
Surf Forecasts:
Castles surf forecast from 18 Jul 2026:
- Best quality surf: Friday 24 Jul, 3AM (local time) - 5ft (1.6m), 14s period, SW swell with offshore winds.
- Most powerful swell: Thursday 23 Jul, 6AM (local time) - 6.5ft (2.0m), 14s period, SW swell with 1,537 kJ wave energy.
- Next surfable swell (1★+): Saturday 18 Jul, 6PM (local time) - 2.5ft (0.7m), 13s 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 (Jul 18) at 6PM. The primary swell is predicted to be 0.7m and 13s period with a secondary swell of 0.2m and 3s. 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 2.0m 14s and forecast to arrive on Thursday (Jul 23) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Sunday (Jul 19) at 9AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Sat 18th Jul) | 2.5ft (0.7m) 13s |
| Best Surf | 3AM (Fri 24th Jul) | 5ft (1.6m) 14s |
| Most Powerful | 6AM (Thu 23rd Jul) | 6.5ft (2.0m) 14s |
Table - best surf conditions forecast for Castles over the next 16 days.
The Lowdown
Right, grab a coffee, let’s have a look at the next couple of weeks.
We’re looking at a pretty quiet start around Castles, a solid reef break that works best on a WSW swell. The water temperature is sitting at a pretty standard 61°, nothing unusual there. For the Saturday morning, we’ve got a clean little 3ft SW swell with a period of 13 seconds, and a moderate cross-offshore breeze from the north – that’ll keep things tidy. The energy is weak (215), so it’s not going to be pumping, but it’s rideable. That’s really the only surf on offer for the opening weekend and into Monday. Sunday and Monday are marginal at best, with a drop in size and the same cross-off wind, so don’t expect much.
Tuesday the 22nd brings a pulse of swell, but it’s accompanied by a strong cross-onshore wind from the SSW at 15-18 mph, making conditions choppy and poor. Wednesday the 23rd sees the swell push up to 7ft from the SW, with a period of 14 seconds and moderate cross-shore wind – lumpy, but there’s some energy (1728). Still, not a recommended session.
Now, here’s where it gets interesting. On Friday the 24th, the wind swings offshore from the NE at 9 mph, and we get a 5ft SW swell with a 14-second period. The wave energy jumps up to 1006, and the conditions are forecast to be clean. That’s a standout morning for experienced surfers. The swell is on the bigger side for a reef break, but the offshore wind will really clean it up.
The next real highlight isn’t until the end of the month. For the Friday morning of July 31st, we’ve got an exceptional session on the cards. A 10ft SW swell with a 17-second period – that’s a very long-period groundswell – combined with a moderate offshore wind from the ENE at 12 mph. The combined swell energy is a massive 5064. This is expert territory only; that’s a serious swell. The long period will produce really well-shaped, powerful lines down the reef, but it will be heavy and the sets will be widely spaced. Not one for the faint-hearted.
Following that, the Saturday morning of August 1st still looks good, with a 7ft SSW swell, 15-second period, and light offshore wind. Energy is still strong (1943) and conditions should be clean for experienced surfers.
For the second week, the quality drops off. Sunday the 2nd and beyond see the wind turning cross-onshore again, and while there’s still plenty of swell energy around, the conditions become poor or marginal. It’s a case of getting on it while the winds are favourable in that last week of July.
Be aware, Castles can get busy, especially when the conditions clean up like that, so expect company on those good days.
Rusty.
Short Range ForecastMostly dry. Warm (max 20°C on Sun afternoon, min 13°C on Sat morning). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Wed afternoon. Very mild (max 18°C on Tue afternoon, min 10°C on Thu night). Winds increasing (calm on Tue night, fresh winds from the SSW by Wed afternoon). | ||||||||||||||||||||
Saturday 18 | Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | |||||||||||||||
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 13 | SW 13 | SW 13 | SW 19 | SW 18 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 13 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 |
Wave Graph | |||||||||||||||||||||
215 | 208 | 132 | 133 | 516 | 587 | 566 | 543 | 604 | 437 | 352 | 319 | 471 | 246 | 1163 | 1378 | 1270 | 1179 | 810 | 573 | 412 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-off | cross | on | on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | off | cross-off | off |
High Tide | 2:05PM1.17m | 2:13AM0.89m | 2:16PM1.10m | 2:41AM0.91m | 2:26PM1.04m | 3:13AM0.90m | 2:35PM0.96m | 3:48AM0.86m | 2:35PM0.87m | 4:33AM0.79m | 2:02PM0.79m | 11:56AM0.81m | |||||||||
Low Tide | 8:28PM0.21m | 7:58AM0.22m | 8:40PM0.17m | 8:22AM0.31m | 8:56PM0.16m | 8:45AM0.42m | 9:13PM0.18m | 9:06AM0.53m | 9:29PM0.23m | 9:12AM0.65m | 9:34PM0.31m | 8:49PM0.38m | |||||||||
7:35 | — | — | 7:35 | — | — | 7:35 | — | — | 7:33 | — | — | 7:33 | — | — | 7:33 | — | — | 7:33 | — | — | |
— | 5:52 | — | — | 5:52 | — | — | 5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:54 | — | — | 5:55 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — |
Temp °C | 16 | 19 | 18 | 17 | 20 | 19 | 17 | 19 | 18 | 17 | 18 | 17 | 14 | 14 | 14 | 13 | 13 | 12 | 12 | 13 | 12 |
Feels °C | 10 | 13 | 13 | 11 | 16 | 15 | 12 | 16 | 14 | 13 | 15 | 15 | 11 | 8 | 9 | 7 | 7 | 6 | 7 | 8 | 7 |
Swell 1 Height (m) Direction Period (s) | SW 13 | SW 13 | SW 13 | SW 12 | SW 18 | SW 16 | SW 15 | SW 15 | SW 14 | SW 13 | SW 13 | — | — | SW 13 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 13 |
215 | 208 | 132 | 71 | 516 | 587 | 566 | 543 | 604 | 437 | 352 | — | — | 246 | 1163 | 1378 | 1270 | 1179 | 810 | 573 | 412 | |
Swell 2 Height (m) Direction Period (s) | — | — | SW 21 | SW 19 | SW 13 | S 10 | S 10 | — | — | S 9 | — | — | — | — | — | — | — | — | — | — | — |
— | — | 18 | 133 | 104 | 8 | 2 | — | — | 2 | — | — | — | — | — | — | — | — | — | — | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | WSW 15 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
— | — | — | 21 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | N 3 | NNW 3 | NNE 2 | N 4 | NW 4 | — | NNW 3 | — | — | NNW 3 | — | SW 12 | SW 14 | SSW 6 | SSW 14 | — | — | — | ENE 2 | — | — |
3 | 2 | 1 | 12 | 3 | — | 7 | — | — | 2 | — | 319 | 471 | 103 | 81 | — | — | — | 1 | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 178 | 1 | 402 | 401 | 1 | 178 | 178 | 0 | 178 | 178 | 178 | 1217 | 1236 | 491 | 1 | 1 | 1 | 0 | 0 | 0 |
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.










