Rockpiles Surf Break

Lat Long: 21.28° N 157.84° W

Rockpiles Surf Forecast and Surf Report

Issued: 7 pm 18 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 19 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: Monday 24 Aug, 8AM (local time) - 7.5ft (2.3m), 7s period, E swell with 585 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 0.8m 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 2.3m 7s and forecast to arrive on Monday (Aug 24) at 8AM. 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 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 Powerful 8AM (Mon 24th Aug)7.5ft (2.3m) 7s

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 on the table for the next couple of weeks.

First off, we’ve got a bit of a slow start. The early part of the outlook is pretty quiet, with only small, clean swell at Rockpiles. The water temp is running about average for this time of year, so no surprises there.

The real standout window is shaping up around Thursday, 20 August. That morning, Rockpiles is seeing a 2ft SSW groundswell, with a period of 18 seconds—that’s a long-period, deep-ocean pulse. The wind is light and variable from the NE at 6 mph, keeping it clean. The combined energy is moderate at 262, and the offshore direction is N, which is a good match for this reef. It’s a fairly consistent spot, but you can expect crowds sometimes. For a reef break, that long period will give you real shape and power, with nice gaps between sets. Thursday afternoon is even better: the wind goes offshore at 3 mph, glassy conditions, with the same 2ft SSW swell. That’s the pick of the whole period—clean, lined-up, and easy to paddle out.

After that, we get into a rough stretch. From Saturday, 22 August, the wind cranks up and stays strong, with conditions turning poor. The swell picks up a bit, but it’s short-period windswell and the wind is ripping. By Sunday, 23 August, the swell hits 6ft ENE, but it’s a messy, short 7-second period, and the wind is a strong breeze. That’s only for experts, and even then, the quality is poor. This windy, messy pattern sticks around for well over a week, with very little surf worth chasing.

Then, look out for Tuesday, 1 September. That’s when we see a major shift. The swell is 7ft ENE, period jumps to 11 seconds, and the combined energy is a massive 1506—strong. The wind is still cross-off, but the swell is building. By Wednesday, 2 September, it’s 10ft E at 13 seconds, with energy over 3000. That’s a very long-period groundswell, and at 10ft it’s solidly in the expert-only zone. The reef at Rockpiles will handle it, but the strong breeze is a concern. It’s promising, but it’s a long way out—keep an eye on it.

So, to wrap it up: the best surf is Thursday, 20 August at Rockpiles, with small, clean, long-period SSW swell and offshore winds. After that, there’s a long gap of poor conditions until the last few days of the window, which show a big, powerful groundswell that’s worth watching.

Stay frothy.

Rusty

Short Range Forecast

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

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Mon afternoon. Warm (max 27°C on Sat afternoon, min 25°C on Fri night). Winds increasing (light winds from the NE on Fri night, near gales from the ENE by Mon morning).

Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
1
1
2
2
2
1
1
1
0
1
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.2
ENE
8
0.5
SW
16
0.8
E
8
0.5
SW
16
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
2.1
E
7
1.9
ENE
7
2
ENE
7
2.2
ENE
7
2.1
E
7
2
E
8
2.1
E
8
Wave Graph
Metric surfscale
Energy kJ
159
129
100
129
207
200
274
291
261
322
261
255
457
332
340
448
465
488
573
Wind (km/h)
20
ENE
20
ENE
25
ENE
15
NE
10
NE
5
NNE
5
NE
10
ESE
15
E
15
ENE
35
ENE
35
ENE
35
ENE
40
ENE
40
NE
45
NE
50
ENE
25
E
35
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
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
Low Tide
2:01AM0.10m
2:47AM0.12m
8:27PM0.20m
8:41PM0.17m
5:06AM0.12m
9:00PM0.16m
6:08AM0.10m
9:18PM0.14m
6:59AM0.08m
9:35PM0.13m
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
thunderstorm
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
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:59
6:58
6:57
6:57
6:55
6:54
6:53
 mm
5
12
Temp °C
25
25
26
25
26
27
26
26
27
26
26
27
25
26
26
25
26
26
25
Feels °C
24
25
26
25
28
30
30
29
30
29
26
24
23
23
23
22
22
22
25
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  • 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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