
Surf Forecasts:
Castles surf forecast from 9 Sep 2026:
- Best quality surf: Wednesday 16 Sep, 3AM (local time) - 5ft (1.6m), 14s period, SW swell with offshore winds.
- Most powerful swell: Wednesday 9 Sep, 6PM (local time) - 8ft (2.4m), 17s period, SSW swell with 3,260 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 3AM (local time) - 4.5ft (1.4m), 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 Friday (Sep 11) at 3AM. The primary swell is predicted to be 1.4m and 15s period with a secondary swell of 0.1m and 24s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 2.4m 17s and forecast to arrive on Wednesday (Sep 09) at 6PM. 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 Thursday (Sep 10) at 3AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 11th Sep) | 4.5ft (1.4m) 15s |
| Best Surf | 3AM (Wed 16th Sep) | 5ft (1.6m) 14s |
| Most Powerful | 6PM (Wed 9th Sep) | 8ft (2.4m) 17s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s look at what’s cooking for us over the next couple of weeks.
We’ve got a classic slow burn kicking off. The first few days are a write-off – Wednesday the 9th and Thursday the 10th are plagued by strong onshore and cross-off winds, making for a messy, blown-out scene. We don't really get anything worth paddling out for until Friday morning the 11th. That’s when things start to turn.
The standout window is without a doubt Wednesday the 16th. Castles (reef) will be firing. We’re looking at a solid 6ft of SW groundswell with a very long 16-second period. That kind of period means proper energy and long lulls between sets, perfect for picking off the good ones on a reef setup. The wind is a light breeze, making for clean, lined-up waves. This is the pick of the fortnight. The combined wave energy is strong at 1357. It’s a bit too big and powerful for beginners though; this one’s for the experienced crew.
Leading up to that, Friday the 11th offers a decent warm-up with 4ft SW swell (15-second period) and clean offshore winds. It’s smaller but fun, with moderate energy (707). Keep an eye on Tuesday morning the 15th – we get a bump of 6ft SW swell (14-second period) under cross-off winds, though the energy is moderate (1147) and conditions are cleaner than the weekend drivel.
The weekend of the 12th and 13th is a wipeout. Saturday has tiny 4ft swell with cross-off winds, and Sunday turns downright ugly with cross-on winds making it choppy and poor. Forget it.
After the Wednesday the 16th highlight, the swell drops again. Thursday morning the 17th still has clean 4ft surf, but the afternoon gets shredded by a fresh SSE wind. Then Friday the 18th is small but clean in the morning.
We then hit a big dead zone from the 19th to the 20th – strong winds and tiny swell. You're looking at a solid 3-day gap with no real surf. The next glimmer comes on Monday morning the 21st with a clean 5ft SW swell (13-second period), offering very good conditions under light offshore winds.
Be warned: Tuesday the 22nd kicks up a serious swell – 8ft to 10ft of SW groundswell. This is big, powerful stuff (energy at 4766), but winds are from the south, creating a cross-chop. It’s one for experts only. Wednesday the 23rd is a total washout with a near-gale blowing onshore, making a mess of it.
The water temp is sitting at 61°, which is pretty much normal for this time of year, so no surprises there.
Crowds at Castles are sometimes an issue, so on the good days, expect some company in the water. And remember, this is a reef break, so choose your line carefully. For the long range, the Wednesday the 16th window is the one to circle on your calendar, but it’s still a bit out so keep an eye on the forecasts.
Signing off, Rusty.
Short Range ForecastMostly dry. Warm (max 24°C on Sat morning, min 10°C on Wed night). Winds decreasing (strong winds from the ESE on Wed night, light winds from the E by Fri afternoon). | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Sat afternoon, min 12°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | SSW 18 | SW 16 | SW 16 | SSW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 17 | SW 16 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 14 | SW 14 | SW 14 |
Wave Graph | ||||||||||||||||||||
3553 | 2187 | 1571 | 1460 | 893 | 685 | 753 | 746 | 742 | 546 | 307 | 515 | 416 | 262 | 241 | 238 | 211 | 1407 | 1218 | 1049 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | off | cross-off | cross-off | off | off | off | cross-off | cross | cross-off | cross-on | cross-on | cross | cross-off | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 00:26AM0.90m | 12:24PM1.29m | 00:33AM1.03m | 12:37PM1.26m | 00:44AM1.14m | 12:48PM1.22m | 00:58AM1.24m | 12:58PM1.18m | 1:14AM1.30m | 1:09PM1.14m | 1:31AM1.32m | 1:19PM1.09m | 1:48AM1.30m | |||||||
Low Tide | 6:43PM0.10m | 6:04AM0.12m | 6:44PM0.07m | 6:23AM0.05m | 6:47PM0.04m | 6:43AM0.02m | 6:53PM-0.01m | 7:01AM0.02m | 7:01PM-0.05m | 7:19AM0.05m | 7:11PM-0.08m | 7:37AM0.10m | 7:23PM-0.08m | |||||||
— | — | 6:43 | — | — | 6:43 | — | — | 6:41 | — | — | 6:39 | — | — | 6:39 | — | — | 6:37 | — | — | |
6:24 | — | — | 6:25 | — | — | 6:27 | — | — | 6:27 | — | — | 6:28 | — | — | 6:28 | — | — | 6:29 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 13 | 15 | 18 | 18 | 19 | 20 | 20 | 24 | 27 | 26 | 21 | 19 | 16 | 17 | 17 | 15 | 17 | 18 | 19 |
Feels °C | 6 | 5 | 8 | 11 | 12 | 15 | 16 | 16 | 18 | 23 | 22 | 19 | 16 | 13 | 15 | 13 | 12 | 13 | 13 | 15 |
Swell 1 Height (m) Direction Period (s) | SSW 18 | SW 16 | SW 16 | SSW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 17 | SW 16 | SW 14 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 14 | SW 14 | SW 14 |
3553 | 2187 | 1571 | 1460 | 893 | 685 | 753 | 746 | 742 | 546 | 248 | 515 | 416 | 262 | 241 | 238 | 138 | 1407 | 1218 | 1049 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 26 | SW 25 | SW 24 | — | — | SW 18 | SW 20 | SW 18 | — | — | — | SW 19 | SW 18 | SW 16 | — | — | — |
— | — | — | 26 | 25 | 22 | — | — | 392 | 66 | 307 | — | — | — | 57 | 111 | 211 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | WSW 6 | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 4 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | S 18 | ESE 5 | E 4 | SE 3 | E 2 | ENE 3 | — | — | NE 3 | — | NNE 3 | NNW 3 | SW 16 | — | — | S 4 | SSE 5 | SE 2 | SSE 2 | SSE 2 |
160 | 40 | 15 | 2 | 1 | 3 | — | — | 2 | — | 3 | 2 | 64 | — | — | 13 | 49 | 1 | 1 | 1 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1620 | 1577 | 491 | 491 | 132 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 401 | 1 | 1 | 1242 | 1 | 1 | 361 |
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.










