Castles Beach surf break

Castles Beach surfForecast / HAW – Oahu / USA

information circle16 Day Weather and Surf, issued 7 pm Friday 24 Apr 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
25.1° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Castles Beach this week:

The most powerful waves expected at Castles Beach in the next 16 days are 2.4m 7s and forecast to arrive on Saturday (May 02) 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 0.9m 12s period and expected on Thursday (Apr 30) at 2PM.

Wave TypeTime (HST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 2AM (Sat 2nd May)8ft (2.4m) 7s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Light rain (total 3mm), mostly falling on Fri night. Warm (max 24°C on Sat afternoon, min 23°C on Fri night). Mainly fresh winds.

Days 5-7 Weather Summary

Light rain (total 5mm), mostly falling on Mon night. Warm (max 24°C on Thu afternoon, min 22°C on Tue night). Mainly fresh winds.

Saturday
25
Sunday
26
Monday
27
Tuesday
28
Wednesday
29
Thursday
30
Fri
1
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
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
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Wave
Height (m)
Direction
Period (s)
1.7
NE
8
1.7
NE
8
1.4
NE
8
1.4
NE
8
1.3
NE
8
1.3
NE
8
1.4
NE
8
1.3
ENE
8
1.4
ENE
7
1.5
ENE
7
1.3
ENE
7
1.6
ENE
7
1.6
ENE
7
1.5
ENE
7
1.6
ENE
6
1.4
ENE
7
1.2
ENE
7
1.7
ENE
7
1.9
ENE
7
1.9
ENE
7
2.1
ENE
7
Wave Graph
Metric surfscale
Energy kJ
364
361
253
241
191
216
215
173
214
212
141
220
261
187
188
175
129
279
376
376
456
Wind (km/h)
30
NE
25
ENE
20
NE
20
ENE
20
ENE
20
ENE
20
E
20
ENE
25
ENE
25
E
25
ENE
30
ENE
35
ENE
25
ENE
30
ENE
25
ENE
30
ENE
30
ENE
35
ENE
30
ENE
30
ENE
cross-on
cross-on
cross-on
cross-on
on
cross-on
on
on
on
on
on
on
on
on
cross-on
on
on
cross-on
on
on
cross-on
High Tide
10:30PM0.74m
11:27AM0.44m
11:13PM0.72m
12:17PM0.54m
11:47PM0.70m
12:55PM0.63m
00:15AM0.66m
1:29PM0.71m
00:39AM0.62m
2:01PM0.77m
1:02AM0.59m
2:32PM0.82m
1:23AM0.55m
3:03PM0.84m
Low Tide
6:06AM0.28m
4:13PM0.32m
6:16AM0.24m
5:31PM0.33m
6:31AM0.19m
6:30PM0.34m
6:48AM0.15m
7:20PM0.35m
7:06AM0.12m
8:06PM0.36m
7:25AM0.09m
8:48PM0.37m
7:46AM0.07m
rain showers
clear
clear
rain showers
clear
clear
clear
clear
clear
thunderstorm
part cloud
clear
clear
clear
clear
clear
clear
rain showers
rain showers
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:03
6:03
6:01
6:01
6:01
6:00
6:00
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:52
6:52
6:53
6:53
6:54
6:54
6:54
6:55
1
2
4
1
1
Temp °C
23
23
24
23
23
24
23
24
24
23
23
23
23
23
23
23
23
24
23
24
24
20
20
23
22
22
24
22
24
23
22
21
21
20
21
20
20
21
22
20
21
21
Swell 1
Height (m)
Direction
Period (s)
0.4
NNW
12
0.7
NW
13
0.7
NW
13
0.7
NW
12
1.3
NE
8
0.7
NW
12
0.7
NW
11
0.6
NNW
11
0.6
NNW
10
0.4
NNW
10
0.4
NW
10
0.4
NW
14
0.5
NW
13
0.7
NW
14
0.7
NW
14
0.8
NNW
13
0.8
NNW
12
0.9
NNW
13
0.9
NNW
12
0.8
NNW
12
0.7
NNW
11
Energy kJ
56
183
175
149
191
135
123
78
73
42
27
46
79
214
189
202
190
261
237
177
109
Swell 2
Height (m)
Direction
Period (s)
0.4
NW
15
0.2
SSW
15
0.4
NNE
8
0.2
SSW
15
0.7
NW
12
0.2
SSW
14
0.2
E
8
0.4
NE
9
0.4
NE
9
0.2
NNE
10
0.4
NE
8
0.4
NW
10
0.2
NNW
16
0.2
NNE
10
0.3
NE
9
0.3
NE
9
0.5
NE
8
0.2
S
16
0.2
S
16
0.2
S
15
0.5
NW
16
Energy kJ
55
23
24
22
149
21
5
22
21
9
17
25
25
9
14
13
34
20
19
17
129
Swell 3
Height (m)
Direction
Period (s)
0.1
NW
12
0.1
S
12
0.2
SSW
16
0.1
S
9
0.2
SSW
15
0.2
ESE
8
0.2
SSW
14
0.2
SSW
13
0.1
SW
13
0.1
NE
8
0.3
NW
15
0.1
SW
12
0.2
NNE
10
0.1
SE
11
0.1
SE
10
0.1
SE
10
0.1
SE
10
0.1
SE
10
0.1
S
9
0.2
NNW
18
0.2
S
16
Energy kJ
5
3
24
2
21
6
19
17
7
3
33
6
9
5
4
4
4
4
2
31
19
Wind waves
Height (m)
Direction
Period (s)
1.7
NE
8
1.7
NE
8
1.4
NE
8
1.4
NE
8
1.3
NE
8
1.4
NE
8
1.3
ENE
8
1.4
ENE
7
1.5
ENE
7
1.3
ENE
7
1.6
ENE
7
1.6
ENE
7
1.5
ENE
7
1.6
ENE
6
1.4
ENE
7
1.2
ENE
7
1.7
ENE
7
1.9
ENE
7
1.9
ENE
7
2.1
ENE
7
Energy kJ
364
361
253
241
216
215
173
214
212
141
220
261
187
188
175
129
279
376
376
456
Nearest Offshore or Glassy
Rating
(10 max)
2
2
1
1
1
2
1
1
1
1
1
1
1
2
2
2
2
2
2
2
2
Distance (km)
41
41
41
18
41
41
18
41
41
41
41
42
41
41
47
41
41
45
45
45
42
Best forecast wave conditions in Oahu
Rating
(10 max)
2
2
3
3
3
3
2
2
2
1
1
1
2
2
2
2
2
2
2
2
3
Best forecast wave conditions in United States
Rating
(10 max)
2
2
3
3
3
3
2
3
3
2
1
1
2
2
2
2
2
2
4
2
3
Header Global
Rating
(10 max)
5
4
6
7
8
8
6
6
5
5
7
7
5
8
6
5
4
5
5
5
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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