Rockpiles Surf Break

Lat Long: 21.28° N 157.84° W

Rockpiles Surf Forecast and Surf Report

Issued: 7 am 18 Aug 2026 (local time)

Forecast update in  hr  min

Today's Rockpiles sea temperature is
27.0° 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, 2AM (local time) - 1.5ft (0.5m), 16s period, SW swell with cross-offshore winds.
  • Most powerful swell: Tuesday 25 Aug, 2AM (local time) - 8ft (2.4m), 8s period, ENE swell with 678 kJ wave energy.
  • Next surfable swell (1★+): Thursday 20 Aug, 2AM (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 Thursday (Aug 20) at 2AM. The primary swell is predicted to be 0.5m and 16s period with a secondary swell of 0.9m 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 2.4m 8s and forecast to arrive on Tuesday (Aug 25) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 7s period and expected on Thursday (Aug 20) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+) 2AM (Thu 20th Aug)1.5ft (0.5m) 16s
Best Surf 2AM (Thu 20th Aug)1.5ft (0.5m) 16s
Most Powerful 2AM (Tue 25th Aug)8ft (2.4m) 8s

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


The Lowdown

Alright, Rusty here again. Let’s break down the surf for Rockpiles in feet and knots.

Water temp is a comfortable 81°, which is perfectly normal for this time of year – no need for rubber.

Now, the first week is a bit of a slow burn. From Tuesday 18 August through Friday 21 August, we’ve got clean, small waves running 2ft. The combined energy is weak to moderate (417 to 358), and while the wind is cross-off or even glassy on Friday afternoon, the swell is too small to get real excited about. The south-west groundswell has a long period of 16–18 seconds, so it’ll be smooth and lined up, but you’ll be scratching for every ride. It’s longboard territory at best.

Then from Saturday 22 August to Monday 25 August, the wind kicks up hard from the ENE at 22–25 mph. That’s a fresh to strong breeze, and the swell jumps to 8ft, but it’s short-period windswell (7–8 seconds). The energy is strong (860 to 899), but the surf quality is poor – bumpy, lumpy, and more suited to a kite than a paddle board. The waves are too big for beginners and only for experienced guys if you’re keen.

Wednesday 26 August through Friday 28 August stays windy with ENE winds at 19–22 mph, holding the swell at 6ft to 6ft. The period is still short (6–7 seconds), and the energy is strong (640 to 882). Still marginal, still messy.

Here’s the real standout: Saturday 29 August afternoon. The wind drops to a gentle 9 mph from the ENE, the swell pushes to 8ft from the east-northeast, and the combined energy hits 962 – that’s strong, solid power. The period is still short at 8 seconds, but the conditions are clean and the forecast says “expect very good surf conditions.” This is the best session of the whole run. The swell is 8ft, so it’s experts only – heavy, powerful, and charging.

Sunday 30 August ramps up even more. Morning swell is 8ft from the east, and by the afternoon it’s 10ft from the east-northeast, with energy of 1749 and 1886 – that’s extreme power. The wind is a moderate 12 mph from the ENE. This is big, heavy, and only for the most experienced. The crowd factor at Rockpiles is “sometimes,” so it might get busy, but with this size, the lineup will thin out.

The start of September sees the swell ease but still hold solid. Tuesday 1 September has 7ft from the east, with period easing to 8–9 seconds, and energy still very strong (1841 to 1131). Wednesday 2 September drops to 5ft, but the period lengthens to 10 seconds – a nice groundswell pulse. The energy is still strong (1169 to 1188) and the wind is a moderate 12–19 mph from the NE. A solid option for experienced surfers.

So, the first week is a slow grind. The real gold is the weekend of 29–30 August, with Saturday afternoon being the pick for expert-level waves in clean conditions. The swell is big, the energy is extreme, and if you’re up for it, that’s the one.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Tue night). Winds decreasing (fresh winds from the ENE on Tue afternoon, calm by Thu night).

Days 4-6 Weather Summary

Mostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Winds increasing (calm on Fri morning, strong winds from the ENE by Sun morning).

Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
Monday
24
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
1
1
1
2
1
2
2
1
2
1
0
0
1
0
0
1
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)
1.3
ENE
7
1
E
8
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
2.3
E
7
2.1
E
7
2
ENE
7
2.2
ENE
7
2.1
ENE
7
2.4
ENE
8
Wave Graph
Metric surfscale
Energy kJ
165
120
155
129
100
129
207
200
274
291
261
322
261
255
428
569
439
350
435
456
678
Wind (km/h)
25
ENE
25
NE
20
ENE
20
ENE
25
ENE
15
NE
15
ENE
10
NE
5
E
10
SE
5
E
15
ENE
35
ENE
40
ENE
30
ENE
40
ENE
40
ENE
35
NE
40
ENE
35
ENE
35
ENE
Wind State
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross-on
glassy
cross-off
cross-off
cross-off
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
2:26PM0.67m
2:21AM0.29m
Low Tide
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
6:59AM0.08m
9:35PM0.13m
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:09
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
Temp °C
25
26
25
25
26
25
26
27
26
26
27
26
26
26
26
26
26
25
26
26
25
Feels °C
23
23
24
25
25
26
27
29
29
29
30
28
26
23
24
23
23
22
23
24
23
  • Map Icons:
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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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