Surf Forecasts:
Trespassers surf forecast from 20 Aug 2026:
- Best quality surf: Sunday 23 Aug, 12AM (local time) - 4.5ft (1.4m), 15s period, SW swell with offshore winds.
- Most powerful swell: Thursday 27 Aug, 6PM (local time) - 6ft (1.9m), 19s period, SW swell with 2,372 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 12AM (local time) - 4.5ft (1.4m), 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 1.4m and 15s period with a secondary swell of 0.8m and 19s. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Trespassers in the next 16 days are 1.9m 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 1.0m 4s period and expected on Thursday (Aug 27) at 3PM.
| Wave Type | Time (ACST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 23rd Aug) | 4.5ft (1.4m) 15s |
| Best Surf | 12AM (Sun 23rd Aug) | 4.5ft (1.4m) 15s |
| Most Powerful | 6PM (Thu 27th Aug) | 6ft (1.9m) 19s |
Table - best surf conditions forecast for Trespassers over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on the table for the next couple of weeks at Trespassers. This is a reef break for the advanced crew, fairly consistent, and it gets pretty exposed to the south-west swell. The water temp is sitting at about 58°, which is pretty much spot on average for this time of year, so no weirdness there.
Right off the bat, it’s a bit of a slow start. Thursday afternoon is a write-off – onshore wind and rain, with a big 5ft swell (combined energy of 1559) but it’s all blown out. You’d be a fool to paddle out. Friday and Saturday look marginal at best with onshore and cross-onshore winds, even though the swell hangs around the 5ft to 6ft mark. The energy is still strong (1447 to 1643), but the wind just kills it. Not worth getting wet for.
Now, Sunday the 23rd of August is where it gets interesting. That’s your standout morning. The wind swings to a light cross-offshore breeze from the NNE, and you’ve got a clean 5ft groundswell pumping in from the SW with a 17-second period (combined energy 1433). That’s a long-period groundswell – it’ll have real shape and power, and the clean conditions will make it an excellent session for experienced surfers. The break might get a bit of a crowd, so be ready to share, but it’s the best call of the whole run.
After that, the week eases off. Monday morning is still rideable with a dropping 3ft swell, but Tuesday and Wednesday get messy again with strong cross-shore winds, despite the swell hanging around 5ft to 6ft. Not ideal.
Thursday the 27th of August has a weird one – a tiny 3ft swell with a 21-second period (combined energy 878). That’s a super long-period swell, which at a reef can mean some real nice, lined-up waves, but the crosswind will mess with it. Friday holds around 5ft to 5ft but the wind is mostly on it.
Then we get another little window. Saturday the 29th of August morning sees a fresh offshore ESE breeze of 30 km/h with a 6ft WSW swell (period 10 seconds). That’s going to be clean and punchy. It’s a bit solid at 6ft, so it’s for the experienced lot, but it’ll be good. The afternoon is even better with a moderate offshore and a 6ft SW swell (combined energy 1131). That’s a strong call for a fun, clean session.
Sunday the 30th keeps the clean theme with a lighter cross-offshore breeze and 5ft to 6ft swells. Not as powerful, but very rideable. Monday the 31st drops right off, and Tuesday the 1st of September brings back a bigger 7ft swell (period 10 seconds) but with cross-shore winds – marginal.
Looking into the second week, Wednesday the 2nd of September has some promise with a clean cross-offshore wind and 6ft SW swell (period 14 seconds, combined energy 1409). That’s a solid, clean wave for the advanced guys. But by Thursday and Friday, the wind gets nasty again – strong breezes and onshore flow ruin a 5ft to 7ft swell. Not your friend.
All in all, the clear winner is Sunday morning the 23rd of August. Clean, powerful, long-period groundswell. Saturday the 29th is your backup. The rest is a mix of wind-affected and marginal conditions. Keep your eye on the long-range, because it’s promising but not locked in.
Rusty.
Short Range ForecastSome drizzle, heaviest during Thu afternoon. Very mild (max 14°C on Thu afternoon, min 12°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Tue morning. Very mild (max 15°C on Mon morning, min 11°C on Tue morning). Wind will be generally light. | |||||||||||||||||||
Thu 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | ||||||||||||||
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 16 | SW 16 | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 17 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 |
Wave Graph | ||||||||||||||||||||
1317 | 1366 | 992 | 1643 | 1532 | 1306 | 1140 | 869 | 1433 | 1018 | 496 | 297 | 236 | 522 | 1018 | 1341 | 890 | 501 | 418 | 181 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | on | on | cross-on | on | off | cross-off | cross | cross-off | cross-off | cross-on | cross-on | cross | cross | cross | glassy | cross-on | cross-off |
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 | |||||||||||
Low Tide | 00:04AM0.00m | 00:16AM0.00m | 00:18AM0.00m | 11:45PM0.00m | 11:01PM0.00m | 6:33AM0.00m | 10:36PM0.00m | 7:22AM0.00m | 10:26PM0.00m | |||||||||||
— | — | 6:56 | — | — | 6:54 | — | — | 6:54 | — | — | 6:52 | — | — | 6:52 | — | — | 6:50 | — | — | |
5:52 | — | — | 5:53 | — | — | 5:54 | — | — | 5:55 | — | — | 5:55 | — | — | 5:57 | — | — | 5:58 | — | |
mm | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | 4 | — | — | — | — | — |
Temp °C | 14 | 14 | 13 | 14 | 14 | 14 | 13 | 13 | 14 | 14 | 14 | 15 | 14 | 14 | 13 | 14 | 12 | 11 | 11 | 12 |
Feels °C | 8 | 10 | 9 | 10 | 10 | 12 | 10 | 12 | 12 | 12 | 12 | 12 | 11 | 12 | 7 | 8 | 7 | 10 | 8 | 8 |
Swell 1 Height (m) Direction Period (s) | SW 15 | SW 16 | SW 14 | SW 17 | SW 16 | SW 15 | SW 15 | SW 15 | SW 17 | SW 16 | SW 15 | SW 14 | SSW 14 | SSW 17 | SW 16 | SW 15 | SW 14 | SW 13 | SW 13 | SW 12 |
242 | 1366 | 992 | 1643 | 1532 | 1306 | 1140 | 869 | 1433 | 1018 | 496 | 297 | 236 | 522 | 1018 | 1341 | 890 | 501 | 418 | 181 | |
Swell 2 Height (m) Direction Period (s) | — | SW 20 | SW 18 | — | — | SSW 24 | SSW 21 | SSW 19 | — | — | — | SW 20 | SW 19 | SSW 13 | — | — | — | — | — | SW 16 |
— | 136 | 455 | — | — | 54 | 302 | 465 | — | — | — | 15 | 57 | 219 | — | — | — | — | — | 65 | |
Swell 3 Height (m) Direction Period (s) | — | SW 19 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | SW 25 |
— | 130 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 25 | |
Wind waves Height (m) Direction Period (s) | SW 16 | — | — | — | — | — | — | — | — | — | — | — | NW 3 | W 4 | SW 5 | SW 6 | — | — | NNW 2 | NE 2 |
1317 | — | — | — | — | — | — | — | — | — | — | — | 3 | 3 | 27 | 26 | — | — | 1 | 1 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 546 | 59 | 14 | 159 | 14 | 14 | 13 | 0 | 0 | 14 | 0 | 0 | 14 | 13 | 13 | 13 | 11 | 0 | 14 | 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.











