Surf Forecasts:
Castles surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 19 Aug, 9PM (local time) - 5ft (1.5m), 15s period, SW swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6AM (local time) - 6ft (1.8m), 16s period, SW swell with 1,697 kJ wave energy.
- Next surfable swell (1★+): Wednesday 19 Aug, 9PM (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 Wednesday (Aug 19) at 9PM. The primary swell is predicted to be 1.5m and 15s period with a secondary swell of 0.8m and 18s. 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 1.8m 16s and forecast to arrive on Tuesday (Aug 25) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Sunday (Aug 23) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Wed 19th Aug) | 5ft (1.5m) 15s |
| Best Surf | 9PM (Wed 19th Aug) | 5ft (1.5m) 15s |
| Most Powerful | 6AM (Tue 25th Aug) | 6ft (1.8m) 16s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright folks, Rusty here, let's talk about what's coming up for this stretch of coast.
We're looking at a solid run of southwest groundswell for the next couple of weeks. The water is sitting at 59°F, which is about average for this time of year, so nothing out of the ordinary here. The main break in the game is Castles, a consistent reef break that handles the best of this swell direction.
The first real standout is shaping up for Thursday morning, the 20th of August. The swell is a clean 3ft of long-period SW groundswell (16 seconds), and the wind is going glassy. That's a recipe for clean, peeling waves, and it's a perfect beginner-friendly size. The wave energy is moderate at 515, but the conditions are top-notch.
If you've got a bit more experience, the pick of the run is Saturday, the 22nd of August. The morning session is where it's at. We're looking at a 5ft SW groundswell with a 15-second period, and that's a decent amount of juice (1286 combined energy). The wind is clean offshore out of the ENE, so the waves will be well-shaped and have proper energy. This is expert-level size, so it's not for the faint of heart. The offshore wind makes it a real gem.
Sunday, the 23rd of August, holds a special mention for the afternoon. The swell drops to a more manageable 4ft, and the wind drops completely to glassy. That's a beautiful, clean session for anyone comfortable in that range.
The first week is definitely the main event. The second week, from around the 25th onwards, sees a drop in consistency. The swell sticks around, often with a bit more size, but the wind is messier. While there's good energy on the 28th (a 7ft SW swell with 1761 energy), the wind is a strong offshore, which can make it hard to get into the waves. The quality drops off into the end of the run, with small, choppy surf and poor conditions.
So, to sum it up: the best windows are Thursday morning the 20th for clean, small waves, and Saturday morning the 22nd for the best quality, more powerful surf. Get on it.
Rusty.
Short Range ForecastMostly dry. Very mild (max 16°C on Thu morning, min 12°C on Fri morning). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon morning. Warm (max 20°C on Sun afternoon, min 13°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 966 | 685 | 416 | 574 | 1216 | 949 | 1364 | 1281 | 1200 | 924 | 746 | 1282 | 897 | 557 | 393 | 565 | 1364 | 1568 | 1155 | 778 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | off | glassy | cross-on | cross-on | cross-on | cross-on | cross-off | off | cross-off | off | cross-off | glassy | glassy | cross | cross | cross-on | cross | cross-on | cross-off |
High Tide | 3:00AM1.03m | 2:07PM0.91m | 3:19AM0.92m | 1:48PM0.84m | 3:31AM0.80m | 12:48PM0.83m | 2:55AM0.66m | 11:50AM0.92m | 1:02AM0.62m | 11:40AM1.06m | 00:18AM0.68m | 11:50AM1.19m | 00:13AM0.78m | |||||||
Low Tide | 8:28PM0.06m | 8:43AM0.44m | 8:36PM0.13m | 8:44AM0.56m | 8:33PM0.21m | 7:56AM0.66m | 8:02PM0.28m | 5:37AM0.64m | 7:09PM0.28m | 5:03AM0.50m | 6:40PM0.23m | 5:15AM0.35m | 6:35PM0.15m | |||||||
 |  |  | |  | |  | | | | | | |  |  | |  | | | | |
 | — | — | 7:09 | — | — | 7:09 | — | — | 7:07 | — | — | 7:05 | — | — | 7:05 | — | — | 7:03 | — | — |
 | 6:12 | — | — | 6:13 | — | — | 6:14 | — | — | 6:14 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | 1 | — | — | — |
Temp °C | 15 | 15 | 16 | 16 | 14 | 13 | 13 | 14 | 15 | 16 | 14 | 19 | 20 | 18 | 16 | 16 | 14 | 14 | 14 | 13 |
Feels °C | 11 | 13 | 13 | 13 | 12 | 10 | 9 | 11 | 12 | 12 | 10 | 15 | 18 | 16 | 15 | 12 | 10 | 9 | 9 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 16 | SW 16 | SW 15 | SW 15 | SW 14 | SW 17 | SW 16 | SW 15 | SW 14 | — | — | — | — | SW 13 |
| kJ | 966 | 685 | 416 | 574 | 1216 | 949 | 1364 | 1281 | 1200 | 924 | 746 | 1282 | 897 | 557 | 393 | — | — | — | — | 778 |
Swell 2 Height (m) Direction Period (s) | SW 20 | SW 18 | SW 9 | SW 8 | SW 19 | SW 18 | — | — | SW 23 | SW 21 | SW 19 | — | — | SW 21 | SW 20 | — | — | — | — | — |
| kJ | 99 | 201 | 99 | 58 | 303 | 375 | — | — | 86 | 162 | 369 | — | — | 18 | 60 | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | SW 15 | — | — | SW 16 | SW 15 | SW 17 | SW 16 | — | — | — | ESE 4 | NE 3 | — | — | — | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 |
| kJ | 77 | — | — | 66 | 60 | 75 | 95 | — | — | — | 9 | 2 | — | — | — | 565 | 1364 | 1568 | 1155 | 64 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 1227 | 0 | 0 | 633 | 1 | 552 | 633 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 491 | 491 | 491 | 552 | 0 |
Best forecast wave conditions in Nullarbor | ||||||||||||||||||||
Best forecast wave conditions in Australia | ||||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Castles surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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