at 5AM. The primary swell is predicted to be 0.9m and 14s period. 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 4.0m 14s and forecast to arrive on Monday (Sep 07) at 5PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 9s period and expected on Wednesday (Sep 09) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Best Surf | 5AM (Wed 9th Sep) | 3ft (0.9m) 14s |
| Most Powerful | 5PM (Mon 7th Sep) | 13ft (4.0m) 14s |
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 coming up for Rockpiles.
Right off the bat, the first couple of days have some waves, but they’re not really singing. The wind is a steady cross-off from the ENE, which keeps the surface clean, but the swell is a bit mixed up and the conditions are rated as marginal. The water temperature is 81°, which is pretty much spot on for this time of year, so no surprises there.
The real standout in this whole forecast lands on Monday, September 7th. That morning, we’ve got a solid 10ft swell from the SW, with a long period of 15 seconds – that’s proper groundswell energy. The combined energy is pumping hard at 6398, which is serious. This is a reef break, and that long-period SW groundswell is going to line up beautifully. The wind is a moderate cross-shore from the ESE, which is workable. This is definitely the best session on offer, but that swell is big, over 8ft, so this is for experienced surfers only. The morning is the window; the afternoon turns into a fresh cross-onshore, making it unsurfable.
After that, the swell drops back down. The rest of the first week and into the second week is a long run of consistent but not exciting surf. The swell hangs around in the 5ft to 8ft range from the ENE, with short periods around 7 to 9 seconds. The wind stays cross-off and clean, but these are short-period, wind-driven waves. The energy numbers are moderate, mostly in the 700 to 1400 range. It’s surfable, but nothing to get too worked up about.
Then we get a nice little pulse for the middle of the second week. On Wednesday, September 16th, the conditions turn excellent. The swell is a clean 7ft from the ENE with a period of 9 seconds, and the wind drops to a light breeze, making for glassy conditions. The combined energy is 1360, which is solid. This is a great window for experienced surfers, with clean, user-friendly waves. The morning and afternoon both look good.
The very end of the forecast, from Thursday, September 17th into the weekend, sees a shift. The swell drops right down to about 3ft, but it switches to a long-period SSW groundswell, with periods of 16 to 17 seconds and combined energy around 1000. The wind stays light and cross-off. This is a completely different wave – long, clean lines – but it’s small. It’ll be a good option for a longboard or a fun mid-length, but it’s not going to be a big-wave day.
So, to sum it up: The absolute best bet is the morning of Monday, September 7th, with big, powerful SW groundswell. The second best is the clean, solid conditions on Wednesday, September 16th. There’s a long stretch of smaller, short-period surf in between, but it’s still surfable with the clean cross-off wind.
Stay salty.
Rusty.
Short Range ForecastModerate rain (total 16mm), heaviest on Sun night. Warm (max 27°C on Sat afternoon, min 25°C on Fri night). Winds decreasing (strong winds from the ENE on Fri morning, light winds from the ENE by Sun night). | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Mon night. Warm (max 28°C on Mon afternoon, min 25°C on Wed night). Winds decreasing (fresh winds from the S on Mon night, light winds from the E by Tue night). | ||||||||||||||||||||
Friday 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | |||||||||||||||
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) | S 12 | E 14 | E 14 | ENE 13 | ENE 13 | E 13 | ENE 12 | SSW 14 | SSW 14 | SW 15 | SW 14 | ENE 12 | ENE 11 | ENE 10 | SSW 14 | SSW 14 | E 13 | ENE 7 | ENE 7 | ENE 7 | ENE 8 |
Wave Graph | |||||||||||||||||||||
521 | 577 | 1977 | 1792 | 1616 | 1538 | 1240 | 1382 | 1960 | 4187 | 6058 | 1121 | 773 | 462 | 356 | 273 | 222 | 279 | 247 | 229 | 296 | |
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 | cross-on | on | on | on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 10:58AM0.66m | 10:35PM0.19m | 12:05PM0.69m | 00:18AM0.21m | 1:00PM0.73m | 1:21AM0.26m | 1:47PM0.73m | 2:09AM0.32m | 2:28PM0.72m | 2:51AM0.39m | 3:05PM0.69m | 3:32AM0.45m | 3:39PM0.64m | 4:11AM0.50m | |||||||
Low Tide | 7:30PM0.17m | 3:46AM0.09m | 8:03PM0.13m | 5:11AM0.08m | 8:31PM0.10m | 6:25AM0.07m | 8:57PM0.08m | 7:26AM0.06m | 9:22PM0.06m | 8:21AM0.06m | 9:46PM0.05m | 9:12AM0.07m | 10:10PM0.04m | ||||||||
6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | |
— | 6:44 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | |
mm | — | — | — | — | — | — | — | 6 | 10 | 2 | — | 4 | 2 | 2 | 1 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 26 | 26 | 27 | 28 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 23 | 22 | 22 | 24 | 25 | 26 | 25 | 26 | 25 | 27 | 27 | 27 | 28 | 29 | 31 | 27 | 26 | 26 | 23 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | S 12 | E 14 | S 13 | S 12 | SSW 12 | SSW 12 | SSW 13 | ENE 12 | SSW 14 | SW 15 | SW 14 | WSW 11 | ENE 11 | ENE 10 | ENE 9 | SSW 14 | E 13 | E 13 | E 12 | E 13 | ENE 13 |
521 | 577 | 643 | 565 | 794 | 718 | 980 | 1338 | 1960 | 4187 | 6058 | 1027 | 773 | 462 | 216 | 273 | 222 | 212 | 196 | 229 | 282 | |
Swell 2 Height (m) Direction Period (s) | E 14 | S 11 | N 11 | SSW 17 | NNE 10 | NNE 9 | SW 16 | SSW 14 | S 18 | ENE 13 | ENE 13 | ENE 12 | SSW 9 | SSW 8 | SSW 14 | E 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 16 |
357 | 244 | 10 | 112 | 19 | 15 | 129 | 1382 | 240 | 1844 | 1697 | 1121 | 371 | 232 | 356 | 232 | 204 | 133 | 131 | 89 | 175 | |
Swell 3 Height (m) Direction Period (s) | SW 12 | S 13 | SSW 20 | NNE 10 | S 22 | SSE 10 | SSW 20 | SSE 10 | N 9 | SSW 17 | SSW 16 | SSW 15 | W 10 | SSW 14 | SSW 8 | SSW 8 | SSW 7 | SSW 7 | SW 16 | SW 18 | SSW 12 |
6 | 280 | 38 | 20 | 9 | 19 | 76 | 19 | 7 | 367 | 694 | 505 | 320 | 371 | 83 | 44 | 30 | 16 | 133 | 155 | 47 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | E 14 | ENE 13 | ENE 13 | E 13 | ENE 12 | — | ENE 12 | — | — | S 10 | — | — | — | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 8 |
443 | 366 | 1977 | 1792 | 1616 | 1538 | 1240 | — | 1643 | — | — | 783 | — | — | — | 192 | 142 | 279 | 247 | 218 | 296 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 44 | 39 | 30 | 30 | 30 | 30 | 32 | 2 | 3 | 45 | 124 | 48 | 20 | 16 | 1 | 1 | 2 | 30 | 31 | 33 | 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.










