Surf Forecasts:
Castles surf forecast from 14 Aug 2026:
- Best quality surf: Saturday 15 Aug, 12PM (local time) - 6ft (1.8m), 16s period, SW swell with offshore winds.
- Most powerful swell: Thursday 20 Aug, 3AM (local time) - 6ft (1.8m), 17s period, WSW swell with 1,955 kJ wave energy.
- Next surfable swell (1★+): Saturday 15 Aug, 12PM (local time) - 6ft (1.8m), 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 Saturday (Aug 15) at 12PM. The primary swell is predicted to be 1.8m and 16s 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 17s and forecast to arrive on Thursday (Aug 20) 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 0.8m 4s period and expected on Tuesday (Aug 18) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Sat 15th Aug) | 6ft (1.8m) 16s |
| Best Surf | 12PM (Sat 15th Aug) | 6ft (1.8m) 16s |
| Most Powerful | 3AM (Thu 20th Aug) | 6ft (1.8m) 17s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright, let's get into it.
The next couple of weeks are a bit of a mixed bag for surf, to be honest. We’ve got a solid run of groundswell rolling in, but the wind’s not always going to be our friend. The first few days have some size, but we need to pick our moments. There’s a run of cleaner, smaller days in the middle that will be the pick, and then things get a bit messy again at the tail end as the wind clocks around.
The action kicks off on Friday the 14th. There’s a decent 6.9ft SW groundswell hitting, with a long 16-second period. The energy is strong, clocking in at 2166. But the wind is a bit of a let-down – a cross-shore from the SSE, which will put some chop on it. Not ideal, but there’s juice out there for the keen ones. Water temp is 59.4°, which is pretty much bang on average for this time of year.
Saturday the 15th sees the swell back off a touch to 5.6ft, but the wind swings around and cleans it up for the afternoon. Saturday morning is still workable with an east cross-off, but Saturday afternoon with an ESE cross-off and clean conditions looks like the better window. That energy is still chunky at 1384. This is where the weekend starts to look more inviting.
Sunday the 16th is when things get really interesting. The swell drops to 4.3ft, but we get a proper ENE offshore wind. The conditions will be glassy and clean, and the wave quality should be excellent. It won’t be big, but it’ll be fun. This is a session for getting some long, clean lines on the long-period SW groundswell.
Monday the 17th continues that good run. Clean offshore winds in the morning and afternoon with solid 2.6ft to 3.6ft of swell. It’s small, but it’ll be clean and rippable. A great day for the log or a high-performance shortboard if you’re good at generating speed.
Now, we got a blowout on Tuesday the 18th. The wind howls from the NNE at 25 mph, even though the waves are 3.6ft, it’s going to be a mess. A poor surf day. Not worth the paddle out unless you want a fight.
Wednesday the 19th brings some magic. 3.3ft of SW swell with glassy conditions. This is the standout of the first week for sure. Totally clean, small but perfectly formed waves. You’ll have the place to yourself, maybe. This is the pick for a relaxed session with some long, lined-up walls.
Thursday the 20th is a write-off. The wind swings onshore from the SW, creating lumpy, poor conditions as the swell bumps up to 5.9ft. We also get a bigger, stronger energy reading at 1571. It’s got some push, but it’s going to be ugly.
Friday the 21st is more of the same, with a cross-onshore wind and messy conditions. The swell is there, around 4.3ft to 5.9ft, but the quality just isn't there.
Saturday the 22nd is a turnaround. An ESE cross-off wind cleans things up as the swell holds at 4.9ft. This will be a much better day, especially in the morning. A proper fun-size SW groundswell with clean faces. This is another one to circle on the calendar.
Sunday the 23rd starts off beautifully with a light ENE offshore and 4.9ft of swell. The morning session will be clean and glassy, maybe the best conditions of the whole run. The afternoon gets a bit mushier as the wind turns cross-shore, but the morning is a gem.
Next week starts with a bit of size and some strength. Monday the 24th has 6.9ft of SW groundswell with a long 18-second period, and a strong energy reading of 2640. There’s plenty of water moving. However, a fresh north cross-off wind will be blowing. It’s going to be a bit wild, good for experienced surfers but not the cleanest. This one is more for the crew who like it a bit heaving.
Tuesday the 25th the swell drops right out, and the north wind is still strong, leaving nothing but poor conditions. A day to give it a miss.
Wednesday the 26th is a complete washout. Onshore westerly wind at 19-22 mph with rain and 6.2ft of swell. This will be a full-blown onshore mess. The setup looks far more interesting for a kite surfer than a paddle surfer. Give it a break.
Thursday the 27th the wind eases, but it’s still cross-shore, leaving the 5.2-5.6ft of SW groundswell a bit lumpy. It’s surfable, but nothing to get too excited about.
Friday the 28th and Saturday the 29th bring the swell down to that smaller, cleaner range again with offshore winds. It’s the perfect way to finish the forecast period. A return to those fun, clean, small-wave conditions where you can just enjoy yourself.
So
Short Range ForecastMostly dry. Very mild (max 17°C on Sun afternoon, min 13°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 20°C on Tue morning, min 13°C on Tue night). Winds decreasing (strong winds from the N on Tue morning, calm by Wed morning). | |||||||||||||||||||
Fri 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | ||||||||||||||
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 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 19 | SW 18 | SW 17 | SW 16 | SW 15 | WSW 15 | WSW 17 | SW 16 | SW 16 | SW 16 |
Wave Graph | ||||||||||||||||||||
2166 | 1832 | 1392 | 1384 | 836 | 668 | 590 | 428 | 310 | 619 | 441 | 686 | 487 | 443 | 453 | 683 | 1900 | 1571 | 1493 | 964 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | off | off | cross-off | cross-off | off | off | off | cross-off | cross-off | cross-on | glassy | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 1:22AM1.00m | 1:29PM1.24m | 1:39AM1.08m | 1:39PM1.18m | 1:58AM1.12m | 1:49PM1.13m | 2:19AM1.13m | 1:59PM1.07m | 2:40AM1.10m | 2:07PM0.99m | 3:00AM1.03m | 2:07PM0.91m | 3:19AM0.92m | |||||||
Low Tide | 7:37PM0.11m | 7:13AM0.06m | 7:42PM0.07m | 7:34AM0.10m | 7:51PM0.03m | 7:53AM0.16m | 8:02PM0.01m | 8:12AM0.23m | 8:15PM0.01m | 8:30AM0.33m | 8:28PM0.06m | 8:43AM0.44m | 8:36PM0.13m | |||||||
— | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | 7:11 | — | — | 7:09 | — | — | |
6:08 | — | — | 6:09 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | — | 6:12 | — | — | 6:13 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 16 | 15 | 16 | 16 | 15 | 17 | 15 | 16 | 17 | 17 | 20 | 19 | 14 | 14 | 14 | 14 | 14 | 14 | 14 |
Feels °C | 11 | 11 | 11 | 12 | 11 | 11 | 11 | 10 | 12 | 13 | 12 | 10 | 15 | 9 | 12 | 11 | 12 | 11 | 10 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 16 | SW 14 | SW 18 | SW 17 | SW 16 | SW 15 | SW 15 | — | — | — | SW 16 |
2166 | 1832 | 1392 | 1384 | 836 | 668 | 590 | 428 | 286 | 619 | 346 | 686 | 487 | 443 | 453 | 631 | — | — | — | 964 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 16 | SW 22 | SW 19 | — | — | — | — | SW 19 | — | — | — | SW 6 |
— | — | — | — | — | — | — | — | 310 | 163 | 441 | — | — | — | — | 303 | — | — | — | 60 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | SW 23 | — | SSE 4 | — | — | — | — | — | — | — | — | — |
— | — | — | — | — | — | — | — | 86 | — | 1 | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | ESE 4 | — | ESE 3 | — | ESE 2 | ESE 4 | — | — | ENE 3 | NNE 4 | N 4 | NNE 3 | NNW 3 | WSW 15 | WSW 17 | SW 16 | SW 16 | SW 16 |
— | — | 13 | — | 3 | — | 1 | 11 | — | — | 2 | 16 | 7 | 4 | 3 | 683 | 1900 | 1571 | 1493 | 87 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 243 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 651 | 564 | 649 | 0 | 401 | 402 | 510 | 1045 | 491 |
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.











