Surf Forecasts:
Castles surf forecast from 22 Aug 2026:
- Best quality surf: Thursday 27 Aug, 6PM (local time) - 7ft (2.1m), 18s period, SW swell with offshore winds.
- Most powerful swell: Friday 28 Aug, 6AM (local time) - 8ft (2.5m), 16s period, WSW swell with 3,139 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 12AM (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 Sunday (Aug 23) at 12AM. The primary swell is predicted to be 1.5m and 15s period with a secondary swell of 0.7m and 19s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 2.5m 16s and forecast to arrive on Friday (Aug 28) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 4s period and expected on Thursday (Aug 27) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 23rd Aug) | 5ft (1.5m) 15s |
| Best Surf | 6PM (Thu 27th Aug) | 7ft (2.1m) 18s |
| Most Powerful | 6AM (Fri 28th Aug) | 8ft (2.5m) 16s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s coming down the line for the next couple of weeks.
The first real sniff of surf doesn’t show up until Saturday the 22nd of August, so we’re looking at a bit of a wait. The early part of the period is a write-off with poor conditions, but after that, there’s a definite pulse of energy building.
It all kicks off Saturday afternoon with a clean 5ft swell out of the SW, but it’s a bit of a tease. The wind is a cross-shore, and the wave comment says it’s marginal. Water temp is sitting at 60°, which is pretty much normal for the time of year. Not a stand-out session, but a start.
Sunday morning the 23rd picks up a notch. The swell holds at 5ft, still SW, and the period stretches to 17 seconds – that’s a proper groundswell, carrying some real grunt. The wind swings NNE and goes cross-off, so the face is clean. The combined energy is a solid 1267. This is the first real window of clean, rideable surf.
Then things get a bit messy for a few days. Monday and Tuesday (24th and 25th) are blown out by strong onshore winds. The swell gets bigger – Tuesday morning hits 6ft with a combined energy of 1719 – but the wind is from the S and SSW, making it choppy and lumpy. Not worth paddling out.
Wednesday the 26th is a hidden gem. Morning sees a 4ft SW swell, clean with a cross-off northerly. By the afternoon, the wind drops to a glassy 3 mph from the ENE. The period is 12 seconds, the energy is 342, and the waves are clean and peeling. It’s small, but for a glassy afternoon session, you can’t beat it. The water is still average temp for the time of year.
Thursday the 27th morning is clean but small – 3ft with a very long 21-second period. That’s a super long groundswell, which can be tricky at a reef break, but the wind is alright. The real standout is Thursday afternoon. The swell jumps to 7ft out of the SW, period 19 seconds, and the combined energy is a huge 2831. The wind is a gentle offshore northerly, making it clean. This is proper, powerful, clean surf for experienced surfers.
The best on offer is Friday the 28th of August. Morning session: 8ft of pure WSW groundswell, with a 16-second period. The combined energy reading is 5032 – that’s serious, powerful water. The wind is a light 3 mph from the NNE, cross-off, so the waves will be clean and lined up. This is big, expert-level surf. The afternoon stays solid at 7ft, still clean. If you’ve got the skills, this is the day.
The weekend (29th and 30th) drops off in size but stays clean. Saturday morning is a 3ft cross-off, nothing special. Sunday the 30th afternoon picks up again to 6ft with a 20-second period (energy 2561) and a clean cross-off wind. It’s a solid, clean option.
The first week of September (1st to 6th) is a mixed bag. Some clean mornings, like Wednesday the 2nd with 4ft and an offshore breeze, but the afternoons get crossed up or blown out. The 4th of September has a 6ft SW swell (energy 1308) but the wind is from the SSE, making it a bit lumpy. The real standout in this second week is the morning of the 28th of August – that’s the one to circle. After that, conditions get more uncertain, with a lot of poor surf and strong winds, especially from the 5th and 6th, where the wind is up to 28 mph. That’s more kite-surfing territory than paddle surfing.
Remember, long-range calls like that Friday the 28th are promising, but always keep an eye on the charts as we get closer.
Rusty.
Short Range ForecastLight rain (total 4mm), mostly falling on Sun night. Warm (max 20°C on Sun afternoon, min 14°C on Sat night). Winds increasing (light winds from the SSE on Sat afternoon, strong winds from the SSW by Mon afternoon). | Days 5-7 Weather SummarySome drizzle, heaviest during Fri morning. Warm (max 25°C on Thu afternoon, min 11°C on Tue night). Winds increasing (calm on Wed afternoon, fresh winds from the N by Thu morning). | |||||||||||||||||||
Sat 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SW 16 | SW 14 | SW 14 | SW 13 | SW 12 | SW 14 | SW 21 | SW 19 | SW 17 | WSW 16 | SW 16 | WSW 14 |
Wave Graph | ||||||||||||||||||||
936 | 924 | 1267 | 886 | 550 | 393 | 507 | 1242 | 1719 | 667 | 725 | 431 | 300 | 331 | 714 | 2831 | 1882 | 3024 | 2262 | 1126 | |
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-on | cross-on | cross-on | cross-on | cross-on | glassy | cross-off | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 2:55AM0.66m | 11:50AM0.92m | 1:02AM0.62m | 11:40AM1.06m | 00:18AM0.68m | 11:50AM1.19m | 00:13AM0.78m | 12:06PM1.30m | 00:22AM0.89m | 12:24PM1.38m | 00:36AM1.00m | 12:43PM1.41m | 00:53AM1.09m | |||||||
Low Tide | 8:02PM0.28m | 5:37AM0.64m | 7:09PM0.28m | 5:03AM0.50m | 6:40PM0.23m | 5:15AM0.35m | 6:35PM0.15m | 5:35AM0.21m | 6:40PM0.08m | 5:57AM0.09m | 6:51PM0.02m | 6:21AM0.00m | 7:04PM-0.02m | |||||||
— | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — | 7:03 | — | — | 7:01 | — | — | 7:01 | — | — | |
6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:17 | — | |
mm | — | — | — | — | 2 | 1 | — | 1 | — | — | — | — | — | — | — | — | — | 1 | — | — |
Temp °C | 17 | 15 | 19 | 20 | 17 | 16 | 15 | 14 | 14 | 14 | 12 | 16 | 19 | 20 | 22 | 25 | 23 | 20 | 18 | 18 |
Feels °C | 14 | 12 | 14 | 15 | 13 | 13 | 9 | 8 | 9 | 10 | 10 | 13 | 16 | 16 | 16 | 21 | 18 | 17 | 16 | 18 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | — | — | — | SW 14 | SW 14 | SW 13 | SW 12 | SW 14 | SW 14 | SW 19 | SW 17 | WSW 16 | SW 16 | WSW 14 |
936 | 924 | 1267 | 886 | 550 | 393 | — | — | — | 667 | 725 | 431 | 300 | 331 | 407 | 2831 | 1882 | 3024 | 2262 | 1126 | |
Swell 2 Height (m) Direction Period (s) | SW 21 | SW 19 | — | — | — | SW 20 | — | — | — | — | — | — | SW 16 | SW 24 | SW 21 | — | — | — | — | — |
285 | 369 | — | — | — | 15 | — | — | — | — | — | — | 42 | 22 | 714 | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | ESE 3 | NE 3 | — | NE 3 | N 3 | SW 14 | SW 13 | SW 16 | SW 7 | — | NNE 2 | — | NE 3 | N 4 | — | W 4 | WSW 16 | WSW 16 | — |
— | 3 | 5 | — | 9 | 6 | 507 | 1242 | 1719 | 122 | — | 1 | — | 2 | 35 | — | 9 | 2008 | 1479 | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1 | 0 | 178 | 1 | 1 | 489 | 243 | 491 | 1032 | 552 | 0 | 0 | 0 | 0 | 402 | 0 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Nullarbor | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
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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.











