Surf Forecasts:
Castles surf forecast from 9 Aug 2026:
- Best quality surf: Friday 14 Aug, 3AM (local time) - 6ft (1.9m), 15s period, SW swell with glassy winds.
- Most powerful swell: Wednesday 12 Aug, 12PM (local time) - 10ft (3.0m), 17s period, SW swell with 5,392 kJ wave energy.
- Next surfable swell (1★+): Friday 14 Aug, 3AM (local time) - 6ft (1.9m), 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 Friday (Aug 14) at 3AM. The primary swell is predicted to be 1.9m and 15s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Castles in the next 16 days are 3.0m 17s and forecast to arrive on Wednesday (Aug 12) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Aug 11) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Fri 14th Aug) | 6ft (1.9m) 15s |
| Best Surf | 3AM (Fri 14th Aug) | 6ft (1.9m) 15s |
| Most Powerful | 12PM (Wed 12th Aug) | 10ft (3.0m) 17s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Alright, Rusty here. Let's see what we've got for Castles.
We're looking at the one spot: Castles. It's a reef break, exposed and consistent, but the first week is a write-off. Strong to very strong wave energy (values like 3773 and 3882) is on the way, but it's coming in with nasty onshore winds from the SW, making for poor surf with near gale strength winds of 31 mph on the 9th. That's messy, dangerous even for experienced surfers. Water temp is 60°, pretty much normal for the time of year. There’s a long stretch of nothing good here until the tide and wind line up.
The real standout isn't until Friday, August 14th on the morning session. That's when we finally catch a break. The swell eases to 6 ft coming from the WSW, but the period is a solid 16 seconds – that's proper groundswell. The game-changer is a light 3 mph offshore wind from the NE. This combo clean up the wave faces and makes Castles look like a gem for experienced surfers. The energy is still moderate to strong (1878), so there's push, but the offshore wind keeps it glassy. Best on offer by a long shot.
The Saturday morning, August 15th is another solid pick. Slightly smaller at 6 ft from the SW, but still with a long 16-second period and a gentle 9 mph offshore breeze from the E. Clean conditions again, though the energy drops a touch (1374). Still, for a weekend session, this is quality.
Going further out, Sunday, August 23rd morning shows some potential. A 6 ft SW swell with a nice 17-second period and a light ESE wind keeping things clean. Energy kicks back up to 1691. It's promising but remember, that's over a week away, so don't book your flights just yet.
In short: Skip the first week. The only windows worth paddling out for are the mornings of August 14th and 15th, with a long-range look at the 23rd. When that offshore wind hits, Castles will be a rippable reef.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun morning. Very mild (max 17°C on Tue morning, min 11°C on Mon night). Winds decreasing (gales from the WSW on Sun night, light winds from the WNW by Mon afternoon). | Days 4-6 Weather SummaryMostly dry. Very mild (max 16°C on Thu morning, min 14°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | WSW 16 | SW 11 | SW 12 | SW 17 | SW 16 | SW 16 | SW 14 | WSW 18 | SW 17 | SW 17 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 3773 | 2014 | 2623 | 3882 | 2645 | 1513 | 746 | 2265 | 4491 | 3586 | 3123 | 2203 | 1753 | 1684 | 1568 | 1878 | 1878 | 1654 | 1374 | 1125 | 825 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | on | cross-on | cross | cross | on | on | on | on | cross-on | cross-on | on | cross | off | cross | cross-off | off | cross-off | cross-off |
High Tide | 11:38AM1.14m | 1:00AM0.58m | 12:03PM1.28m | 00:48AM0.63m | 12:27PM1.36m | 00:49AM0.71m | 12:48PM1.38m | 00:57AM0.80m | 1:06PM1.36m | 1:08AM0.91m | 1:19PM1.30m | 1:22AM1.00m | 1:29PM1.24m | 1:39AM1.08m | |||||||
Low Tide | 7:12PM0.14m | 5:06AM0.41m | 7:16PM0.11m | 5:37AM0.27m | 7:23PM0.11m | 6:04AM0.16m | 7:30PM0.12m | 6:29AM0.08m | 7:34PM0.13m | 6:52AM0.05m | 7:37PM0.11m | 7:13AM0.06m | 7:42PM0.07m | ||||||||
 |  |  |  | |  | |  |  | |  | | | |  | | | | | | | |
 | 7:20 | — | — | 7:20 | — | — | 7:18 | — | — | 7:18 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — |
 | — | 6:06 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:08 | — | — | 6:08 | — | — | 6:09 | — |
mm | 12 | — | 3 | — | — | — | — | 3 | 4 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 13 | 13 | 13 | 14 | 14 | 17 | 16 | 13 | 14 | 15 | 15 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 15 | 15 |
Feels °C | 2 | 2 | 1 | 8 | 9 | 9 | 8 | 8 | 4 | 8 | 10 | 12 | 13 | 11 | 13 | 12 | 12 | 12 | 10 | 11 | 10 |
Swell 1 Height (m) Direction Period (s) | — | — | — | — | SW 16 | SW 16 | SW 14 | SW 18 | — | — | — | SW 16 | SW 15 | SW 15 | SW 15 | SW 16 | SW 16 | SW 16 | SW 16 | SW 15 | SW 14 |
| kJ | — | — | — | — | 2645 | 1513 | 746 | 1798 | — | — | — | 2203 | 1753 | 1684 | 1568 | 1878 | 1878 | 1654 | 1374 | 1125 | 825 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | WSW 16 | SW 11 | SW 12 | SW 17 | SW 16 | NNW 3 | NW 5 | WSW 18 | SW 17 | SW 17 | SW 17 | SW 16 | — | SW 15 | — | — | — | — | — | — | — |
| kJ | 3773 | 2014 | 2623 | 3882 | 68 | 4 | 73 | 2265 | 4491 | 3586 | 3123 | 64 | — | 57 | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 402 | 501 | 1052 | 1166 | 1560 | 510 | 1111 | 1227 | 1344 | 1219 | 1220 | 648 | 1 | 648 | 1 | 0 | 1 | 0 | 0 | 0 | 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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