Surf Forecasts:
Rockpiles surf forecast from 16 Aug 2026:
- Best quality surf: Monday 17 Aug, 2AM (local time) - 6ft (1.8m), 8s period, ENE swell with cross-offshore winds.
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 15ft (4.5m), 10s period, E swell with 3,618 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 2AM (local time) - 6ft (1.8m), 8s period with ENE 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 Monday (Aug 17) at 2AM. The primary swell is predicted to be 1.8m and 8s 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 4.5m 10s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-shore 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 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Mon 17th Aug) | 6ft (1.8m) 8s |
| Best Surf | 2AM (Mon 17th Aug) | 6ft (1.8m) 8s |
| Most Powerful | 8AM (Sun 16th Aug) | 15ft (4.5m) 10s |
Table - best surf conditions forecast for Rockpiles over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at the next couple of weeks for Rockpiles.
To be honest, the next week and a half is a bit of a struggle. We've got a solid first half of the forecast period that’s mostly a write-off thanks to some strong, messy winds and a lot of junk swell. Things start to look a whole lot more interesting towards the very end, though, so don't give up just yet.
Right off the bat, the next few days are a no-go. Sunday the 16th is a total mess with a risk of thunderstorms, strong cross-onshore winds, and wave energy up there, but it's all ugly. The swell is a jumbled 10 ft from the ENE with a short, weak period. It's a hard pass. Monday the 17th finally cleans up with cross-offshore winds, but the surf is tiny and weak, just 3 ft. The water is sitting at a warm 81°, which is pretty much average for this time of year. Nothing to get excited about.
We basically go through a long dry spell from the 18th all the way through the 23rd of August. The swell drops right off, and while the winds are generally clean from the ENE, there just isn't any size or power. You'll see a few tiny pulses of long-period SSW groundswell on the 20th, but at 2 ft it's barely a ripple. It's a grim run for a solid week.
Now, hang in there, because things start to change around the 27th of August. The swell starts to build, but it's still only in the "marginal" range. By the 29th of August, we start seeing some serious size. The Saturday the 29th has a solid 10 ft of ENE swell rolling in, with combined energy climbing into the strong range. The winds are a clean cross-off from the ENE at 19 mph, so the surface should be clean. This is big, punchy beach-break style stuff. At 10 ft with an 8-second period, it's going to be a heavy, powerful beast – definitely one for the experienced crew only. Beginners, stay on the sand.
The best of the lot, the true standout, looks like Monday the 31st of August. The swell drops a bit to a more manageable 4 ft, but the period stretches right out to 13 seconds – proper groundswell energy. The wave energy is still impressive, and the winds are offshore light. This is a sweet spot. That long-period groundswell from the east will offer up some proper lines and shape across the reef. Just remember, long period swells can sometimes break a bit straight on a beach, but on a reef setup like Rockpiles, this is the one to circle on the calendar. Keep an eye on this one.
Take it easy, catch you in the water.
Rusty.
Short Range ForecastHeavy rain (total 47mm), heaviest during Sun morning. Warm (max 26°C on Sun morning, min 25°C on Sun morning). 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 26°C on Wed 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 | ENE 8 | S 14 | ENE 7 | S 13 | ENE 7 | ENE 9 | E 8 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 |
Wave Graph | |||||||||||||||||||||
1424 | 754 | 394 | 276 | 260 | 170 | 165 | 137 | 193 | 169 | 100 | 129 | 207 | 200 | 274 | 291 | 264 | 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-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 | cross | cross-off | cross-off | 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 | 34 | 7 | 6 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 25 | 25 | 27 | 25 | 25 | 24 | 24 | 24 | 25 | 24 | 26 | 26 | 27 | 27 | 27 | 29 | 29 | 28 | 27 | 27 | 25 |
Swell 1 Height (m) Direction Period (s) | SSE 9 | ENE 9 | ENE 8 | S 14 | S 14 | ENE 7 | ENE 7 | S 13 | S 13 | SW 16 | E 8 | E 8 | E 8 | E 8 | NE 7 | ENE 7 | NE 7 | SSW 16 | ENE 6 | E 8 | SSW 16 |
592 | 754 | 394 | 264 | 260 | 163 | 132 | 119 | 80 | 129 | 84 | 63 | 57 | 54 | 55 | 84 | 57 | 322 | 66 | 61 | 212 | |
Swell 2 Height (m) Direction Period (s) | S 16 | SSE 8 | SSE 7 | SSE 6 | SW 6 | S 13 | S 13 | SW 18 | SSE 7 | S 12 | S 12 | NE 6 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | NE 7 | SW 16 | SW 16 | SSE 12 |
190 | 229 | 68 | 21 | 18 | 170 | 165 | 80 | 9 | 44 | 45 | 40 | 207 | 200 | 274 | 291 | 264 | 55 | 261 | 251 | 50 | |
Swell 3 Height (m) Direction Period (s) | S 13 | S 13 | S 14 | SW 6 | SSE 6 | SW 6 | SW 17 | WSW 7 | SW 18 | NNE 6 | SSW 16 | SW 16 | NE 6 | NNE 6 | E 8 | S 11 | E 8 | S 13 | S 12 | S 12 | WNW 10 |
81 | 166 | 250 | 18 | 10 | 5 | 74 | 10 | 79 | 8 | 100 | 129 | 32 | 27 | 28 | 21 | 12 | 54 | 47 | 76 | 33 | |
Wind waves Height (m) Direction Period (s) | ENE 9 | SSE 8 | — | ENE 8 | ENE 7 | — | — | ENE 7 | ENE 9 | E 8 | NNE 6 | — | — | — | — | — | — | — | — | NE 7 | E 7 |
1424 | 356 | — | 276 | 231 | — | — | 137 | 193 | 169 | 27 | — | — | — | — | — | — | — | — | 44 | 212 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 156 | 45 | 0 | 30 | 30 | 2 | 30 | 1 | 1 | 30 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 30 | 30 | 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.











