Castles Beach Surf Break

Lat Long: 21.42° N 157.74° W

Castles Beach Surf Forecast and Surf Report

Issued: 7 am 19 Jul 2026 (local time)

Forecast update in  hr  min

Today's Castles Beach sea temperature is
26.4° C
0.2° 

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 19 Jul 2026:

  • Most powerful swell: Sunday 26 Jul, 2PM (local time) - 4.5ft (1.3m), 16s period, E swell with 848 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 1.3m 16s and forecast to arrive on Sunday (Jul 26) at 2PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 18s period and expected on Monday (Jul 20) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2PM (Sun 26th Jul)4.5ft (1.3m) 16s

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


Short Range Forecast

Light rain (total 9mm), mostly falling on Mon morning. Warm (max 25°C on Sun morning, min 24°C on Sun night). Mainly fresh winds.

Days 4-6 Weather Summary

Some drizzle, heaviest during Thu morning. Warm (max 25°C on Wed morning, min 24°C on Wed morning). Mainly fresh winds.

Sunday
19
Monday
20
Tuesday
21
Wednesday
22
Thursday
23
Friday
24
Saturday
25
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)
1.5
ENE
8
1.5
ENE
8
1.5
ENE
8
1.6
ENE
7
1.6
ENE
7
1.5
ENE
7
1.5
ENE
7
1.5
ENE
7
1.6
ENE
7
1.3
ENE
7
1.7
ENE
6
1.7
ENE
6
1.9
ENE
7
1.8
ENE
7
2.1
ENE
7
2.1
ENE
7
2.1
ENE
7
2.2
ENE
8
2.1
ENE
8
2.1
ENE
8
2
ENE
8
Wave Graph
Metric surfscale
Energy kJ
273
284
270
263
256
204
195
200
227
153
198
219
316
299
407
419
444
512
508
517
502
Wind (km/h)
30
ENE
30
ENE
25
ENE
20
ENE
25
NE
20
ENE
20
ENE
25
ENE
30
ENE
30
ENE
30
ENE
30
ENE
35
ENE
30
ENE
30
ENE
30
ENE
35
ENE
30
ENE
25
NE
35
ENE
25
ENE
Wind State
on
cross-on
on
cross-on
cross-on
on
on
on
on
on
cross-on
on
on
on
on
on
on
on
cross-on
cross-on
on
High Tide
5:48PM0.68m
8:04AM0.54m
5:54PM0.61m
10:10AM0.59m
5:15PM0.56m
11:42AM0.65m
12:30PM0.71m
1:05PM0.75m
1:36PM0.79m
11:19PM0.41m
Low Tide
11:24AM0.37m
1:03AM0.23m
12:17PM0.48m
1:41AM0.22m
2:38PM0.55m
2:27AM0.21m
3:25AM0.19m
4:27AM0.17m
5:23AM0.14m
9:11PM0.40m
clear
clear
clear
rain showers
clear
rain showers
rain showers
rain showers
rain showers
clear
clear
clear
rain showers
clear
clear
clear
part cloud
clear
part cloud
rain showers
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:58
5:58
5:58
6:00
6:00
6:01
6:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:15
7:15
7:14
7:14
7:14
7:13
7:13
 mm
1
3
2
1
2
1
2
Temp °C
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
Feels °C
24
23
23
25
24
25
25
24
23
23
23
22
22
22
22
23
23
22
24
22
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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Quick surf report for Castles Beach:

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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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