Surf Forecasts:
Castles surf forecast from 15 Sep 2026:
- Best quality surf: Tuesday 22 Sep, 9AM (local time) - 5.5ft (1.7m), 15s period, SW swell with offshore winds.
- Most powerful swell: Tuesday 22 Sep, 3AM (local time) - 6ft (1.8m), 15s period, SW swell with 1,540 kJ wave energy.
- Next surfable swell (1★+): Thursday 17 Sep, 3AM (local time) - 5ft (1.5m), 15s 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 Thursday (Sep 17) at 3AM. The primary swell is predicted to be 1.5m and 15s period. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 1.8m 15s and forecast to arrive on Tuesday (Sep 22) at 3AM. 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+) | 3AM (Thu 17th Sep) | 5ft (1.5m) 15s |
| Best Surf | 9AM (Tue 22nd Sep) | 5.5ft (1.7m) 15s |
| Most Powerful | 3AM (Tue 22nd Sep) | 6ft (1.8m) 15s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright, this is Rusty. Let’s talk about what’s on offer for the next couple of weeks.
Look, I gotta be straight with you – the whole forecast window is a bit of a mixed bag. We’ve got consistent swell energy hitting us, but the wind and conditions aren’t always playing ball. The water temp is sitting about average for this time of year at 61°F , so nothing weird going on there.
The standout window, and the real reason to get excited, is the morning of Tuesday the 22nd of September. That’s the one to circle. We’re looking at 6ft of clean, long-period groundswell from the SW, with that period stretching out to a very long 15 seconds. That kind of period just means more push and better shape, especially for a reef like Castles. The wind will be light offshore out of the East, so expect glassy, clean faces. The combined energy is pumping at 1271 – that’s strong, powerful surf. This is for experienced surfers only; that’s a solid size and a lot of water moving around. The offshore wind will keep it lined up nicely.
Leading up to that, Thursday the 17th of September afternoon cleans up with 4ft SW swell and offshore East winds at just 10 km/h (6 mph). It’s smaller, but clean as a whistle. Then Monday the 21st of September morning has a similar small 4ft of SW swell with light cross-offshore wind, making for another clean option.
After the Tuesday peak, the surf settles down quite a bit. There’s a smaller pulse of 4ft on Wednesday the 23rd morning, but the wind switches cross-off from the NNE. The energy drops to 686 so it’s weaker, but still worth a look.
The end of the run tries to fire back up on Saturday the 26th of September with a big 7ft SW swell and a very long 18 second period. The combined energy is a massive 3030 – that’s some serious power. But, the wind is cross-onshore and there’s light rain. It’s going to be messy and choppy, which is a real shame for a swell that size. This one is for experts only, and even then, it’s a gamble. The following Sunday and Monday mornings are smaller, around 5ft, but see a strong, fresh cross-offshore wind that will keep things clean.
Overall, the best bet is that Tuesday morning. It’s the one that has size, power, and good wind all lining up. The rest of the time, you’ll be picking through smaller windows and hoping the wind plays fair.
Rusty.
Short Range ForecastMostly dry. Warm (max 23°C on Fri morning, min 8°C on Tue night). Winds decreasing (fresh winds from the SE on Tue night, light winds from the E by Thu afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 31°C on Sat afternoon, min 13°C on Sun night). Winds decreasing (fresh winds from the NNW on Sat morning, light winds from the SSW by Sat night). | |||||||||||||||||||
Tue 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | ||||||||||||||
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 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 18 | SW 16 | SW 11 | SW 14 | SW 13 | SW 10 | SW 15 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1092 | 1011 | 1246 | 1306 | 1103 | 742 | 485 | 253 | 322 | 215 | 127 | 87 | 83 | 108 | 306 | 286 | 658 | 380 | 173 | 1455 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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-on | cross-off | cross | cross-off |
High Tide | 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 | 11:30AM0.89m | 00:39AM0.70m | |||||||
Low Tide | 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 | 6:05AM0.64m | 6:31PM0.25m | |||||||
 |  |  | | | | | | | | | | |  | | | | | | | |
 | — | — | 6:35 | — | — | 6:35 | — | — | 6:33 | — | — | 6:31 | — | — | 6:31 | — | — | 6:30 | — | — |
 | 6:29 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:30 | — | — | 6:31 | — | — | 6:32 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 12 | 14 | 16 | 14 | 18 | 21 | 21 | 23 | 27 | 26 | 28 | 31 | 29 | 16 | 15 | 14 | 17 | 16 | 14 |
Feels °C | 7 | 6 | 8 | 9 | 9 | 14 | 17 | 16 | 15 | 21 | 20 | 19 | 22 | 23 | 14 | 11 | 12 | 14 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 15 | SW 15 | SW 15 | SW 15 | SW 14 | SW 14 | SW 13 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 6 | SW 11 | SW 14 | SW 13 | SW 10 | SW 15 |
| kJ | 1092 | 1011 | 1246 | 1306 | 1103 | 742 | 485 | 253 | 322 | 215 | 127 | 87 | 83 | 73 | 56 | 286 | 658 | 380 | 173 | 1455 |
Swell 2 Height (m) Direction Period (s) | — | S 6 | — | — | S 6 | — | — | SW 17 | — | — | — | SW 19 | SW 18 | SW 18 | SW 16 | SW 15 | — | — | SW 13 | — |
| kJ | — | 45 | — | — | 1 | — | — | 98 | — | — | — | 57 | 51 | 108 | 306 | 262 | — | — | 142 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | SW 16 | — | — | — | — | — | — | SW 16 | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 10 | — | — | — | — | — | — | 95 | — |
Wind waves Height (m) Direction Period (s) | SSE 6 | ESE 4 | E 4 | SE 2 | E 4 | ENE 2 | — | E 3 | N 3 | NNW 4 | N 3 | N 4 | NW 4 | SW 5 | SW 16 | SW 15 | SW 14 | — | SSW 13 | ESE 2 |
| kJ | 52 | 28 | 16 | 1 | 14 | 1 | — | 4 | 8 | 4 | 4 | 23 | 27 | 38 | 90 | 78 | 52 | — | 68 | 1 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 491 | 491 | 243 | 491 | 1 | 0 | 0 | 0 | 402 | 401 | 0 | 633 | 178 | 564 | 1217 | 1236 | 552 | 0 | 491 | 1 |
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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