
Surf Forecasts:
Castles surf forecast from 12 Aug 2026:
- Best quality surf: Friday 14 Aug, 3AM (local time) - 7ft (2.1m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 12 Aug, 6PM (local time) - 10ft (3.0m), 16s period, SW swell with 4,389 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 3AM (local time) - 7ft (2.1m), 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 Friday (Aug 14) at 3AM. The primary swell is predicted to be 2.1m and 16s 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 3.0m 16s and forecast to arrive on Wednesday (Aug 12) at 6PM. Winds are predicted to be 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+) | 3AM (Fri 14th Aug) | 7ft (2.1m) 16s |
| Best Surf | 3AM (Fri 14th Aug) | 7ft (2.1m) 16s |
| Most Powerful | 6PM (Wed 12th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s chew the fat about what’s on the way for the next few weeks. We’ve got a solid run of south-west groundswell coming through, but there’s a bit of rubbish wind to sit through before we get the clean stuff.
The first couple of days are a total bust with strong onshore winds. Don’t even bother paddling out Wednesday or Thursday of this week. The real action starts to shape up from Friday, and there’s a killer window that’ll have the regulars buzzing.
Castles is a consistent reef break that’s wide open to that south-west swell direction. The water’s sitting at 59°F, which is about average for this time of year, so no major surprises there.
Let’s run through it. Friday the 14th is where we get our first proper look. The swell’s still solid, around 7 ft to 7 ft from the SW with a long 16-second period. That’s proper groundswell energy, with moderate wave energy (values between 2017 and 2220). The wind goes light and clean, cross-offshore from the ESE to SE. Conditions will be tidy, but this one’s for the experienced crew – that size and power on a reef at over 6 ft is no joke for beginners or intermediates.
Saturday the 15th drops down a touch, with 5 ft to 6 ft SW swell, still with that long 16-second period. Wave energy is still moderate (1155 to 1392). The wind is a moderate cross-off, keeping it clean. It’s good, but it’s not the standout.
The standout is Sunday the 16th and Monday the 17th. Sunday morning sees the swell dropping to 4 ft from the SW, but now we’re talking offshore wind from the east (12 mph). That’s glassy, clean, and perfect. The period is still a solid 14 seconds. Moderate energy (668). This is the kind of morning you set the alarm for. Monday the 17th keeps that magic going: 4 ft SW swell, 16-second period, and light offshore easterly breeze all day. Clean, gentle, and fun. Wave energy is still moderate (762 to 784). This is the best small-wave window on offer. Perfect for a longboard or a fish.
Tuesday the 18th is a write-off with strong northerly winds and dropping swell. Wednesday the 19th is tiny and weak.
Then we’ve got a gap before things get interesting again. Friday the 21st sees a bump back up to 6 ft to 6 ft SW swell, but the wind is cross-shore, so it won’t be as clean as the Sunday/Monday run. Saturday the 22nd is messy with strong onshore wind.
Sunday the 23rd has a weird one. Morning is small and onshore, but the afternoon throws up a 10 ft W swell with a very long 17-second period and light onshore wind. Wave energy is very strong (5491). That’s a massive, powerful swell for the reef. The wind is onshore, so it won’t be pristine, but for a big-wave charger, that’s a session worth watching. This one’s for experts only – over 8 ft is big water.
Monday the 24th and Tuesday the 25th stay big, around 7 ft to 8 ft, but the wind is messy and onshore or cross-shore. Not great.
Then, another promising window pops up on Wednesday the 26th. Morning session shows 6 ft SW swell with a 14-second period and light offshore wind from the east. Clean conditions and moderate energy (1700). That’s another excellent window for experienced surfers.
After that, the swell fades and the wind picks up again to close out the period.
So, if you’re looking to get wet, Sunday the 16th and Monday the 17th are your absolute best bets for clean, fun, manageable waves with offshore wind. The Wednesday the 26th morning is also a solid shout for a clean, bigger wave session.
Stay frothy, and I’ll see you out the back.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Wed morning, min 14°C on Wed morning). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Very mild (max 17°C on Sat afternoon, min 11°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | |||||||||||||||
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 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 18 | SW 17 | SW 16 |
Wave Graph | |||||||||||||||||||||
3791 | 4941 | 2538 | 2516 | 2075 | 1932 | 2220 | 2017 | 1832 | 1392 | 1155 | 847 | 668 | 581 | 440 | 643 | 603 | 410 | 595 | 413 | 314 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off | cross-off | cross-off | off | off | off | cross-off | cross | on |
High Tide | 12:48PM1.38m | 00:57AM0.80m | 1:06PM1.36m | 1:08AM0.91m | 1:19PM1.30m | 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 | |||||||
Low Tide | 7:30PM0.12m | 6:29AM0.08m | 7:34PM0.13m | 6:52AM0.05m | 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 | ||||||||
7:18 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:13 | — | — | 7:13 | — | — | 7:11 | — | — | |
— | 6:07 | — | — | 6:08 | — | — | 6:08 | — | — | 6:09 | — | — | 6:09 | — | — | 6:10 | — | — | 6:12 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 15 | 14 | 15 | 14 | 15 | 15 | 15 | 15 | 15 | 17 | 16 | 15 | 15 | 14 | 15 | 17 | 17 | 19 | 21 | 18 |
Feels °C | 10 | 10 | 11 | 13 | 11 | 13 | 12 | 11 | 10 | 10 | 12 | 12 | 10 | 9 | 9 | 11 | 13 | 12 | 11 | 14 | 14 |
Swell 1 Height (m) Direction Period (s) | — | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 | SW 14 | SW 14 | SW 16 | SW 16 | SW 15 | SW 18 | SW 17 | SW 16 |
— | 4941 | 2538 | 2516 | 2075 | 1932 | 2220 | 2017 | 1832 | 1392 | 1155 | 847 | 668 | 581 | 440 | 643 | 603 | 410 | 595 | 413 | 314 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 23 | SW 21 | SW 20 | S 10 | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 86 | 159 | 306 | 2 | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SSW 24 | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 55 | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | SW 17 | SW 16 | SW 16 | — | SW 16 | — | — | — | — | E 4 | E 4 | — | — | — | SE 4 | ENE 3 | SSE 5 | — | N 4 | NNW 4 | NNW 3 |
3791 | 3272 | 65 | — | 61 | — | — | — | — | 9 | 7 | — | — | — | 14 | 2 | 2 | — | 17 | 17 | 4 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1236 | 1229 | 651 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 361 | 1 | 0 | 0 | 0 | 651 | 564 | 287 |
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.











