Surf Forecasts:
Rockpiles surf forecast from 18 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 2PM (local time) - 1.5ft (0.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Monday 24 Aug, 5PM (local time) - 8ft (2.5m), 8s period, ENE swell with 768 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 2PM (local time) - 1.5ft (0.5m), 16s 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 Wednesday (Aug 19) at 2PM. The primary swell is predicted to be 0.5m and 16s 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 8s and forecast to arrive on Monday (Aug 24) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 7s period and expected on Friday (Aug 21) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2PM (Wed 19th Aug) | 1.5ft (0.5m) 16s |
| Best Surf | 2PM (Wed 19th Aug) | 1.5ft (0.5m) 16s |
| Most Powerful | 5PM (Mon 24th Aug) | 8ft (2.5m) 8s |
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 Rockpiles has in store for us over the next couple of weeks.
Alright, straight up, the forecast for Rockpiles is a bit of a slow burn. We're looking at a long stretch of mediocre conditions, and honestly, it's not until the end of the run that we might see something half-decent. The good news is Rockpiles is a fairly consistent reef break that’s exposed to the swell, so when it's on, it's on. Right now though, we're in a waiting game.
Tuesday the 18th kicks things off with a small 2 ft S swell and a 13-second period, which isn't bad for shape, but that 19 mph cross-offshore wind from the ENE is making things look pretty average. The energy is sitting at a moderate 396, but the surf quality is just poor. That tiny 4 ft (ENE) on Tuesday arvo with a short 7-second period is a no-go for paddling; honestly, it's more of a kiteboarding situation with those winds.
We drift through Wednesday and Thursday the 20th. Thursday morning shows a tiny glimmer of hope – a 2 ft SSW groundswell with a long 18-second period, and the wind backs off to a gentle 9 mph breeze from the E. It's still cross-off, but the wave energy is moderate (281) and the surf quality is labeled as "good." This would be the pick of the first few days, but it’s tiny – really only for a longboard or a funboard. The water temp is about average for this time of year.
From Friday the 21st onward, it's a long, grim stretch. The wind cranks up to a fresh to strong breeze from the ENE, blowing 19 to 28 mph. The swell direction locks in from the ENE, with a short 7-second period. This makes for lumpy, choppy, and basically unsurfable conditions for a solid week. The combined energy climbs from 461 into the 800-1000 range (strong), but it’s all windswell with terrible shape. For a reef break like Rockpiles, a short-period swell is never going to produce the goods.
We finally start to see a shift around the 30th of August. The wind eases a touch to 22 mph from the ENE, and the period stretches out to 10 seconds. The swell drops to 5 ft to 5 ft. It’s still poor overall, but that increase in period is a positive sign.
The standout window for the whole forecast is looking like Monday the 31st of August morning. There's a pulse of 5 ft ENE swell with a 10-second period, and the cross-off wind is a more manageable 19 mph. The combined energy is a solid 591 (moderate to strong). Sure, it's not perfect, but after a week of junk, it's the best on offer. It’s still expert-only territory though, with that size and period, and the ENE direction isn’t ideal for Rockpiles (it prefers SSE). Crowds are *sometimes* there, so you might have some company, but given the long flat spell, it might be quiet.
So, to wrap it up: Don't bother until that last week of August. Thursday the 20th is your best *small* chance early on, but the real call is Monday the 31st of August morning – that's the standout, but be prepared for a fight with the wind.
Stay patient, gang.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Fri afternoon, min 24°C on Thu night). Winds increasing (light winds from the NNE on Thu night, strong winds from the ENE by Sun morning). | ||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
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 13 | ENE 7 | ENE 7 | ENE 8 | SW 16 | E 8 | SW 16 | SSW 18 | SSW 17 | SW 16 | SW 17 | SW 16 | SSW 16 | SW 16 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||
170 | 165 | 143 | 151 | 129 | 100 | 129 | 207 | 200 | 274 | 291 | 261 | 322 | 261 | 255 | 496 | 350 | 342 | 352 | |
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 | off | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 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 | 1:52PM0.66m | 1:46AM0.26m | ||||||||
Low Tide | 1:27AM0.08m | 3:56PM0.27m | 2:01AM0.10m | 2:47AM0.12m | 8:27PM0.20m | 8:41PM0.17m | 5:06AM0.12m | 9:00PM0.16m | 6:08AM0.10m | 9:18PM0.14m | |||||||||
— | 6:09 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | |
7:00 | — | 6:59 | — | — | 6:58 | — | — | 6:57 | — | — | 6:57 | — | — | 6:55 | — | — | 6:54 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 25 | 24 | 25 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 24 | 23 | 22 | 23 | 25 | 27 | 25 | 27 | 28 | 29 | 29 | 30 | 29 | 27 | 23 | 23 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | S 13 | S 13 | S 13 | E 8 | E 8 | E 8 | E 8 | E 7 | NE 7 | E 7 | SW 16 | SSW 16 | SW 16 | SW 16 | SSW 16 | SW 15 | SSW 15 | SW 14 |
139 | 165 | 119 | 116 | 109 | 84 | 82 | 74 | 70 | 79 | 51 | 261 | 322 | 261 | 255 | 212 | 116 | 144 | 99 | |
Swell 2 Height (m) Direction Period (s) | S 13 | SW 17 | SW 18 | SW 18 | NNE 7 | S 12 | SW 16 | NE 6 | SSW 17 | SW 16 | SW 17 | E 7 | WNW 10 | WNW 10 | W 10 | S 14 | S 13 | SSE 13 | SSE 13 |
170 | 74 | 80 | 79 | 30 | 45 | 129 | 32 | 200 | 274 | 291 | 49 | 33 | 33 | 53 | 104 | 90 | 35 | 57 | |
Swell 3 Height (m) Direction Period (s) | E 9 | WSW 6 | W 13 | W 12 | SW 16 | SSW 16 | S 12 | SSW 18 | NNE 6 | E 8 | NNE 7 | NE 7 | S 13 | S 12 | S 12 | WNW 12 | SSW 15 | S 11 | ESE 10 |
25 | 3 | 31 | 25 | 129 | 100 | 45 | 207 | 28 | 28 | 30 | 36 | 54 | 47 | 47 | 53 | 76 | 22 | 34 | |
Wind waves Height (m) Direction Period (s) | — | ENE 7 | ENE 7 | ENE 8 | — | NE 6 | NE 6 | — | — | — | — | — | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 |
— | 154 | 143 | 151 | — | 32 | 30 | — | — | — | — | — | 85 | 153 | 247 | 496 | 350 | 342 | 352 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 30 | 30 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 20 | 1 | 1 | 30 | 38 | 38 | 41 | 127 | 38 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











