Castles Surf Break

Lat Long: 32.09° S 132.98° E

Castles Surf Forecast and Surf Report

Issued: 2 pm 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Castles sea temperature is
15.3° C
0.3° 

Castles surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Castles surf forecast from 16 Aug 2026:

  • Best quality surf: Saturday 22 Aug, 12AM (local time) - 5ft (1.6m), 16s period, SW swell with glassy winds.
  • Most powerful swell: Friday 21 Aug, 9AM (local time) - 5.5ft (1.7m), 17s period, SW swell with 1,682 kJ wave energy.
  • Next surfable swell (1★+): Sunday 16 Aug, 9PM (local time) - 3.5ft (1.1m), 14s period with SW swell.

Best Forecast Surf Conditions for Castles this week:

The surf forecast for Castles over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 16) at 9PM. The primary swell is predicted to be 1.1m and 14s period. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Castles in the next 16 days are 1.7m 17s and forecast to arrive on Friday (Aug 21) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Tuesday (Aug 18) at 9AM.

Wave TypeTime (ACST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sun 16th Aug)3.5ft (1.1m) 14s
Best Surf12AM (Sat 22nd Aug)5ft (1.6m) 16s
Most Powerful 9AM (Fri 21st Aug)5.5ft (1.7m) 17s

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


The Lowdown

G'day, I'm Rusty, and I've got the lowdown on the next couple of weeks at Castles (this is a reef setup, so we're not talking about a beach break here). The water's sitting at 60°, which is pretty much bang on average for this time of year, so no need to dig out the extra rubber just yet.

The first window of proper surf kicks off on Sunday afternoon, the 16th of August. It's a bit of a mixed bag to start, with a 4ft swell from the SW, but it's a long-period 14-second groundswell. The energy is moderate (650), and while the wind is a cross-off from the SE, the conditions are described as marginal and a bit questionable on the tide. We'll get a few, but it's not the pick of the week.

Monday the 17th is where it starts to clean up. Early morning you've got a smaller 3ft SW swell, but with a 16-second period and a clean offshore breeze from the ENE. The energy is moderate (519), and it's set to be a very good session. The afternoon holds a bit more size at 4ft from the SW, same long period, and a light cross-off. This is a solid, clean day.

Tuesday the 18th is a write-off. The morning has a 4ft SW swell but the wind is a strong 19 mph NNE cross-off, making for a clean but fresh breeze, and the quality is poor. The afternoon turns into a lumpy mess with a 19 mph NNW cross-shore. Give it a miss.

The pattern stays average through to the end of the week. Wednesday the 19th, Thursday the 20th, and Friday the 21st all see onshore or cross-onshore winds, with the swell hovering around 3ft to 6ft. The energy picks up to strong on Friday (1758), but the wind is onshore from the SW, so it's going to be a bit of a task. Hardly worth paddling out for.

Now, here's where it gets interesting. Saturday the 22nd of August is the first real standout. The morning delivers a 5ft SW swell with a 15-second period, and the wind is a light cross-off from the NE. The energy is strong (1113), and the conditions are clean and excellent for experienced surfers. This is the one to circle. Sunday the 23rd morning is also a cracker: 4ft from the SW, 14-second period, light cross-off from the north, and clean conditions. Another quality session.

The following week starts poorly. Monday the 24th is blown out with strong winds, and Tuesday the 25th is average with moderate offshore winds but the swell is small and short-period. The energy is weak.

But hold on to your boardies, because Saturday the 29th of August is a bomb. The morning is calling for a solid 8ft SW swell with an 18-second period, and the wind is absolutely glassy – zero knots from the east. The energy is massive (4113), and the conditions are excellent for experienced surfers. This is a big, powerful, groundswell on a reef, so it's going to be a serious session for the crew who can handle it. The afternoon drops to 8ft with a light cross-shore, still a beast.

The very end of the run on Sunday the 30th and Monday the 31st sees the swell drop back to 5ft and 3ft, with clean conditions but nothing to write home about.

So, the pick of the crop is hands down Saturday the 22nd morning for a solid, clean, long-period swell, and the absolute standout is Saturday the 29th morning for the big, glassy, groundswell session. That one is for the experts only.

Rusty.

Short Range Forecast

Some drizzle, heaviest during Sun afternoon. Warm (max 23°C on Tue afternoon, min 13°C on Mon night). Winds increasing (light winds from the ESE on Mon afternoon, strong winds from the N by Tue morning).

Days 5-7 Weather Summary

Mostly dry. Very mild (max 16°C on Thu morning, min 13°C on Thu night). Wind will be generally light.

Sun
16
Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
2
3
3
2
1
0
0
1
1
3
2
0
3
2
2
4
4
2
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
SW
14
1.1
SW
14
0.8
SW
16
1.1
SW
16
0.8
SW
19
1.1
SW
18
0.9
SW
17
0.9
SW
16
0.9
SW
15
1
SW
15
1.2
SW
15
1
SW
16
1.2
SW
16
1.5
SW
15
1.7
SW
17
1.7
SW
16
1.6
SW
16
1.6
SW
15
1.6
SW
16
1.5
SW
15
Wave Graph
Metric surfscale
Energy kJ
650
428
314
619
520
686
482
448
385
429
623
483
719
1028
1682
1492
1297
1091
1248
924
Wind (km/h)
15
SE
15
E
15
ENE
10
E
20
NNE
30
NNE
30
NNW
20
WSW
10
NW
15
SW
10
E
5
WNW
20
SSW
10
SSW
15
SW
10
S
5
SSE
10
NE
15
SSE
15
ENE
Wind State
cross-off
cross-off
off
cross-off
cross-off
cross-off
cross
on
cross-on
cross-on
cross-off
cross-on
cross-on
cross-on
on
cross-on
glassy
cross-off
cross
off
High Tide
1:58AM1.12m
1:49PM1.13m
2:19AM1.13m
1:59PM1.07m
2:40AM1.10m
2:07PM0.99m
3:00AM1.03m
2:07PM0.91m
3:19AM0.92m
1:48PM0.84m
3:31AM0.80m
12:48PM0.83m
2:55AM0.66m
Low Tide
7:51PM0.03m
7:53AM0.16m
8:02PM0.01m
8:12AM0.23m
8:15PM0.01m
8:30AM0.33m
8:28PM0.06m
8:43AM0.44m
8:36PM0.13m
8:44AM0.56m
8:33PM0.21m
7:56AM0.66m
8:02PM0.28m
rain showers
part cloud
clear
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
part cloud
clear
clear
clear
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:13
7:11
7:11
7:09
7:09
7:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:10
6:12
6:12
6:13
6:14
6:14
 mm
1
Temp °C
15
15
16
17
17
19
23
14
15
15
15
16
16
14
13
13
13
15
16
15
Feels °C
11
11
13
14
13
11
17
9
13
13
13
13
12
11
10
10
10
13
12
12
  • Map Icons:
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  • 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 Surf forecast

The above surf forecast table for Castles provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Castles can be found by selecting the local surf guide option on the grey menu. Our Castles 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) 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 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.

Are you planning a holiday in Nullarbor? If you are looking for accommodation near Castles, camping, hotels and holiday cottages in Nullarbor, consider staying in Thevenard which is 64 km (40 miles) away.

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