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Castles Surf Forecast
/ SA – Nullarbor (9 breaks) / South Australia (91 breaks) /
Surf Forecasts:
Castles surfForecast / SA – Nullarbor / Australia
16 Day Weather and Surf, issued 8 pm Saturday 18 Apr 2026 ACSTForecast update in hr min s Forecast update imminent
Castles surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Castles sea temperature is
19.9° C
(Which is slightly warmer than usual)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 Monday (Apr 20) at 9AM. The primary swell is predicted to be 0.6m and 15s period with a secondary swell of 0.8m and 11s. 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 1.6m 14s and forecast to arrive on Thursday (Apr 23) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Friday (Apr 24) at 6AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 20th Apr) | 2ft (0.6m) 15s |
| Best Surf | 3AM (Sat 25th Apr) | 2.5ft (0.7m) 18s |
| Most Powerful | 12AM (Thu 23rd Apr) | 5ft (1.6m) 14s |
Table - best surf conditions forecast for Castles over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Mostly dry. Warm (max 32°C on Tue afternoon, min 15°C on Sun night). Winds increasing (calm on Sat night, fresh winds from the NNW by Tue morning). | Days 3-6 Weather Summary Mostly dry. Warm (max 31°C on Thu afternoon, min 17°C on Tue night). Winds increasing (light winds from the NW on Tue night, strong winds from the N by Fri morning). | |||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Sat 25 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 12 | 18 | 18 | 11 | 15 | 14 | 14 | 13 | 14 | 16 | 16 | 14 | 14 | 13 | 13 | 13 | 13 | 13 | 19 | 17 | 16 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 132 | 49 | 79 | 283 | 174 | 206 | 410 | 295 | 265 | 574 | 468 | 787 | 917 | 704 | 562 | 269 | 193 | 444 | 260 | 350 | 701 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross- on | cross- off | cross- off | cross- off | off | cross- off | cross | cross- on | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off | on | cross- off | cross- off | cross | |
High Tide / height (m) | 12:54AM 0.93 | 1:13PM 1.48 | 1:01AM 0.84 | 1:33PM 1.43 | 1:00AM 0.78 | 1:50PM 1.34 | 12:52AM 0.76 | 2:04PM 1.21 | 12:40AM 0.78 | 2:12PM 1.07 | 12:24AM 0.80 | 2:09PM 0.93 | 12:02AM 0.81 | 1:40PM 0.82 | ||||||||
Low Tide / height (m) | 6:36AM -0.04 | 7:43PM 0.12 | 6:44AM -0.05 | 8:01PM 0.25 | 6:52AM -0.05 | 8:11PM 0.39 | 6:59AM -0.03 | 8:12PM 0.51 | 7:05AM 0.03 | 8:00PM 0.58 | 7:04AM 0.11 | 7:29PM 0.62 | 6:50AM 0.21 | |||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Sat 25 | ||||||||||||||||
| Sunrise | - | 7:01 | - | - | 7:01 | - | - | 7:01 | - | - | 7:03 | - | - | 7:03 | - | - | 7:03 | - | - | 7:05 | - | |
| Sunset | - | - | 6:13 | - | - | 6:12 | - | - | 6:09 | - | - | 6:08 | - | - | 6:07 | - | - | 6:07 | - | - | 6:06 | |
 |  | |  |  | | | | | | | | | | | | | | |  | | ||
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Temp. °C | 28 | 18 | 17 | 16 | 18 | 21 | 24 | 30 | 32 | 28 | 18 | 20 | 25 | 29 | 31 | 29 | 30 | 29 | 20 | 22 | 22 | |
| Feels °C (?) | 27 | 16 | 14 | 14 | 17 | 20 | 20 | 22 | 25 | 26 | 15 | 17 | 20 | 20 | 23 | 22 | 22 | 24 | 20 | 19 | 19 | |
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
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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