Castles Beach Surf Break

Lat Long: 21.42° N 157.74° W

Castles Beach Surf Forecast and Surf Report

Issued: 7 pm 04 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castles Beach sea temperature is
26.8° C
0.3° 

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 5 Aug 2026:

  • Most powerful swell: Wednesday 5 Aug, 2AM (local time) - 4.5ft (1.4m), 10s period, ENE swell with 411 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 1.4m 10s and forecast to arrive on Wednesday (Aug 05) at 2AM. Winds are predicted to be 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 Thursday (Aug 06) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Wed 5th Aug)4.5ft (1.4m) 10s

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


Short Range Forecast

Light rain (total 4mm), mostly falling on Wed night. Warm (max 25°C on Tue night, min 24°C on Thu morning). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 2mm), mostly falling on Sun afternoon. Warm (max 25°C on Fri night, min 25°C on Fri night). Mainly fresh winds.

Wednesday
5
Thursday
6
Friday
7
Saturday
8
Sunday
9
Monday
10
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
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
ENE
10
1.3
ENE
10
1.2
ENE
9
1.3
ENE
9
1.2
ENE
6
0.9
ENE
6
0.9
ENE
5
0.9
ENE
5
1.1
ENE
5
1.4
ENE
6
1.6
ENE
6
1.6
ENE
7
1.8
ENE
7
1.9
ENE
7
1.9
ENE
7
1.8
ENE
7
1.7
ENE
7
1.6
ENE
7
1.6
ENE
7
Wave Graph
Metric surfscale
Energy kJ
411
312
237
273
84
53
34
50
64
135
200
212
285
336
355
328
301
276
247
Wind (km/h)
20
ENE
15
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
20
ENE
30
E
25
ENE
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
25
ENE
25
ENE
25
ENE
Wind State
on
on
cross-on
on
on
cross-on
cross-on
on
cross-on
on
cross-on
cross-on
on
on
cross-on
on
on
on
on
High Tide
8:35AM0.61m
5:05PM0.58m
10:38AM0.68m
11:52AM0.77m
12:41PM0.84m
9:57PM0.40m
1:22PM0.90m
11:49PM0.42m
1:59PM0.94m
00:53AM0.47m
Low Tide
00:39AM0.17m
1:20PM0.54m
1:33AM0.15m
2:46AM0.13m
4:07AM0.10m
8:55PM0.40m
5:18AM0.06m
8:36PM0.37m
6:16AM0.03m
8:52PM0.34m
part cloud
part cloud
part cloud
rain showers
light rain
rain showers
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
part cloud
rain showers
part cloud
part cloud
thunderstorm
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:05
6:05
6:05
6:05
6:07
6:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:07
7:07
7:07
7:06
7:06
7:05
7:04
 mm
1
2
1
1
1
Temp °C
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
Feels °C
26
26
25
26
26
25
25
24
25
25
24
23
24
24
24
24
25
25
25
  • 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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