Rockpiles Surf Break

Lat Long: 21.28° N 157.84° W

Rockpiles Surf Forecast and Surf Report

Issued: 7 am 19 Aug 2026 (local time)

Forecast update in  hr  min

Today's Rockpiles sea temperature is
26.9° C
0.2° 

Rockpiles surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Rockpiles surf forecast from 20 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: Friday 21 Aug, 11PM (local time) - 2.5ft (0.8m), 16s period, SSW swell with 322 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 0.9m and 8s. Another secondary swell of 0.9m and 7s is also forecast. 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 0.8m 16s and forecast to arrive on Friday (Aug 21) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Monday (Aug 24) at 11AM.

Wave TypeTime (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 Powerful11PM (Fri 21st Aug)2.5ft (0.8m) 16s

Table - best surf conditions forecast for Rockpiles over the next 16 days.


The Lowdown

Alright, let’s get into it. The next couple of weeks at Rockpiles are a bit of a mixed bag. The water is sitting at 80°, which is pretty much normal for this time of year, so no surprises there.

Right now, we’re looking at small, clean surf through Wednesday morning, with a 2ft SSW groundswell rolling in at a long 16 seconds. The wind is cross-off from the ENE, so it’s tidy enough. The wave energy is pretty weak though, sitting at 288 – not a lot of push. Wednesday afternoon drops off even more, so don’t expect much.

Thursday 20th August is worth a paddle. The morning brings a clean 2ft swell from the SSW with a very long 18-second period, and the wind is light and cross-off. The energy is still low at 278, but it’s glassy and lined up. Thursday afternoon stays clean with a 2ft SSW swell and a slight air from the NNE – that’s a nice window for a few waves.

Friday 21st has a 2ft SW swell, but the morning is cross-on from the SE with light wind, so it’s a bit bumpy. The afternoon settles back to cross-off and clean, with the same size swell. Not a standout, but workable.

Then we hit a rough patch. From Saturday 22nd right through to the end of August, the wind cranks up from the ENE – strong to fresh breezes, mostly 19 to 28 mph. The swell jumps around but stays mostly small or short-period, with energy climbing into the 400s and 500s – moderate, but the wind kills it. Sunday 23rd sees a 6ft ENE windswell with a 7-second period – that’s short, choppy, and messy. Not worth the drive.

We do get a bit of a bump in size around the 29th to 31st of August, with 7ft to 7ft ENE windswells, but the period is still short (6 to 8 seconds) and the wind is relentless. This is more of a kite-surfing setup than a clean paddle session.

Now, looking into the first week of September, things start to get interesting. On the 1st of September, we see a 7ft ENE swell building with a longer period – 10 to 11 seconds – and the energy jumps to 1045 and 1194, which is strong. The wind is still fresh from the ENE, but cross-off, so it’s clean. This is for experts only though – anything over 8ft is real heavy, and 7ft is getting up there, especially with that long period. The break is a reef, so it’ll hold, but you need to know what you’re doing.

The best of the whole run looks like the 2nd and 3rd of September. On the 2nd, we’ve got a 7ft east swell with an 11-second period, and the energy is massive at 1534 – very strong. The wind is moderate from the ENE, clean and cross-off. That’s the standout. The 3rd of September drops a little to 6ft from the ENE, still with a 10-second period and strong energy at 1099, but the wind swaps to cross-shore from the east, so there’s a bit of chop. Still, it’s a solid window for the experienced crew.

Overall, the first week is pretty quiet. From Thursday 20th August things perk up, then there’s a long gap of poor conditions from the 22nd to the 31st. The real action is at the start of September – the 1st, 2nd, and 3rd – with the 2nd being the pick of the bunch. Keep an eye on it, but remember it’s a long-range call, so don’t book the week off just yet.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Wed morning). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 2mm), mostly falling on Mon night. Warm (max 27°C on Sat afternoon, min 25°C on Sat night). Mainly strong winds.

Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Tuesday
25
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
1
2
2
2
1
2
2
0
0
0
0
0
0
0
0
0
1
1
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
SW
16
0.8
E
8
1.2
ENE
7
0.6
SSW
18
0.6
SSW
17
0.7
SW
16
0.7
SW
17
0.7
SW
16
0.8
SSW
16
0.7
SW
16
0.7
SW
16
1.6
ENE
7
1.7
ENE
7
0.7
SSW
15
1.5
ENE
6
0.7
SSW
14
1.6
ENE
6
1.4
ENE
6
1.5
E
8
1.6
ENE
8
1.5
ENE
7
Wave Graph
Metric surfscale
Energy kJ
129
100
153
207
200
274
291
264
322
261
255
261
247
220
172
166
182
153
294
314
210
Wind (km/h)
20
ENE
25
ENE
15
NE
10
ENE
5
NNE
5
NE
5
SE
10
ENE
15
ENE
35
ENE
40
ENE
45
ENE
45
ENE
40
ENE
40
ENE
40
ENE
25
ENE
25
ENE
30
ENE
25
ENE
30
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
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-off
High Tide
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
2:26PM0.67m
2:21AM0.29m
2:56PM0.68m
2:55AM0.33m
Low Tide
2:47AM0.12m
8:27PM0.20m
8:41PM0.17m
5:06AM0.12m
9:00PM0.16m
6:08AM0.10m
9:18PM0.14m
6:59AM0.08m
9:35PM0.13m
7:43AM0.06m
9:53PM0.11m
part cloud
part cloud
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
part cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:11
6:11
6:11
6:11
6:11
6:11
6:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:58
6:57
6:57
6:55
6:54
6:53
6:52
 mm
2
1
1
Temp °C
25
26
25
26
27
27
26
27
27
26
27
25
26
26
25
26
27
26
26
26
25
Feels °C
25
26
25
28
30
31
30
30
30
25
25
23
22
22
22
24
26
26
26
24
23
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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