Castles Beach Surf Break

Lat Long: 21.42° N 157.74° W

Castles Beach Surf Forecast and Surf Report

Issued: 1 am 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castles Beach sea temperature is
27.0° C
0.4° 

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


Castles Beach surf forecast from 12 Aug 2026:

  • Most powerful swell: Sunday 16 Aug, 8AM (local time) - 16ft (5.0m), 10s period, E swell with 5,550 kJ wave energy.

Best Forecast Surf Conditions for Castles Beach this week:

The most powerful waves expected at Castles Beach in the next 16 days are 5.0m 10s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 8s period and expected on Saturday (Aug 15) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 8AM (Sun 16th Aug)16ft (5.0m) 10s

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


Short Range Forecast

Some drizzle, heaviest during Fri night. Warm (max 26°C on Wed afternoon, min 25°C on Wed morning). Mainly fresh winds.

Days 4-6 Weather Summary

Heavy rain (total 40mm), heaviest during Sun morning. Warm (max 27°C on Sun night, min 25°C on Sat morning). Winds decreasing (gales from the ENE on Sun morning, moderate winds from the ESE by Sun night).

Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
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
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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
S
18
1.4
ENE
7
0.7
S
16
0.6
S
16
1.7
ENE
6
2
ENE
7
1.9
ENE
7
1.9
ENE
8
2.3
ENE
8
3
ENE
11
3
E
11
3.5
ENE
9
4
E
10
3
E
9
2.5
E
8
2
ENE
8
1.8
ENE
8
1.6
ENE
7
1.5
ENE
7
1.5
ENE
7
1.6
ENE
6
Wave Graph
Metric surfscale
Energy kJ
170
158
257
183
226
371
366
463
620
1969
2238
2317
3060
1507
903
472
346
245
187
187
207
Wind (km/h)
25
ENE
30
ENE
25
ENE
30
ENE
30
ENE
35
ENE
35
ENE
30
NE
35
ENE
40
ENE
40
NE
50
NE
60
E
35
ESE
20
ESE
25
ESE
25
E
25
ENE
25
ENE
25
ENE
20
ENE
Wind State
cross-on
cross-on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
on
on
on
on
on
on
cross-on
cross-on
on
High Tide
3:03PM0.92m
2:34AM0.55m
3:30PM0.88m
3:21AM0.59m
3:54PM0.82m
4:08AM0.61m
4:13PM0.75m
4:57AM0.62m
4:27PM0.68m
5:52AM0.61m
4:33PM0.62m
7:01AM0.60m
4:19PM0.57m
Low Tide
9:36PM0.27m
8:33AM0.07m
9:59PM0.24m
9:13AM0.15m
10:23PM0.21m
9:51AM0.24m
10:47PM0.20m
10:29AM0.33m
11:11PM0.19m
11:08AM0.42m
11:37PM0.19m
11:57AM0.50m
00:07AM0.20m
clear
clear
part cloud
part cloud
clear
clear
part cloud
clear
rain showers
rain showers
rain showers
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:07
6:07
6:07
6:09
6:09
6:09
6:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:02
7:01
7:01
7:00
7:00
6:59
6:59
 mm
1
2
2
7
11
4
8
3
3
Temp °C
25
26
26
26
26
26
26
26
26
26
26
26
25
26
27
26
26
25
25
25
25
Feels °C
24
24
24
24
24
24
23
24
24
24
24
24
18
22
27
26
27
24
23
23
24
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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Information about the Castles Beach Surf forecast

The above surf forecast table for Castles Beach provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castles Beach can be found by selecting the local surf guide option on the grey menu. Our Castles Beach 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 (Castles Beach) 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 Castles Beach 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.

Castles is 2 km (1 miles) from Kailua. If you plan a vacation in Oahu, look for hotels and other accommodation in Kailua. Kailua has rooms for a wide range of budgets as well as car hire and transport links.

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