Surf Forecasts:
Castles surf forecast from 4 Sep 2026:
- Best quality surf: Sunday 6 Sep, 3AM (local time) - 7ft (2.1m), 14s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 9PM (local time) - 8ft (2.5m), 17s period, SSW swell with 3,685 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 3AM (local time) - 7ft (2.1m), 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 (Sep 06) at 3AM. The primary swell is predicted to be 2.1m 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 2.5m 17s and forecast to arrive on Wednesday (Sep 09) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Monday (Sep 07) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 6th Sep) | 7ft (2.1m) 14s |
| Best Surf | 3AM (Sun 6th Sep) | 7ft (2.1m) 14s |
| Most Powerful | 9PM (Wed 9th Sep) | 8ft (2.5m) 17s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's coming our way at Castles, the only spot in the running for this period.
We're looking at a solid stretch of south-west swell, but it's a bit of a mixed bag for the first week. The water temp is sitting at 60°, which is pretty much normal for this time of year, so no need to worry about a wetsuit thickness change.
The first real standout is Sunday, the 6th of September. That morning, we’ve got a clean 7ft south-west swell, with a 14-second period. The real beauty is the offshore north-east wind, just a gentle breeze, so the faces will be glassy. The combined energy is a solid 1443 (moderate). This is the pick of the early window, and it's going to be a good one for experienced surfers.
The next big moment comes on Tuesday, the 8th of September. The early morning again is the call. A 5ft south-west swell, but check this out: a 17-second period. That's proper groundswell energy, and the combined energy is 1519 (strong). With a light east-south-east cross-off wind, it should be clean. This is a longer period, so it'll be a bit more powerful and the sets will be more spaced out – perfect for a reef break like Castles.
Now, looking further out, keep an eye on the 17th of September. The Thursday morning shows a 6ft south-west swell, a 17-second period, and a clean cross-off north-east wind, with a combined energy of 2142 (strong). The afternoon is just as good, with a 6ft swell and similar conditions. That's a long-range call, so less certain, but it has the potential to be the best swell of the whole run.
There is a bit of a gap in quality surf. After the 12th of September, things get messy with onshore winds, and you won't see anything decent again until the 16th at the earliest. The 20th of September is worth a mention – the Sunday morning brings a glassy 4ft south-west swell, perfect for a quiet paddle, but the energy is a bit average (676).
Overall, the best surf is on Sunday the 6th, Tuesday the 8th, and that promising window on the 17th. For the rest, you'll be picking through some lumpy, wind-affected conditions.
Rusty, signing off.
Short Range ForecastMostly dry. Very mild (max 15°C on Sun morning, min 11°C on Sat night). Winds decreasing (fresh winds from the WSW on Sat morning, light winds from the S by Sat night). | Days 4-6 Weather SummaryLight rain (total 9mm), mostly falling on Tue afternoon. Very mild (max 17°C on Thu afternoon, min 9°C on Wed night). Winds increasing (calm on Tue morning, strong winds from the SE by Wed afternoon). | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
AM | 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 12 | SW 13 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SW 18 | SW 17 | SW 16 | SW 16 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1945 | 2012 | 1912 | 1443 | 1033 | 444 | 336 | 482 | 850 | 1519 | 1276 | 1215 | 2248 | 2408 | 2912 | 2187 | 1869 | 1203 | 685 | 590 | 630 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | off | off | off |
High Tide | 12:18PM0.85m | 2:38AM0.77m | 11:43AM0.99m | 1:29AM0.68m | 11:44AM1.13m | 00:44AM0.70m | 11:57AM1.23m | 00:28AM0.79m | 12:11PM1.28m | 00:26AM0.90m | 12:24PM1.29m | 00:33AM1.03m | 12:37PM1.26m | 00:44AM1.14m | |||||||
Low Tide | 7:31PM0.13m | 6:09AM0.69m | 7:06PM0.13m | 5:24AM0.54m | 6:51PM0.12m | 5:29AM0.37m | 6:45PM0.11m | 5:45AM0.23m | 6:43PM0.10m | 6:04AM0.12m | 6:44PM0.07m | 6:23AM0.05m | 6:47PM0.04m | ||||||||
 | |  |  | |  |  | |  |  |  | | | | | | | | | | | |
 | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:47 | — | — | 6:46 | — | — | 6:43 | — | — | 6:43 | — | — |
 | — | 6:22 | — | — | 6:23 | — | — | 6:23 | — | — | 6:24 | — | — | 6:24 | — | — | 6:25 | — | — | 6:27 | — |
mm | — | — | — | — | — | — | — | — | — | 1 | 8 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 14 | 13 | 15 | 15 | 13 | 11 | 14 | 14 | 14 | 12 | 13 | 13 | 13 | 13 | 13 | 17 | 17 | 19 | 21 | 19 |
Feels °C | 7 | 8 | 10 | 12 | 10 | 8 | 6 | 10 | 10 | 11 | 6 | 8 | 5 | 7 | 5 | 7 | 11 | 11 | 13 | 16 | 14 |
Swell 1 Height (m) Direction Period (s) | — | — | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | SSW 13 | SW 18 | SW 17 | SW 16 | SW 16 | SW 17 | SW 18 | SW 17 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 14 |
| kJ | — | — | 1912 | 1443 | 1033 | 444 | 336 | 482 | 850 | 1519 | 1276 | 1215 | 2248 | 2408 | 2912 | 2187 | 1869 | 1203 | 685 | 590 | 630 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | SSW 6 | SW 21 | SW 20 | SW 13 | — | — | — | S 7 | — | — | — | SW 26 | SW 25 | SW 24 | SW 22 | — |
| kJ | — | — | — | — | — | 24 | 71 | 204 | 202 | — | — | — | 1 | — | — | — | 26 | 25 | 22 | 73 | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | SW 23 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | 21 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 12 | SW 13 | — | — | — | SE 4 | ESE 4 | SE 3 | SSE 5 | — | — | SSE 5 | SSE 6 | S 8 | ESE 4 | E 4 | ESE 2 | E 4 | ENE 4 | — | NE 2 |
| kJ | 1945 | 2012 | — | — | — | 32 | 26 | 1 | 39 | — | — | 41 | 123 | 221 | 37 | 16 | 1 | 13 | 8 | — | 1 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1035 | 1198 | 1 | 0 | 491 | 1 | 153 | 1 | 1 | 0 | 552 | 491 | 1626 | 1577 | 1229 | 491 | 132 | 0 | 0 | 0 | 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.
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