Castles Beach surf break

Castles Beach surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 pm Saturday 16 May 2026 HST
Forecast update in hr  min  s Forecast update imminent
Castles Beach surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castles Beach sea temperature is
25.3° C
(Which is normal for this time of year)

Best Forecast Surf Conditions for Castles Beach this week:

The most powerful waves expected at Castles Beach in the next 16 days are 2.5m 8s and forecast to arrive on Thursday (May 21) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 11s period and expected on Tuesday (May 19) at 11PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful11PM (Thu 21st May)8ft (2.5m) 8s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Moderate rain (total 10mm), heaviest on Sun night. Warm (max 25°C on Sat night, min 23°C on Mon night). Winds increasing (calm on Sat night, fresh winds from the ENE by Tue afternoon).

Days 5-7 Weather Summary

Some drizzle, heaviest during Thu night. Warm (max 24°C on Tue night, min 23°C on Tue night). Mainly strong winds.

Sunday
17
Monday
18
Tuesday
19
Wednesday
20
Thursday
21
Friday
22
Sat
23
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Rating
(10 max)
2
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
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
ENE
8
1.4
ENE
8
1.4
ENE
8
2.1
ENE
8
1.8
ENE
8
1.9
ENE
8
1.7
ENE
8
1.7
E
7
1.9
ENE
7
1.9
ENE
8
2.3
ENE
7
2.5
ENE
8
2.4
ENE
8
2.4
ENE
8
2.4
ENE
8
2.5
ENE
8
2.2
ENE
8
2.1
ENE
8
2.3
ENE
8
2.3
ENE
8
2.3
ENE
8
Wave Graph
Metric surfscale
Energy kJ
322
256
262
533
437
438
345
303
352
438
558
749
745
725
744
866
627
574
696
721
704
Wind (km/h)
0
S
15
ENE
25
ENE
30
E
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
30
ENE
35
ENE
40
ENE
35
ENE
40
ENE
40
ENE
40
ENE
35
ENE
35
ENE
35
ENE
35
ENE
35
ENE
glassy
cross-on
on
on
on
on
on
on
on
on
on
on
on
on
cross-on
cross-on
cross-on
cross-on
on
cross-on
cross-on
High Tide
1:32AM0.50m
3:56PM0.96m
2:04AM0.47m
4:46PM0.94m
2:36AM0.44m
5:38PM0.90m
3:08AM0.41m
6:33PM0.85m
4:03AM0.37m
7:29PM0.80m
6:51AM0.35m
8:23PM0.75m
9:44AM0.41m
Low Tide
9:49PM0.39m
8:11AM-0.05m
10:51PM0.40m
8:51AM-0.04m
00:02AM0.41m
9:32AM0.01m
1:30AM0.40m
10:16AM0.07m
3:16AM0.37m
11:05AM0.16m
3:54AM0.33m
12:06PM0.26m
4:21AM0.29m
1:41PM0.36m
thunderstorm
clear
rain showers
rain showers
rain showers
thunderstorm
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
rain showers
clear
clear
rain showers
rain showers
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:50
5:50
5:50
5:50
5:50
5:50
5:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:02
7:02
7:02
7:04
7:04
7:05
7:05
2
1
4
2
1
1
3
1
Temp °C
25
25
25
24
24
24
24
24
24
24
24
24
23
23
24
23
23
23
23
23
24
28
26
26
24
23
22
23
22
22
21
21
21
19
18
20
18
18
18
18
19
20
Swell 1
Height (m)
Direction
Period (s)
1.6
ENE
8
1.4
ENE
8
0.4
NNW
10
0.3
NNW
9
0.2
SSW
14
0.3
SSW
16
0.3
NW
11
0.4
NNW
12
0.4
NNW
11
0.4
NNW
11
0.4
NNW
10
0.5
NNW
11
0.4
NNW
10
0.3
NNW
10
0.3
NNW
10
0.3
SSW
15
0.4
NW
12
0.4
NNW
12
0.4
NNW
11
0.4
NW
11
0.4
NW
10
Energy kJ
322
256
38
17
20
48
19
54
47
45
42
65
43
19
19
42
37
56
49
29
27
Swell 2
Height (m)
Direction
Period (s)
0.4
NNW
10
0.4
NNW
10
0.3
SSE
7
0.3
SSW
15
0.2
NNW
13
0.2
NNW
12
0.2
SSW
14
0.3
SSW
14
0.3
SSW
17
0.3
NNW
12
0.2
SSW
14
0.2
SSW
14
0.2
S
16
0.3
S
16
0.2
SSW
16
0.2
NNW
9
0.2
S
14
0.2
S
14
0.3
S
16
0.3
S
16
0.4
S
15
Energy kJ
42
41
10
42
18
15
18
40
59
30
21
19
21
46
24
8
16
14
47
45
69
Swell 3
Height (m)
Direction
Period (s)
0.3
SSE
9
0.3
SSE
6
0.3
SSW
15
0.2
NNW
15
0.2
NNW
9
0.2
SSE
10
0.2
NNW
13
0.2
SSW
18
0.2
SSE
7
0.3
SSW
15
0.3
NNW
12
0.2
S
18
0.2
SSW
13
0.2
SSE
13
0.2
SSE
13
0.2
SSE
13
0.2
SSE
12
0.2
S
18
0.2
S
13
0.2
S
13
0.1
SE
12
Energy kJ
16
8
44
22
8
10
17
30
5
42
29
24
17
17
17
16
14
25
14
13
5
Wind waves
Height (m)
Direction
Period (s)
1.4
ENE
8
2.1
ENE
8
1.8
ENE
8
1.9
ENE
8
1.7
ENE
8
1.7
E
7
1.9
ENE
7
1.9
ENE
8
2.3
ENE
7
2.5
ENE
8
2.4
ENE
8
2.4
ENE
8
2.4
ENE
8
2.5
ENE
8
2.2
ENE
8
2.1
ENE
8
2.3
ENE
8
2.3
ENE
8
2.3
ENE
8
Energy kJ
262
533
437
438
345
303
352
438
558
749
745
725
744
866
627
574
696
721
704
Nearest Offshore or Glassy
Rating
(10 max)
2
2
2
1
2
2
2
1
2
2
2
1
1
1
1
1
1
1
1
1
1
Distance (km)
0
18
41
41
41
41
41
42
45
45
45
51
52
123
126
126
125
160
45
123
126
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
2
1
2
2
2
3
2
2
2
1
1
2
Best forecast wave conditions in United States
Rating
(10 max)
2
2
4
4
4
3
4
3
3
4
4
1
3
1
2
3
1
2
3
1
2
Header Global
Rating
(10 max)
4
6
4
4
4
5
4
5
4
5
6
5
5
9
5
4
5
5
4
4
4
  • Map Icons:
  • Break
  • 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 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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