Surf Forecasts:
Trespassers surf forecast from 20 Aug 2026:
- Best quality surf: Sunday 23 Aug, 12AM (local time) - 5ft (1.5m), 15s period, SW swell with glassy winds.
- Most powerful swell: Thursday 27 Aug, 9PM (local time) - 6ft (1.9m), 18s period, SW swell with 2,078 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 12AM (local time) - 5ft (1.5m), 15s period with SW swell.
Best Forecast Surf Conditions for Trespassers this week:
The surf forecast for Trespassers over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 23) at 12AM. The primary swell is predicted to be 1.5m and 15s period with a secondary swell of 0.8m and 19s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.9m 18s and forecast to arrive on Thursday (Aug 27) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Friday (Aug 28) at 12AM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 23rd Aug) | 5ft (1.5m) 15s |
| Best Surf | 12AM (Sun 23rd Aug) | 5ft (1.5m) 15s |
| Most Powerful | 9PM (Thu 27th Aug) | 6ft (1.9m) 18s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at the next couple of weeks for Trespassers. We've got a bit of a mixed bag coming in, with some real gems if you can time it right, but plenty of rough patches to dodge too.
First up, the water temp is sitting at a fairly average 58°F for this time of year, so nothing too wild there. The main story is a run of solid SW swell energy that’s going to pulse through, but the wind is going to be the key. That first Friday and Saturday, the 21st and 22nd of August, are pretty much write-offs. We’ve got onshore winds and a lot of bumpy energy—the combined swell energy is up around 1440 to 1640, so there’s plenty of power in the water, but it’s messy, choppy, and not worth paddling out for. Leave the board on the beach.
The standout window, no question about it, starts on Sunday the 23rd of August. Sunday morning is looking prime: the wind swings light NNE, going cross-offshore, and we’ve got a clean 5ft of SW groundswell with a very long 17-second period. The combined energy is still strong at 1433, but with that wind, the waves will have proper shape and power. This is serious reef-break territory at Trespassers, so take your A-game. It’s a fairly consistent spot, but it’s an advanced wave, and crowds are possible. This is your best shot in the whole forecast—clean, well-shaped, and punchy.
The quality holds into Sunday afternoon, though the swell drops a touch to 5ft with a 16-second period, still clean and inviting. Monday the 24th will have smaller, cleaner waves in the 3ft to 3ft range, fun for a grovel but nothing to write home about, especially with the swell energy dropping to around 300.
Then we hit a really nasty patch. Tuesday the 25th through to Sunday the 30th of August is mostly dominated by fresh, strong onshore and cross-shore winds that are going to trash the surface. The swell energy on Tuesday afternoon is even peaking at 1536, but it’s accompanied by 19 mph SW winds creating lumpy, blown-out conditions. It’s a classic case of plenty of power, but no one’s having fun.
There is a flicker of hope late on Thursday the 27th of August. The afternoon shows a clean, cross-offshore NNE breeze with a big 5ft, 19-second groundswell hitting the reef. That’s a very long period, and the combined energy is massive at 2054. The catch is the forecast is marginal, and you’d be battling the crowds if anyone else is watching the charts. It’s a long-range call, so less certain, but if it comes together, it could be epic.
After that, the forecast goes pretty bleak again. Strong winds, rain, and poor conditions dominate from the 28th right through the first week of September. There’s a small, clean window on the morning of the 31st of August with 4ft SSW swell and light cross-offshore winds, but the energy is moderate at 731, and it’s a far cry from that Sunday stand-out. The rest is a long stretch of onshores, lumpy cross-chop, and very marginal surf quality. There’s nothing else I’d recommend for a paddle out.
To sum it up: your one true standout is Sunday the 23rd of August. If you can’t make that, keep an eye on Thursday the 27th afternoon for a potential clean, long-period bomb, but that one’s more of a long-shot bet.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Sun night, min 12°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 4mm), mostly falling on Mon night. Very mild (max 16°C on Mon morning, min 10°C on Wed night). Winds increasing (calm on Mon afternoon, fresh winds from the SW by Tue afternoon). | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
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 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SSW 14 | SW 17 | SW 16 | SSW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 17 |
Wave Graph | |||||||||||||||||||||
992 | 1643 | 1532 | 1306 | 1140 | 940 | 1433 | 1018 | 496 | 297 | 236 | 305 | 1018 | 1087 | 658 | 400 | 326 | 144 | 297 | 1904 | 1757 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | on | glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-on | cross-off | cross-on | cross-off | cross-off | cross-off | cross |
High Tide | 2:19PM0.02m | 2:13PM0.02m | 2:21PM0.02m | 2:29PM0.02m | 2:56AM0.01m | 2:43PM0.02m | 3:00AM0.01m | 3:00PM0.02m | 3:20AM0.01m | 3:14PM0.02m | |||||||||||
Low Tide | 00:16AM0.00m | 00:18AM0.00m | 11:45PM0.00m | 11:01PM0.00m | 6:33AM0.00m | 10:36PM0.00m | 7:22AM0.00m | 10:26PM0.00m | 8:00AM0.00m | 10:24PM0.00m | |||||||||||
6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | |
— | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 3 | — | — | — | — | — | — | — | — | 1 |
Temp °C | 13 | 14 | 14 | 14 | 13 | 13 | 14 | 14 | 15 | 16 | 16 | 13 | 14 | 14 | 13 | 13 | 13 | 12 | 13 | 15 | 15 |
Feels °C | 10 | 10 | 10 | 12 | 11 | 12 | 12 | 12 | 12 | 13 | 13 | 9 | 9 | 8 | 8 | 10 | 11 | 10 | 7 | 11 | 9 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 13 | SW 16 | SSW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 17 |
992 | 1643 | 1532 | 1306 | 1140 | 940 | 1433 | 1018 | 496 | 297 | 236 | 219 | 1018 | 449 | 658 | 400 | 326 | 144 | 297 | 1904 | 1757 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | — | — | SSW 24 | SSW 21 | SSW 19 | — | — | — | SW 20 | SW 19 | SW 17 | — | — | — | SW 18 | SSW 16 | SW 15 | SSW 21 | SW 14 | — |
455 | — | — | 54 | 302 | 465 | — | — | — | 15 | 57 | 305 | — | — | — | 49 | 102 | 109 | 294 | 147 | — | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 24 | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 22 | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | W 5 | — | — | — | — | — | — | — | ENE 3 | E 3 | SE 4 | SSW 15 | SE 4 | — | — | — | NNE 3 | N 3 | NE 4 |
— | — | 11 | — | — | — | — | — | — | — | 1 | 5 | 5 | 1087 | 4 | — | — | — | 3 | 3 | 8 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 159 | 14 | 13 | 13 | 0 | 0 | 0 | 0 | 0 | 0 | 13 | 435 | 595 | 13 | 0 | 67 | 0 | 100 | 100 | 161 |
Best forecast wave conditions in Yorke Peninsula | |||||||||||||||||||||
Best forecast wave conditions in Australia | |||||||||||||||||||||
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Information about the Trespassers Surf forecast
The above surf forecast table for Trespassers provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Trespassers can be found by selecting the local surf guide option on the grey menu. Our Trespassers 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 (Trespassers) 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 Trespassers 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 Yorke Peninsula? If you are looking for accommodation near Trespassers, camping, hotels and holiday cottages in Yorke Peninsula, consider staying in Kingscote which is 86 km (53 miles) away.











