Surf Forecasts:
Castles surf forecast from 5 Aug 2026:
- Best quality surf: Thursday 6 Aug, 9PM (local time) - 5.5ft (1.7m), 16s period, SW swell with offshore winds.
- Most powerful swell: Monday 10 Aug, 3AM (local time) - 11ft (3.5m), 18s period, SW swell with 8,199 kJ wave energy.
- Next surfable swell (1★+): Thursday 6 Aug, 6AM (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 Thursday (Aug 06) at 6AM. The primary swell is predicted to be 1.1m and 16s period with a secondary swell of 0.4m and 5s. Another secondary swell of 0.1m and 6s is also forecast. 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 3.5m 18s and forecast to arrive on Monday (Aug 10) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Aug 07) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 6th Aug) | 3.5ft (1.1m) 16s |
| Best Surf | 9PM (Thu 6th Aug) | 5.5ft (1.7m) 16s |
| Most Powerful | 3AM (Mon 10th Aug) | 11ft (3.5m) 18s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright, Rusty here with the 16-day outlook for Castles.
Water temp is 60°F, right around the average for this time of year. The first session to look at is Wednesday the 5th of August. Morning is a bit shaky – 0.7m (2ft) of long-period SW groundswell, cross-shore wind, and the combined energy is moderate at 540. Afternoon improves to 1.1m (4ft), but still not perfect.
Thursday the 6th is cleaner. Morning has a cross-offshore breeze and 1.1m (4ft) of SW swell. The energy is at 597. That’s a solid, surfable wave. The afternoon is a bit bigger at 1.3m (4ft) but the wind turns cross-shore, so the morning wins.
Friday the 7th is a real highlight. The swell is 1.6m (5ft) with a 16-second period, cross-offshore wind, and the combined energy jumps to 1364 – strong. This is a consistent spot, so expect a proper session. The afternoon stays clean with a similar 1.5m (5ft) swell.
The weekend is a write-off. Saturday the 8th has strong cross-shore winds and messy surf. Sunday the 9th is a total loss – 2.5m to 3.0m (8ft to 10ft) of short-period, wind-blown junk with onshore winds up to 34 mph. This is kite-surfing territory, not paddle.
The whole next week, from Monday the 10th through Thursday the 13th, is a mix of big swell (2.4m to 3.5m, or 8ft to 12ft) and strong onshore winds. The energy is massive (up to 9263), but it’s rough and choppy. Not worth it.
Saturday the 15th offers a small break – 1.6m to 1.8m (5ft to 6ft), light cross-shore wind, and the energy is down to 1532. It’s marginal.
Now, the absolute standout is Wednesday the 19th of August. The swell is 1.7m to 1.8m (6ft to 6ft) from the SW, with a 17-second period. The energy is 1643 to 1904. The wind is the key – morning offshore from the ENE, and afternoon glassy calm. The report says “excellent surf conditions for experienced surfers.” At this size, it’s not for beginners, but for anyone else, this is the day. The reef will handle the long period perfectly.
Thursday the 20th closes out with a clean 1.3m (4ft) morning. A nice way to finish.
Bottom line: the first week has a few decent days, but the 19th is the one. Mark it.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Fri afternoon. Very mild (max 19°C on Fri morning, min 14°C on Wed night). Winds increasing (light winds from the ESE on Thu morning, strong winds from the N by Fri morning). | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Sat night. Warm (max 20°C on Sat afternoon, min 11°C on Sun morning). Mainly strong winds. | ||||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 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 19 | SW 18 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | WSW 14 | WSW 9 | SW 10 | SW 18 | SW 17 | SW 16 | SW 16 | WSW 10 | WSW 14 | SW 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 361 | 694 | 581 | 567 | 909 | 1494 | 1256 | 1145 | 1052 | 964 | 936 | 947 | 1350 | 1865 | 5422 | 3579 | 2193 | 1531 | 1527 | 3555 | 4652 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross-off | cross | off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | on | on | on | cross-on | cross-on | cross-on | on | on | on |
High Tide | 2:52PM0.90m | 3:49AM0.95m | 2:24PM0.75m | 4:31AM0.85m | 11:17AM0.96m | 2:07AM0.58m | 11:38AM1.14m | 1:00AM0.58m | 12:03PM1.28m | 00:48AM0.63m | 12:27PM1.36m | 00:49AM0.71m | |||||||||
Low Tide | 9:08PM0.19m | 9:37AM0.53m | 8:59PM0.25m | 9:18AM0.74m | 8:14PM0.26m | 7:25PM0.20m | 4:19AM0.56m | 7:12PM0.14m | 5:06AM0.41m | 7:16PM0.11m | 5:37AM0.27m | 7:23PM0.11m | |||||||||
 |  |  |  | | | |  |  | |  |  |  | |  | | | | | | | |
 | 7:24 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — |
 | — | 6:02 | — | — | 6:04 | — | — | 6:05 | — | — | 6:05 | — | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — |
mm | — | — | — | — | — | — | — | 3 | 2 | — | 1 | 4 | 3 | 1 | — | — | — | 4 | — | — | — |
Temp °C | 17 | 18 | 15 | 16 | 17 | 18 | 19 | 16 | 16 | 18 | 20 | 15 | 12 | 13 | 14 | 15 | 16 | 15 | 14 | 14 | 14 |
Feels °C | 11 | 14 | 13 | 15 | 15 | 14 | 12 | 10 | 11 | 13 | 15 | 10 | 1 | 3 | 9 | 7 | 9 | 11 | 7 | 6 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 19 | SW 18 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 17 | SW 16 | SW 16 | SW 15 | — | — | — | — | SW 17 | SW 16 | SW 16 | — | — | — |
| kJ | 361 | 694 | 581 | 567 | 909 | 1494 | 1256 | 1145 | 1052 | 964 | 936 | — | — | — | — | 3579 | 2193 | 1531 | — | — | — |
Swell 2 Height (m) Direction Period (s) | SW 15 | SSW 9 | WSW 6 | SW 5 | S 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 134 | 31 | 7 | 6 | 17 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | SSW 10 | — | S 8 | SSE 8 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 36 | — | 5 | 12 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | N 3 | SW 18 | SW 6 | — | — | — | NNW 4 | NW 4 | NNW 4 | WNW 5 | W 5 | WSW 14 | WSW 9 | SW 10 | SW 18 | — | W 6 | NW 4 | WSW 10 | WSW 14 | SW 17 |
| kJ | 5 | 81 | 2 | — | — | — | 33 | 13 | 7 | 39 | 17 | 947 | 1350 | 1865 | 5422 | — | 64 | 29 | 1527 | 3555 | 4652 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 178 | 1 | 0 | 1 | 0 | 402 | 1 | 0 | 564 | 1227 | 402 | 648 | 969 | 1229 | 510 | 510 | 1045 | 1510 | 1638 | 1344 |
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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