Surf Forecasts:
Castles surf forecast from 13 Sep 2026:
- Best quality surf: Monday 14 Sep, 12AM (local time) - 4.5ft (1.3m), 14s period, SW swell with glassy winds.
- Most powerful swell: Sunday 20 Sep, 6AM (local time) - 7ft (2.1m), 16s period, SW swell with 2,259 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 12AM (local time) - 4.5ft (1.3m), 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 Monday (Sep 14) at 12AM. The primary swell is predicted to be 1.3m and 14s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 2.1m 16s and forecast to arrive on Sunday (Sep 20) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 5s period and expected on Tuesday (Sep 15) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Mon 14th Sep) | 4.5ft (1.3m) 14s |
| Best Surf | 12AM (Mon 14th Sep) | 4.5ft (1.3m) 14s |
| Most Powerful | 6AM (Sun 20th Sep) | 7ft (2.1m) 16s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright, let’s break it down. This is Rusty, and Castles is on the menu.
It starts off slow, with a few days of building swell that aren’t quite delivering. Then we get a solid run through the middle, and the final days are where the real firepower shows up. The combined swell energy readings go from moderate to very strong, hitting over 5000 by the end.
Water temp is about 60°, normal for the season.
Monday, September 14th. Early morning, glassy conditions on a 3ft SW swell, wind is only 3 mph from the ESE. That’s clean, that’s beautiful. The swell period is 11 seconds, a good groundswell. Energy is moderate. The afternoon gets a bit choppy.
Tuesday the 15th jumps to 5ft SW swell, 15-second period, clean with 19 mph cross-offshore wind. Long period at a reef means lined-up, powerful waves. Energy goes over 1000. Wednesday the 16th keeps it going with 6ft swell and clean conditions, energy pushing past 1300. Solid, but still not the peak.
Now, Monday the 22nd of September. Tuesday morning the 22nd is a gem: 5ft SW swell, 16-second period, clean with a light 6 mph cross-off breeze. Energy is 1330. This is prime for experienced surfers.
But the real monster is Sunday the 27th of September. A massive 10ft SW swell, 18-second period, combined energy of 5111 – that’s very strong. Morning winds are light and cross-offshore, keeping the surface clean. This is expert-only territory. At a reef, that long period will produce heavy, grinding sets. This is the absolute standout. Monday the 28th is also excellent, with 8ft SSW swell, clean, and light wind, energy at 3035.
There’s a quiet start, with nothing really happening until the 14th. After that, it’s a consistent run, though a lot of days are marginal due to wind or lump. Crowds can happen at Castles – “sometimes” means don’t expect it empty on the big days. The swell direction is mainly SW to SSW, which matches up nicely with the optimum WSW direction.
So, the main event runs from the 22nd to the 28th, with the 27th as the big one. Don’t forget the clean little session on the 14th morning to get your feet wet.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Mon morning, min 8°C on Tue night). Winds increasing (calm on Sun night, fresh winds from the ESE by Tue night). | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 12°C on Wed afternoon). Winds increasing (light winds from the E on Thu afternoon, strong winds from the N by Sat morning). | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | SW 16 | SW 14 | SW 11 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 18 | SW 16 | SW 14 | SW 13 | WSW 13 | SW 17 |
Wave Graph  | ||||||||||||||||||||
 kJ | 627 | 676 | 166 | 390 | 567 | 1014 | 1092 | 911 | 1246 | 1306 | 975 | 658 | 416 | 336 | 157 | 310 | 132 | 113 | 331 | 1450 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | on |
High Tide | 1:14AM1.30m | 1:09PM1.14m | 1:31AM1.32m | 1:19PM1.09m | 1:48AM1.30m | 1:29PM1.04m | 2:06AM1.24m | 1:37PM0.97m | 2:22AM1.15m | 1:38PM0.90m | 2:36AM1.02m | 1:21PM0.83m | 2:39AM0.88m | |||||||
Low Tide | 7:01PM-0.05m | 7:19AM0.05m | 7:11PM-0.08m | 7:37AM0.10m | 7:23PM-0.08m | 7:53AM0.17m | 7:36PM-0.05m | 8:08AM0.26m | 7:47PM0.01m | 8:19AM0.37m | 7:53PM0.09m | 8:21AM0.50m | 7:48PM0.18m | |||||||
 |  | | | |  |  | | | |  | | | | | | | | | | |
 | — | — | 6:39 | — | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — |
 | 6:28 | — | — | 6:28 | — | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 14 | 16 | 16 | 14 | 13 | 13 | 12 | 13 | 15 | 13 | 18 | 21 | 21 | 23 | 26 | 26 | 28 | 31 | 16 |
Feels °C | 11 | 14 | 13 | 12 | 11 | 7 | 6 | 6 | 7 | 9 | 8 | 14 | 17 | 16 | 16 | 19 | 20 | 17 | 21 | 11 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 14 | SW 11 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 11 | SW 16 | SW 14 | SW 13 | SW 13 | — |
| kJ | 627 | 676 | 166 | 390 | 567 | 1014 | 1092 | 911 | 1246 | 1306 | 975 | 658 | 416 | 336 | 64 | 310 | 132 | 113 | 171 | — |
Swell 2 Height (m) Direction Period (s) | — | — | SW 14 | SW 18 | — | — | — | S 6 | — | — | S 6 | — | — | S 21 | SW 18 | — | — | SW 20 | SW 17 | — |
| kJ | — | — | 158 | 109 | — | — | — | 32 | — | — | 1 | — | — | 9 | 157 | — | — | 15 | 177 | — |
Swell 3 Height (m) Direction Period (s) | — | — | SW 19 | SW 14 | — | — | — | — | — | — | — | — | — | SSW 16 | SW 14 | — | — | — | — | — |
| kJ | — | — | 57 | 125 | — | — | — | — | — | — | — | — | — | 25 | 74 | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | — | — | SW 18 | SSE 3 | SSE 5 | SSE 5 | ESE 4 | ESE 4 | SSE 2 | SE 5 | ENE 3 | — | — | N 4 | NNW 4 | N 4 | NW 5 | WSW 13 | SW 17 |
| kJ | — | — | — | 79 | 8 | 40 | 50 | 20 | 22 | 1 | 40 | 4 | — | — | 12 | 7 | 12 | 46 | 331 | 1450 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 879 | 0 | 0 | 648 | 132 | 552 | 491 | 491 | 243 | 491 | 1 | 0 | 0 | 0 | 633 | 401 | 1 | 649 | 649 | 1227 |
Best forecast wave conditions in Nullarbor | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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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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