Castles Beach Surf Break

Lat Long: 21.42° N 157.74° W

Castles Beach Surf Forecast and Surf Report

Issued: 1 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Castles Beach sea temperature is
27.0°C
0.1° 

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 4 Sep 2026:

  • Most powerful swell: Saturday 5 Sep, 2AM (local time) - 7.5ft (2.3m), 14s period, ENE swell with 2,041 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 2.3m 14s and forecast to arrive on Saturday (Sep 05) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 15s period and expected on Monday (Sep 07) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sat 5th Sep)7.5ft (2.3m) 14s

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


Short Range Forecast

Heavy rain (total 25mm), heaviest during Sun afternoon. Warm (max 26°C on Fri morning, min 25°C on Fri afternoon). Mainly fresh winds.

Days 4-6 Weather Summary

Moderate rain (total 10mm), heaviest on Mon morning. Warm (max 28°C on Tue morning, min 25°C on Wed night). Winds decreasing (fresh winds from the SSE on Mon night, light winds from the SSE by Tue night).

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
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
1
2
0
1
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)
1
E
14
1.2
E
14
2.3
ENE
14
2.2
ENE
14
1.5
E
13
2.2
ENE
13
2.1
E
12
1.4
E
12
2.4
E
12
1.4
E
13
1.6
ENE
13
2
ENE
12
1.9
ENE
11
1.6
ENE
10
1.2
NE
9
0.8
E
14
1.2
ENE
8
1.7
ENE
7
1.5
ENE
7
0.8
E
14
1.7
ENE
8
Wave Graph
Metric surfscale
Energy kJ
404
577
2041
1665
792
1592
1334
566
1785
653
888
1158
853
551
237
236
171
277
236
236
336
Wind (km/h)
35
ENE
30
ENE
30
ENE
25
ENE
25
ENE
20
ENE
30
ENE
20
ENE
25
ENE
30
ESE
30
SE
30
SSE
20
S
15
SSE
10
E
15
ENE
20
ENE
30
ENE
35
ENE
30
ENE
30
ENE
Wind State
cross-on
cross-on
cross-on
on
cross-on
on
on
on
on
on
cross-on
cross
cross
cross-on
on
on
cross-on
on
cross-on
cross-on
on
High Tide
10:21AM0.72m
11:33AM0.78m
12:19PM0.83m
11:14PM0.40m
12:55PM0.86m
00:19AM0.47m
1:27PM0.87m
1:08AM0.54m
1:55PM0.86m
1:52AM0.61m
2:20PM0.82m
2:33AM0.67m
Low Tide
2:15AM0.17m
4:01AM0.16m
7:47PM0.35m
5:17AM0.13m
7:50PM0.31m
6:14AM0.11m
8:04PM0.27m
7:02AM0.11m
8:22PM0.23m
7:46AM0.14m
8:42PM0.19m
clear
clear
rain showers
clear
clear
rain showers
part cloud
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
clear
part cloud
rain showers
part cloud
clear
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:15
6:15
6:15
6:15
6:16
6:16
6:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:44
6:43
6:42
6:40
6:39
6:38
6:38
 mm
1
3
8
13
2
2
1
1
2
2
1
Temp °C
26
26
25
26
26
26
26
26
26
27
27
27
28
28
27
26
26
26
26
26
26
Feels °C
23
23
22
25
25
25
25
26
25
27
26
27
30
29
30
28
27
26
23
23
23
  • 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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