
Surf Forecasts:
Castles surf forecast from 14 Sep 2026:
- Best quality surf: Sunday 20 Sep, 9PM (local time) - 6ft (1.9m), 12s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 16 Sep, 3PM (local time) - 5.5ft (1.7m), 15s period, SW swell with 1,306 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 12AM (local time) - 3.5ft (1.1m), 16s 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 Tuesday (Sep 15) at 12AM. The primary swell is predicted to be 1.1m and 16s 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 15s and forecast to arrive on Wednesday (Sep 16) at 3PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Tuesday (Sep 15) at 9PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 15th Sep) | 3.5ft (1.1m) 16s |
| Best Surf | 9PM (Sun 20th Sep) | 6ft (1.9m) 12s |
| Most Powerful | 3PM (Wed 16th Sep) | 5.5ft (1.7m) 15s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Let's take a look at what we've got coming up at Castles. It's a reef setup, consistent, and exposed to swell, so it's a spot that can pick up some decent energy. The water temp is sitting at 61°, which is only a little warmer than average for this time of year, so nothing too crazy.
Right off the bat, don't go paddling out this Monday afternoon. We've got a modest 3ft SW swell, but the wind is cross/on from the south at 12 mph, and it's choppy. The combined energy is only moderate (703), and the surf report just says "poor". It's a write-off.
Tuesday morning the 15th is where it starts to wake up. That SW groundswell builds to 5ft with a 15 second period. Energy jumps up to strong (1080). The wind is a cross-off from the southeast, 19 mph, but the report says it's clean. That's a decent combination, even if the conditions are still a bit marginal. That long period means the sets will be powerful, with long gaps between them, making the paddle out a bit easier. Tuesday afternoon is much the same, 5ft and clean.
Wednesday the 16th is the best bet of this first run. Solid 6ft of SW groundswell with that 15 second period, and the morning has strong energy (1246) with a cross-off breeze. The afternoon cleans up even more, energy hits 1306, and the wind is a moderate breeze out of the southeast, still cross-off and clean. This is the one to aim for.
Thursday the 17th morning drops a touch to 4ft, but the afternoon is a real standout. A gentle breeze from the ENE at 9 mph, *offshore* wind. It's clean, glassy conditions on a 4ft SW groundswell. The energy is moderate (422), but that light offshore wind makes all the difference for a smooth face. That Friday the 18th and Saturday the 19th? Forget it. The swell drops hard to under 3ft, the wind is all over the place, and the energy is weak. The surf is poor.
Now, Sunday the 20th sees a new pulse. A longer period WSW swell comes in at 4ft to 5ft, with very strong energy (1337 to 1516). But the wind is cross/on from the south, which will mess it up, making it choppy. Keep your expectations low.
Here's the real bright spot: Monday the 21st morning. We get a 4ft SW groundswell, but the wind swings to a gentle offshore from the ENE at 9 mph. "Expect very good surf conditions" is what it says. Clean lines, gentle offshore wind. That's a window you want to be in. The energy is moderate (609), but that wind makes it premium.
Tuesday the 22nd morning is also very good. Another offshore breeze from the ENE, 5ft of SW groundswell with a 15 second period, and strong energy (836). That's clean and powerful. The afternoon dies as the wind turns onshore.
After a weak, choppy Wednesday the 23rd and Thursday the 24th, things get interesting again on Friday the 25th. A bigger SW groundswell pushes in, 7ft in the morning with a 16 second period. That's very long period, super powerful. The combined energy is a massive 2166. The wind is a cross-off from the north-northeast, and it's clean. This is for experienced surfers only—over 8ft, it's expert territory, but at 7ft it’s still big and powerful, and the long period groundswell will be best for this reef. The Saturday the 26th is a write-off though, with strong onshore winds and messy surf.
So, to wrap it up: the standout sessions are Wednesday the 16th afternoon, and that clean offshore window on Monday the 21st morning. For the second week, keep an eye on Friday the 25th morning for a big, powerful swell with clean conditions, but it's a way off, so don't set your watch by it yet.
Rusty.
Short Range ForecastMostly dry. Very mild (max 19°C on Thu morning, min 8°C on Tue night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 32°C on Sat afternoon, min 14°C on Sat night). Winds decreasing (strong winds from the N on Sat morning, light winds from the SSW by Sat night). | |||||||||||||||||||
Mon 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 14 | SW 16 | SW 15 | SW 14 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SSW 13 | SW 15 | SW 15 | SW 14 | SW 13 | SW 18 | W 17 | WSW 16 | WSW 15 | SW 12 |
Wave Graph | ||||||||||||||||||||
390 | 643 | 1028 | 1092 | 924 | 1246 | 1306 | 1118 | 658 | 422 | 304 | 262 | 215 | 128 | 113 | 84 | 593 | 838 | 1024 | 683 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross-off |
High Tide | 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 | 12:30PM0.81m | 2:04AM0.75m | |||||||
Low Tide | 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 | 7:48AM0.62m | 7:19PM0.24m | |||||||
— | — | 6:37 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | |
6:28 | — | — | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 14 | 13 | 13 | 12 | 13 | 15 | 14 | 19 | 22 | 21 | 23 | 27 | 26 | 29 | 32 | 15 | 17 | 16 | 14 |
Feels °C | 11 | 12 | 8 | 6 | 6 | 7 | 9 | 9 | 15 | 17 | 16 | 15 | 21 | 20 | 19 | 23 | 11 | 14 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 16 | SW 15 | SW 14 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SSW 13 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | — | SW 16 | SW 15 | SW 12 |
390 | 643 | 1028 | 1092 | 924 | 1246 | 1306 | 1118 | 658 | 422 | 304 | 262 | 215 | 128 | 113 | 84 | — | 361 | 492 | 683 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | — | — | — | S 6 | — | — | — | — | — | SW 18 | SW 18 | — | — | SW 20 | SW 18 | SW 18 | SW 13 | — | SW 14 |
109 | — | — | — | 36 | — | — | — | — | — | 111 | 12 | — | — | 15 | 84 | 12 | 138 | — | 245 | |
Swell 3 Height (m) Direction Period (s) | SW 14 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
125 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 18 | — | SSE 5 | SSE 5 | ESE 4 | ESE 4 | SE 2 | E 4 | ENE 3 | — | — | N 3 | NNW 4 | N 3 | N 4 | NNW 4 | W 17 | WSW 16 | WSW 15 | SW 12 |
79 | — | 52 | 55 | 28 | 24 | 1 | 10 | 4 | — | — | 8 | 4 | 4 | 18 | 16 | 593 | 838 | 1024 | 52 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 633 | 0 | 491 | 491 | 491 | 243 | 132 | 1 | 0 | 0 | 0 | 564 | 401 | 1 | 564 | 401 | 510 | 1061 | 1236 | 0 |
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.










