Surf Forecasts:
Trespassers surf forecast from 23 Aug 2026:
- Best quality surf: Thursday 27 Aug, 6PM (local time) - 6ft (1.8m), 19s period, SW swell with cross-offshore winds.
- Most powerful swell: Thursday 27 Aug, 6PM (local time) - 6ft (1.8m), 19s period, SW swell with 2,244 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 3PM (local time) - 4.5ft (1.4m), 16s 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 3PM. The primary swell is predicted to be 1.4m and 16s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.8m 19s and forecast to arrive on Thursday (Aug 27) at 6PM. 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 3s period and expected on Monday (Aug 24) at 12PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Sun 23rd Aug) | 4.5ft (1.4m) 16s |
| Best Surf | 6PM (Thu 27th Aug) | 6ft (1.8m) 19s |
| Most Powerful | 6PM (Thu 27th Aug) | 6ft (1.8m) 19s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's have a look at what's on the menu for our local reef, Trespassers.
We've got a bit of a mixed bag coming up over the next couple of weeks. The first real standout is going to be a window of very clean, long-period groundswell, but it's a ways off. We’ll see some good sessions in between, but you'll have to be patient.
Starting off this Sunday morning, August 23rd, we've got some serious energy in the water. A solid SW groundswell is pushing in at 5ft with a very long 17-second period. The combined energy is pumping at 1433, which is strong. Water temps are sitting right around average for this time of year at 59°. The wind is a light NNE cross-off, so the waves will be clean. This is excellent surf, but at this size with that much power, it’s really for the experienced crew only. Sunday afternoon holds similar, with 5ft swell from the SW and a 16-second period, still clean with light cross-off winds.
Monday, August 24th, sees a drop in size. Morning brings 3ft SW swell, but the period drops to 14 seconds and we've got a moderate NE breeze. The energy drops right off to 312, so it's looking pretty weak. Not worth rushing out for.
Tuesday the 25th, the swell bumps back up to 6ft from the SSW with a 16-second period, and the energy spikes to 2159. But the wind swings around to a moderate SSW cross, and then cross-on, making it choppy. It’s a no-go for a good surf.
Wednesday the 26th through Friday the 28th is a bit of a waiting game. Swell sizes bob around from 3ft to 6ft, but the wind is mostly cross or light. The real highlight is Friday afternoon, August 28th. The swell is 5ft from the SW with a 16-second period, but the wind goes glassy, going from a NW 3 mph breeze. The waves will be absolutely perfect, clean faces. The energy is still solid at 1101. That afternoon session is the pick of the first week.
Saturday the 29th is okay in the morning with a clean 4ft swell and light cross-off breeze, but the afternoon gets messy. Sunday the 30th and Monday the 31st look like another good run. We get a consistent 4ft to 5ft SSW/SW swell, with very clean conditions due to light cross-off winds. Those mornings will be worth a paddle.
After that, things go quiet. We've got a stretch from Tuesday, September 1st through Friday, September 4th where the conditions look poor. The swell is small and the wind is up, creating chop. It's a solid gap with no real recommendations.
Now, hold onto your board, because the big news is Sunday, September 6th. We've got a powerful SW groundswell hitting 7ft with a 16-second period. The combined energy is a massive 3271. And get this – the wind is forecast to be glassy from the south at only 3 mph. This is excellent surf, but that’s 7ft of very long-period groundswell. It’s going to be heaving and powerful, only for the experts. The period is so long it will be best handled at this reef break. Sunday afternoon the wind turns onshore, so that morning window is your one and only shot.
Monday, September 7th, the swell is still big at 6ft to 6ft, but a strong SW wind kicks up, making it a complete mess. That’s a pass.
So, the absolute standouts are Friday afternoon, August 28th for a clean, mid-sized session, and Sunday morning, September 6th for a big, powerful, glassy groundswell for the experts only.
Rusty.
Short Range ForecastHeavy rain (total 23mm), heaviest during Mon morning. Very mild (max 16°C on Sun night, min 12°C on Sun night). Winds decreasing (fresh winds from the SSW on Mon night, calm by Tue night). | Days 4-6 Weather SummaryMostly dry. Very mild (max 18°C on Fri morning, min 12°C on Wed morning). Wind will be generally light. | ||||||||||||||||||||
Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | |||||||||||||||
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 17 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | SSW 16 | SW 14 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 |
Wave Graph | |||||||||||||||||||||
1433 | 1018 | 496 | 297 | 194 | 219 | 1356 | 1031 | 658 | 444 | 326 | 114 | 280 | 959 | 2101 | 1542 | 1101 | 685 | 507 | 342 | 234 | |
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-on | cross | cross-on | glassy | cross | cross | cross-off | cross | cross | cross-off | cross | glassy | cross-off | cross-off | cross-on | cross-off |
High Tide | 2:21PM0.02m | 2:29PM0.02m | 2:56AM0.01m | 2:43PM0.02m | 3:00AM0.01m | 3:00PM0.02m | 3:20AM0.01m | 3:14PM0.02m | 3:45AM0.01m | 3:26PM0.02m | 4:13AM0.01m | 3:34PM0.02m | |||||||||
Low Tide | 11:45PM0.00m | 11:01PM0.00m | 6:33AM0.00m | 10:36PM0.00m | 7:22AM0.00m | 10:26PM0.00m | 8:00AM0.00m | 10:24PM0.00m | 8:29AM0.00m | 10:29PM0.00m | 9:06AM0.01m | 10:35PM0.00m | |||||||||
6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | 6:48 | — | — | 6:48 | — | — | 6:46 | — | — | |
— | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | — | 5:59 | — | — | 5:59 | — | — | 6:00 | — | |
mm | — | — | 3 | 11 | 8 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 14 | 15 | 16 | 12 | 12 | 13 | 14 | 13 | 12 | 12 | 12 | 13 | 15 | 17 | 17 | 18 | 18 | 17 | 15 | 15 | 13 |
Feels °C | 11 | 13 | 13 | 8 | 8 | 11 | 9 | 8 | 9 | 10 | 9 | 10 | 11 | 15 | 14 | 16 | 17 | 15 | 13 | 12 | 10 |
Swell 1 Height (m) Direction Period (s) | SW 17 | SW 16 | SW 15 | SW 14 | SW 14 | SSW 13 | SW 16 | SSW 15 | SW 14 | SW 13 | SW 13 | SW 12 | SW 14 | SW 19 | SW 18 | SW 16 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 |
1433 | 1018 | 496 | 297 | 194 | 219 | 803 | 334 | 658 | 444 | 326 | 114 | 280 | 959 | 2101 | 1542 | 1101 | 685 | 507 | 342 | 234 | |
Swell 2 Height (m) Direction Period (s) | — | — | — | SW 20 | SW 19 | SW 18 | — | — | — | SSW 18 | SW 16 | SSW 15 | SW 21 | SW 14 | — | — | — | — | — | S 19 | SSW 20 |
— | — | — | 15 | 57 | 152 | — | — | — | 31 | 41 | 86 | 222 | 440 | — | — | — | — | — | 7 | 149 | |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | NNW 6 | E 4 | — | — | — | — | — | SW 24 | — | — | — | — | — | — | — | S 23 | SW 4 |
— | — | — | — | 3 | 3 | — | — | — | — | — | 22 | — | — | — | — | — | — | — | 10 | 5 | |
Wind waves Height (m) Direction Period (s) | — | — | — | NE 2 | NE 4 | — | SSW 16 | SW 14 | — | — | — | — | NNW 3 | N 4 | — | — | — | — | — | — | SE 3 |
— | — | — | 2 | 7 | — | 1356 | 1031 | — | — | — | — | 2 | 6 | — | — | — | — | — | — | 2 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 18 | 18 | 18 | 13 | 487 | 59 | 0 | 14 | 14 | 0 | 17 | 14 | 0 | 14 | 0 | 0 | 0 | 17 | 0 |
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.











